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768ae309a9
This removes the 'write' and 'force' from get_user_pages() and replaces them with 'gup_flags' to make the use of FOLL_FORCE explicit in callers as use of this flag can result in surprising behaviour (and hence bugs) within the mm subsystem. Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Acked-by: Christian König <christian.koenig@amd.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2455 lines
77 KiB
C
2455 lines
77 KiB
C
#ifndef _LINUX_MM_H
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#define _LINUX_MM_H
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#include <linux/errno.h>
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#ifdef __KERNEL__
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#include <linux/mmdebug.h>
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#include <linux/gfp.h>
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#include <linux/bug.h>
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#include <linux/list.h>
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#include <linux/mmzone.h>
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#include <linux/rbtree.h>
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#include <linux/atomic.h>
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#include <linux/debug_locks.h>
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#include <linux/mm_types.h>
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#include <linux/range.h>
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#include <linux/pfn.h>
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#include <linux/percpu-refcount.h>
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#include <linux/bit_spinlock.h>
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#include <linux/shrinker.h>
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#include <linux/resource.h>
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#include <linux/page_ext.h>
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#include <linux/err.h>
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#include <linux/page_ref.h>
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struct mempolicy;
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struct anon_vma;
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struct anon_vma_chain;
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struct file_ra_state;
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struct user_struct;
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struct writeback_control;
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struct bdi_writeback;
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#ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */
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extern unsigned long max_mapnr;
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static inline void set_max_mapnr(unsigned long limit)
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{
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max_mapnr = limit;
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}
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#else
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static inline void set_max_mapnr(unsigned long limit) { }
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#endif
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extern unsigned long totalram_pages;
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extern void * high_memory;
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extern int page_cluster;
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#ifdef CONFIG_SYSCTL
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extern int sysctl_legacy_va_layout;
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#else
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#define sysctl_legacy_va_layout 0
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#endif
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#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
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extern const int mmap_rnd_bits_min;
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extern const int mmap_rnd_bits_max;
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extern int mmap_rnd_bits __read_mostly;
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#endif
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#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
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extern const int mmap_rnd_compat_bits_min;
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extern const int mmap_rnd_compat_bits_max;
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extern int mmap_rnd_compat_bits __read_mostly;
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#endif
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#ifndef __pa_symbol
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#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
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#endif
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#ifndef page_to_virt
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#define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
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#endif
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/*
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* To prevent common memory management code establishing
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* a zero page mapping on a read fault.
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* This macro should be defined within <asm/pgtable.h>.
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* s390 does this to prevent multiplexing of hardware bits
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* related to the physical page in case of virtualization.
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*/
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#ifndef mm_forbids_zeropage
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#define mm_forbids_zeropage(X) (0)
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#endif
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/*
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* Default maximum number of active map areas, this limits the number of vmas
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* per mm struct. Users can overwrite this number by sysctl but there is a
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* problem.
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*
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* When a program's coredump is generated as ELF format, a section is created
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* per a vma. In ELF, the number of sections is represented in unsigned short.
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* This means the number of sections should be smaller than 65535 at coredump.
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* Because the kernel adds some informative sections to a image of program at
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* generating coredump, we need some margin. The number of extra sections is
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* 1-3 now and depends on arch. We use "5" as safe margin, here.
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*
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* ELF extended numbering allows more than 65535 sections, so 16-bit bound is
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* not a hard limit any more. Although some userspace tools can be surprised by
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* that.
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*/
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#define MAPCOUNT_ELF_CORE_MARGIN (5)
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#define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
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extern int sysctl_max_map_count;
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extern unsigned long sysctl_user_reserve_kbytes;
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extern unsigned long sysctl_admin_reserve_kbytes;
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extern int sysctl_overcommit_memory;
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extern int sysctl_overcommit_ratio;
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extern unsigned long sysctl_overcommit_kbytes;
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extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *,
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size_t *, loff_t *);
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extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
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size_t *, loff_t *);
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#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
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/* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
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#define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
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/*
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* Linux kernel virtual memory manager primitives.
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* The idea being to have a "virtual" mm in the same way
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* we have a virtual fs - giving a cleaner interface to the
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* mm details, and allowing different kinds of memory mappings
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* (from shared memory to executable loading to arbitrary
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* mmap() functions).
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*/
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extern struct kmem_cache *vm_area_cachep;
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#ifndef CONFIG_MMU
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extern struct rb_root nommu_region_tree;
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extern struct rw_semaphore nommu_region_sem;
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extern unsigned int kobjsize(const void *objp);
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#endif
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/*
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* vm_flags in vm_area_struct, see mm_types.h.
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* When changing, update also include/trace/events/mmflags.h
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*/
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#define VM_NONE 0x00000000
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#define VM_READ 0x00000001 /* currently active flags */
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#define VM_WRITE 0x00000002
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#define VM_EXEC 0x00000004
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#define VM_SHARED 0x00000008
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/* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
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#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
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#define VM_MAYWRITE 0x00000020
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#define VM_MAYEXEC 0x00000040
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#define VM_MAYSHARE 0x00000080
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#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
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#define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */
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#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
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#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
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#define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */
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#define VM_LOCKED 0x00002000
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#define VM_IO 0x00004000 /* Memory mapped I/O or similar */
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/* Used by sys_madvise() */
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#define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
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#define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
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#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
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#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
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#define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */
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#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
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#define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
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#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
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#define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
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#define VM_ARCH_2 0x02000000
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#define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
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#ifdef CONFIG_MEM_SOFT_DIRTY
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# define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */
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#else
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# define VM_SOFTDIRTY 0
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#endif
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#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
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#define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */
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#define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
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#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
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#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
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#define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */
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#define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */
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#define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
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#define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
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#define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
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#define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
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#define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
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#define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
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#endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
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#if defined(CONFIG_X86)
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# define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
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#if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS)
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# define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0
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# define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */
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# define VM_PKEY_BIT1 VM_HIGH_ARCH_1
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# define VM_PKEY_BIT2 VM_HIGH_ARCH_2
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# define VM_PKEY_BIT3 VM_HIGH_ARCH_3
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#endif
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#elif defined(CONFIG_PPC)
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# define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
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#elif defined(CONFIG_PARISC)
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# define VM_GROWSUP VM_ARCH_1
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#elif defined(CONFIG_METAG)
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# define VM_GROWSUP VM_ARCH_1
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#elif defined(CONFIG_IA64)
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# define VM_GROWSUP VM_ARCH_1
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#elif !defined(CONFIG_MMU)
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# define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */
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#endif
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#if defined(CONFIG_X86)
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/* MPX specific bounds table or bounds directory */
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# define VM_MPX VM_ARCH_2
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#endif
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#ifndef VM_GROWSUP
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# define VM_GROWSUP VM_NONE
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#endif
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/* Bits set in the VMA until the stack is in its final location */
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#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
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#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
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#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
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#endif
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#ifdef CONFIG_STACK_GROWSUP
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#define VM_STACK VM_GROWSUP
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#else
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#define VM_STACK VM_GROWSDOWN
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#endif
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#define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
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/*
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* Special vmas that are non-mergable, non-mlock()able.
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* Note: mm/huge_memory.c VM_NO_THP depends on this definition.
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*/
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#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP)
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/* This mask defines which mm->def_flags a process can inherit its parent */
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#define VM_INIT_DEF_MASK VM_NOHUGEPAGE
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/* This mask is used to clear all the VMA flags used by mlock */
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#define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT))
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/*
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* mapping from the currently active vm_flags protection bits (the
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* low four bits) to a page protection mask..
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*/
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extern pgprot_t protection_map[16];
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#define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
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#define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */
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#define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */
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#define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */
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#define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */
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#define FAULT_FLAG_TRIED 0x20 /* Second try */
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#define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */
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#define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */
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#define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */
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/*
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* vm_fault is filled by the the pagefault handler and passed to the vma's
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* ->fault function. The vma's ->fault is responsible for returning a bitmask
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* of VM_FAULT_xxx flags that give details about how the fault was handled.
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*
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* MM layer fills up gfp_mask for page allocations but fault handler might
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* alter it if its implementation requires a different allocation context.
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*
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* pgoff should be used in favour of virtual_address, if possible.
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*/
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struct vm_fault {
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unsigned int flags; /* FAULT_FLAG_xxx flags */
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gfp_t gfp_mask; /* gfp mask to be used for allocations */
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pgoff_t pgoff; /* Logical page offset based on vma */
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void __user *virtual_address; /* Faulting virtual address */
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struct page *cow_page; /* Handler may choose to COW */
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struct page *page; /* ->fault handlers should return a
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* page here, unless VM_FAULT_NOPAGE
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* is set (which is also implied by
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* VM_FAULT_ERROR).
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*/
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void *entry; /* ->fault handler can alternatively
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* return locked DAX entry. In that
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* case handler should return
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* VM_FAULT_DAX_LOCKED and fill in
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* entry here.
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*/
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};
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/*
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* Page fault context: passes though page fault handler instead of endless list
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* of function arguments.
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*/
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struct fault_env {
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struct vm_area_struct *vma; /* Target VMA */
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unsigned long address; /* Faulting virtual address */
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unsigned int flags; /* FAULT_FLAG_xxx flags */
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pmd_t *pmd; /* Pointer to pmd entry matching
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* the 'address'
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*/
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pte_t *pte; /* Pointer to pte entry matching
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* the 'address'. NULL if the page
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* table hasn't been allocated.
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*/
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spinlock_t *ptl; /* Page table lock.
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* Protects pte page table if 'pte'
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* is not NULL, otherwise pmd.
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*/
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pgtable_t prealloc_pte; /* Pre-allocated pte page table.
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* vm_ops->map_pages() calls
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* alloc_set_pte() from atomic context.
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* do_fault_around() pre-allocates
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* page table to avoid allocation from
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* atomic context.
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*/
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};
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/*
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* These are the virtual MM functions - opening of an area, closing and
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* unmapping it (needed to keep files on disk up-to-date etc), pointer
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* to the functions called when a no-page or a wp-page exception occurs.
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*/
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struct vm_operations_struct {
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void (*open)(struct vm_area_struct * area);
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void (*close)(struct vm_area_struct * area);
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int (*mremap)(struct vm_area_struct * area);
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int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
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int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
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pmd_t *, unsigned int flags);
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void (*map_pages)(struct fault_env *fe,
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pgoff_t start_pgoff, pgoff_t end_pgoff);
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/* notification that a previously read-only page is about to become
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* writable, if an error is returned it will cause a SIGBUS */
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int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
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/* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */
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int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
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/* called by access_process_vm when get_user_pages() fails, typically
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* for use by special VMAs that can switch between memory and hardware
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*/
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int (*access)(struct vm_area_struct *vma, unsigned long addr,
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void *buf, int len, int write);
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/* Called by the /proc/PID/maps code to ask the vma whether it
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* has a special name. Returning non-NULL will also cause this
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* vma to be dumped unconditionally. */
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const char *(*name)(struct vm_area_struct *vma);
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#ifdef CONFIG_NUMA
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/*
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* set_policy() op must add a reference to any non-NULL @new mempolicy
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* to hold the policy upon return. Caller should pass NULL @new to
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* remove a policy and fall back to surrounding context--i.e. do not
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* install a MPOL_DEFAULT policy, nor the task or system default
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* mempolicy.
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*/
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int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
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/*
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* get_policy() op must add reference [mpol_get()] to any policy at
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* (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
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* in mm/mempolicy.c will do this automatically.
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* get_policy() must NOT add a ref if the policy at (vma,addr) is not
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* marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
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* If no [shared/vma] mempolicy exists at the addr, get_policy() op
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* must return NULL--i.e., do not "fallback" to task or system default
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* policy.
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*/
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struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
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unsigned long addr);
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#endif
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/*
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* Called by vm_normal_page() for special PTEs to find the
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* page for @addr. This is useful if the default behavior
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* (using pte_page()) would not find the correct page.
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*/
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struct page *(*find_special_page)(struct vm_area_struct *vma,
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unsigned long addr);
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};
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struct mmu_gather;
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struct inode;
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#define page_private(page) ((page)->private)
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#define set_page_private(page, v) ((page)->private = (v))
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#if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
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static inline int pmd_devmap(pmd_t pmd)
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{
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return 0;
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}
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#endif
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/*
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* FIXME: take this include out, include page-flags.h in
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* files which need it (119 of them)
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*/
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#include <linux/page-flags.h>
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#include <linux/huge_mm.h>
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/*
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* Methods to modify the page usage count.
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*
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* What counts for a page usage:
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* - cache mapping (page->mapping)
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* - private data (page->private)
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* - page mapped in a task's page tables, each mapping
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* is counted separately
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*
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* Also, many kernel routines increase the page count before a critical
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* routine so they can be sure the page doesn't go away from under them.
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*/
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/*
|
|
* Drop a ref, return true if the refcount fell to zero (the page has no users)
|
|
*/
|
|
static inline int put_page_testzero(struct page *page)
|
|
{
|
|
VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
|
|
return page_ref_dec_and_test(page);
|
|
}
|
|
|
|
/*
|
|
* Try to grab a ref unless the page has a refcount of zero, return false if
|
|
* that is the case.
|
|
* This can be called when MMU is off so it must not access
|
|
* any of the virtual mappings.
|
|
*/
|
|
static inline int get_page_unless_zero(struct page *page)
|
|
{
|
|
return page_ref_add_unless(page, 1, 0);
|
|
}
|
|
|
|
extern int page_is_ram(unsigned long pfn);
|
|
|
|
enum {
|
|
REGION_INTERSECTS,
|
|
REGION_DISJOINT,
|
|
REGION_MIXED,
|
|
};
|
|
|
|
int region_intersects(resource_size_t offset, size_t size, unsigned long flags,
|
|
unsigned long desc);
|
|
|
|
/* Support for virtually mapped pages */
|
|
struct page *vmalloc_to_page(const void *addr);
|
|
unsigned long vmalloc_to_pfn(const void *addr);
|
|
|
|
/*
|
|
* Determine if an address is within the vmalloc range
|
|
*
|
|
* On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
|
|
* is no special casing required.
|
|
*/
|
|
static inline bool is_vmalloc_addr(const void *x)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
unsigned long addr = (unsigned long)x;
|
|
|
|
return addr >= VMALLOC_START && addr < VMALLOC_END;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
#ifdef CONFIG_MMU
|
|
extern int is_vmalloc_or_module_addr(const void *x);
|
|
#else
|
|
static inline int is_vmalloc_or_module_addr(const void *x)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
extern void kvfree(const void *addr);
|
|
|
|
static inline atomic_t *compound_mapcount_ptr(struct page *page)
|
|
{
|
|
return &page[1].compound_mapcount;
|
|
}
|
|
|
|
static inline int compound_mapcount(struct page *page)
|
|
{
|
|
VM_BUG_ON_PAGE(!PageCompound(page), page);
|
|
page = compound_head(page);
|
|
return atomic_read(compound_mapcount_ptr(page)) + 1;
|
|
}
|
|
|
|
/*
|
|
* The atomic page->_mapcount, starts from -1: so that transitions
|
|
* both from it and to it can be tracked, using atomic_inc_and_test
|
|
* and atomic_add_negative(-1).
|
|
*/
|
|
static inline void page_mapcount_reset(struct page *page)
|
|
{
|
|
atomic_set(&(page)->_mapcount, -1);
|
|
}
|
|
|
|
int __page_mapcount(struct page *page);
|
|
|
|
static inline int page_mapcount(struct page *page)
|
|
{
|
|
VM_BUG_ON_PAGE(PageSlab(page), page);
|
|
|
|
if (unlikely(PageCompound(page)))
|
|
return __page_mapcount(page);
|
|
return atomic_read(&page->_mapcount) + 1;
|
|
}
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
int total_mapcount(struct page *page);
|
|
int page_trans_huge_mapcount(struct page *page, int *total_mapcount);
|
|
#else
|
|
static inline int total_mapcount(struct page *page)
|
|
{
|
|
return page_mapcount(page);
|
|
}
|
|
static inline int page_trans_huge_mapcount(struct page *page,
|
|
int *total_mapcount)
|
|
{
|
|
int mapcount = page_mapcount(page);
|
|
if (total_mapcount)
|
|
*total_mapcount = mapcount;
|
|
return mapcount;
|
|
}
|
|
#endif
|
|
|
|
static inline struct page *virt_to_head_page(const void *x)
|
|
{
|
|
struct page *page = virt_to_page(x);
|
|
|
|
return compound_head(page);
|
|
}
|
|
|
|
void __put_page(struct page *page);
|
|
|
|
void put_pages_list(struct list_head *pages);
|
|
|
|
void split_page(struct page *page, unsigned int order);
|
|
|
|
/*
|
|
* Compound pages have a destructor function. Provide a
|
|
* prototype for that function and accessor functions.
|
|
* These are _only_ valid on the head of a compound page.
|
|
*/
|
|
typedef void compound_page_dtor(struct page *);
|
|
|
|
/* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
|
|
enum compound_dtor_id {
|
|
NULL_COMPOUND_DTOR,
|
|
COMPOUND_PAGE_DTOR,
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
HUGETLB_PAGE_DTOR,
|
|
#endif
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
TRANSHUGE_PAGE_DTOR,
|
|
#endif
|
|
NR_COMPOUND_DTORS,
|
|
};
|
|
extern compound_page_dtor * const compound_page_dtors[];
|
|
|
|
static inline void set_compound_page_dtor(struct page *page,
|
|
enum compound_dtor_id compound_dtor)
|
|
{
|
|
VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page);
|
|
page[1].compound_dtor = compound_dtor;
|
|
}
|
|
|
|
static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
|
|
{
|
|
VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
|
|
return compound_page_dtors[page[1].compound_dtor];
|
|
}
|
|
|
|
static inline unsigned int compound_order(struct page *page)
|
|
{
|
|
if (!PageHead(page))
|
|
return 0;
|
|
return page[1].compound_order;
|
|
}
|
|
|
|
static inline void set_compound_order(struct page *page, unsigned int order)
|
|
{
|
|
page[1].compound_order = order;
|
|
}
|
|
|
|
void free_compound_page(struct page *page);
|
|
|
|
#ifdef CONFIG_MMU
|
|
/*
|
|
* Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when
|
|
* servicing faults for write access. In the normal case, do always want
|
|
* pte_mkwrite. But get_user_pages can cause write faults for mappings
|
|
* that do not have writing enabled, when used by access_process_vm.
|
|
*/
|
|
static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
|
|
{
|
|
if (likely(vma->vm_flags & VM_WRITE))
|
|
pte = pte_mkwrite(pte);
|
|
return pte;
|
|
}
|
|
|
|
int alloc_set_pte(struct fault_env *fe, struct mem_cgroup *memcg,
|
|
struct page *page);
|
|
#endif
|
|
|
|
/*
|
|
* Multiple processes may "see" the same page. E.g. for untouched
|
|
* mappings of /dev/null, all processes see the same page full of
|
|
* zeroes, and text pages of executables and shared libraries have
|
|
* only one copy in memory, at most, normally.
|
|
*
|
|
* For the non-reserved pages, page_count(page) denotes a reference count.
|
|
* page_count() == 0 means the page is free. page->lru is then used for
|
|
* freelist management in the buddy allocator.
|
|
* page_count() > 0 means the page has been allocated.
|
|
*
|
|
* Pages are allocated by the slab allocator in order to provide memory
|
|
* to kmalloc and kmem_cache_alloc. In this case, the management of the
|
|
* page, and the fields in 'struct page' are the responsibility of mm/slab.c
|
|
* unless a particular usage is carefully commented. (the responsibility of
|
|
* freeing the kmalloc memory is the caller's, of course).
|
|
*
|
|
* A page may be used by anyone else who does a __get_free_page().
|
|
* In this case, page_count still tracks the references, and should only
|
|
* be used through the normal accessor functions. The top bits of page->flags
|
|
* and page->virtual store page management information, but all other fields
|
|
* are unused and could be used privately, carefully. The management of this
|
|
* page is the responsibility of the one who allocated it, and those who have
|
|
* subsequently been given references to it.
|
|
*
|
|
* The other pages (we may call them "pagecache pages") are completely
|
|
* managed by the Linux memory manager: I/O, buffers, swapping etc.
|
|
* The following discussion applies only to them.
|
|
*
|
|
* A pagecache page contains an opaque `private' member, which belongs to the
|
|
* page's address_space. Usually, this is the address of a circular list of
|
|
* the page's disk buffers. PG_private must be set to tell the VM to call
|
|
* into the filesystem to release these pages.
|
|
*
|
|
* A page may belong to an inode's memory mapping. In this case, page->mapping
|
|
* is the pointer to the inode, and page->index is the file offset of the page,
|
|
* in units of PAGE_SIZE.
|
|
*
|
|
* If pagecache pages are not associated with an inode, they are said to be
|
|
* anonymous pages. These may become associated with the swapcache, and in that
|
|
* case PG_swapcache is set, and page->private is an offset into the swapcache.
|
|
*
|
|
* In either case (swapcache or inode backed), the pagecache itself holds one
|
|
* reference to the page. Setting PG_private should also increment the
|
|
* refcount. The each user mapping also has a reference to the page.
|
|
*
|
|
* The pagecache pages are stored in a per-mapping radix tree, which is
|
|
* rooted at mapping->page_tree, and indexed by offset.
|
|
* Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
|
|
* lists, we instead now tag pages as dirty/writeback in the radix tree.
|
|
*
|
|
* All pagecache pages may be subject to I/O:
|
|
* - inode pages may need to be read from disk,
|
|
* - inode pages which have been modified and are MAP_SHARED may need
|
|
* to be written back to the inode on disk,
|
|
* - anonymous pages (including MAP_PRIVATE file mappings) which have been
|
|
* modified may need to be swapped out to swap space and (later) to be read
|
|
* back into memory.
|
|
*/
|
|
|
|
/*
|
|
* The zone field is never updated after free_area_init_core()
|
|
* sets it, so none of the operations on it need to be atomic.
|
|
*/
|
|
|
|
/* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */
|
|
#define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
|
|
#define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
|
|
#define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
|
|
#define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH)
|
|
|
|
/*
|
|
* Define the bit shifts to access each section. For non-existent
|
|
* sections we define the shift as 0; that plus a 0 mask ensures
|
|
* the compiler will optimise away reference to them.
|
|
*/
|
|
#define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
|
|
#define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
|
|
#define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
|
|
#define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0))
|
|
|
|
/* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
|
|
#ifdef NODE_NOT_IN_PAGE_FLAGS
|
|
#define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
|
|
#define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
|
|
SECTIONS_PGOFF : ZONES_PGOFF)
|
|
#else
|
|
#define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
|
|
#define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
|
|
NODES_PGOFF : ZONES_PGOFF)
|
|
#endif
|
|
|
|
#define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
|
|
|
|
#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
|
|
#error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
|
|
#endif
|
|
|
|
#define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
|
|
#define NODES_MASK ((1UL << NODES_WIDTH) - 1)
|
|
#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
|
|
#define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1)
|
|
#define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
|
|
|
|
static inline enum zone_type page_zonenum(const struct page *page)
|
|
{
|
|
return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
|
|
}
|
|
|
|
#ifdef CONFIG_ZONE_DEVICE
|
|
void get_zone_device_page(struct page *page);
|
|
void put_zone_device_page(struct page *page);
|
|
static inline bool is_zone_device_page(const struct page *page)
|
|
{
|
|
return page_zonenum(page) == ZONE_DEVICE;
|
|
}
|
|
#else
|
|
static inline void get_zone_device_page(struct page *page)
|
|
{
|
|
}
|
|
static inline void put_zone_device_page(struct page *page)
|
|
{
|
|
}
|
|
static inline bool is_zone_device_page(const struct page *page)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static inline void get_page(struct page *page)
|
|
{
|
|
page = compound_head(page);
|
|
/*
|
|
* Getting a normal page or the head of a compound page
|
|
* requires to already have an elevated page->_refcount.
|
|
*/
|
|
VM_BUG_ON_PAGE(page_ref_count(page) <= 0, page);
|
|
page_ref_inc(page);
|
|
|
|
if (unlikely(is_zone_device_page(page)))
|
|
get_zone_device_page(page);
|
|
}
|
|
|
|
static inline void put_page(struct page *page)
|
|
{
|
|
page = compound_head(page);
|
|
|
|
if (put_page_testzero(page))
|
|
__put_page(page);
|
|
|
|
if (unlikely(is_zone_device_page(page)))
|
|
put_zone_device_page(page);
|
|
}
|
|
|
|
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
|
|
#define SECTION_IN_PAGE_FLAGS
|
|
#endif
|
|
|
|
/*
|
|
* The identification function is mainly used by the buddy allocator for
|
|
* determining if two pages could be buddies. We are not really identifying
|
|
* the zone since we could be using the section number id if we do not have
|
|
* node id available in page flags.
|
|
* We only guarantee that it will return the same value for two combinable
|
|
* pages in a zone.
|
|
*/
|
|
static inline int page_zone_id(struct page *page)
|
|
{
|
|
return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
|
|
}
|
|
|
|
static inline int zone_to_nid(struct zone *zone)
|
|
{
|
|
#ifdef CONFIG_NUMA
|
|
return zone->node;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
#ifdef NODE_NOT_IN_PAGE_FLAGS
|
|
extern int page_to_nid(const struct page *page);
|
|
#else
|
|
static inline int page_to_nid(const struct page *page)
|
|
{
|
|
return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
static inline int cpu_pid_to_cpupid(int cpu, int pid)
|
|
{
|
|
return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK);
|
|
}
|
|
|
|
static inline int cpupid_to_pid(int cpupid)
|
|
{
|
|
return cpupid & LAST__PID_MASK;
|
|
}
|
|
|
|
static inline int cpupid_to_cpu(int cpupid)
|
|
{
|
|
return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK;
|
|
}
|
|
|
|
static inline int cpupid_to_nid(int cpupid)
|
|
{
|
|
return cpu_to_node(cpupid_to_cpu(cpupid));
|
|
}
|
|
|
|
static inline bool cpupid_pid_unset(int cpupid)
|
|
{
|
|
return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK);
|
|
}
|
|
|
|
static inline bool cpupid_cpu_unset(int cpupid)
|
|
{
|
|
return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK);
|
|
}
|
|
|
|
static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid)
|
|
{
|
|
return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid);
|
|
}
|
|
|
|
#define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid)
|
|
#ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
|
|
static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
|
|
{
|
|
return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK);
|
|
}
|
|
|
|
static inline int page_cpupid_last(struct page *page)
|
|
{
|
|
return page->_last_cpupid;
|
|
}
|
|
static inline void page_cpupid_reset_last(struct page *page)
|
|
{
|
|
page->_last_cpupid = -1 & LAST_CPUPID_MASK;
|
|
}
|
|
#else
|
|
static inline int page_cpupid_last(struct page *page)
|
|
{
|
|
return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK;
|
|
}
|
|
|
|
extern int page_cpupid_xchg_last(struct page *page, int cpupid);
|
|
|
|
static inline void page_cpupid_reset_last(struct page *page)
|
|
{
|
|
page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT;
|
|
}
|
|
#endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
|
|
#else /* !CONFIG_NUMA_BALANCING */
|
|
static inline int page_cpupid_xchg_last(struct page *page, int cpupid)
|
|
{
|
|
return page_to_nid(page); /* XXX */
|
|
}
|
|
|
|
static inline int page_cpupid_last(struct page *page)
|
|
{
|
|
return page_to_nid(page); /* XXX */
|
|
}
|
|
|
|
static inline int cpupid_to_nid(int cpupid)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static inline int cpupid_to_pid(int cpupid)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static inline int cpupid_to_cpu(int cpupid)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static inline int cpu_pid_to_cpupid(int nid, int pid)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static inline bool cpupid_pid_unset(int cpupid)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline void page_cpupid_reset_last(struct page *page)
|
|
{
|
|
}
|
|
|
|
static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
|
|
static inline struct zone *page_zone(const struct page *page)
|
|
{
|
|
return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
|
|
}
|
|
|
|
static inline pg_data_t *page_pgdat(const struct page *page)
|
|
{
|
|
return NODE_DATA(page_to_nid(page));
|
|
}
|
|
|
|
#ifdef SECTION_IN_PAGE_FLAGS
|
|
static inline void set_page_section(struct page *page, unsigned long section)
|
|
{
|
|
page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
|
|
page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
|
|
}
|
|
|
|
static inline unsigned long page_to_section(const struct page *page)
|
|
{
|
|
return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
|
|
}
|
|
#endif
|
|
|
|
static inline void set_page_zone(struct page *page, enum zone_type zone)
|
|
{
|
|
page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
|
|
page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
|
|
}
|
|
|
|
static inline void set_page_node(struct page *page, unsigned long node)
|
|
{
|
|
page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
|
|
page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
|
|
}
|
|
|
|
static inline void set_page_links(struct page *page, enum zone_type zone,
|
|
unsigned long node, unsigned long pfn)
|
|
{
|
|
set_page_zone(page, zone);
|
|
set_page_node(page, node);
|
|
#ifdef SECTION_IN_PAGE_FLAGS
|
|
set_page_section(page, pfn_to_section_nr(pfn));
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_MEMCG
|
|
static inline struct mem_cgroup *page_memcg(struct page *page)
|
|
{
|
|
return page->mem_cgroup;
|
|
}
|
|
static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
|
|
{
|
|
WARN_ON_ONCE(!rcu_read_lock_held());
|
|
return READ_ONCE(page->mem_cgroup);
|
|
}
|
|
#else
|
|
static inline struct mem_cgroup *page_memcg(struct page *page)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
|
|
{
|
|
WARN_ON_ONCE(!rcu_read_lock_held());
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Some inline functions in vmstat.h depend on page_zone()
|
|
*/
|
|
#include <linux/vmstat.h>
|
|
|
|
static __always_inline void *lowmem_page_address(const struct page *page)
|
|
{
|
|
return page_to_virt(page);
|
|
}
|
|
|
|
#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
|
|
#define HASHED_PAGE_VIRTUAL
|
|
#endif
|
|
|
|
#if defined(WANT_PAGE_VIRTUAL)
|
|
static inline void *page_address(const struct page *page)
|
|
{
|
|
return page->virtual;
|
|
}
|
|
static inline void set_page_address(struct page *page, void *address)
|
|
{
|
|
page->virtual = address;
|
|
}
|
|
#define page_address_init() do { } while(0)
|
|
#endif
|
|
|
|
#if defined(HASHED_PAGE_VIRTUAL)
|
|
void *page_address(const struct page *page);
|
|
void set_page_address(struct page *page, void *virtual);
|
|
void page_address_init(void);
|
|
#endif
|
|
|
|
#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
|
|
#define page_address(page) lowmem_page_address(page)
|
|
#define set_page_address(page, address) do { } while(0)
|
|
#define page_address_init() do { } while(0)
|
|
#endif
|
|
|
|
extern void *page_rmapping(struct page *page);
|
|
extern struct anon_vma *page_anon_vma(struct page *page);
|
|
extern struct address_space *page_mapping(struct page *page);
|
|
|
|
extern struct address_space *__page_file_mapping(struct page *);
|
|
|
|
static inline
|
|
struct address_space *page_file_mapping(struct page *page)
|
|
{
|
|
if (unlikely(PageSwapCache(page)))
|
|
return __page_file_mapping(page);
|
|
|
|
return page->mapping;
|
|
}
|
|
|
|
extern pgoff_t __page_file_index(struct page *page);
|
|
|
|
/*
|
|
* Return the pagecache index of the passed page. Regular pagecache pages
|
|
* use ->index whereas swapcache pages use swp_offset(->private)
|
|
*/
|
|
static inline pgoff_t page_index(struct page *page)
|
|
{
|
|
if (unlikely(PageSwapCache(page)))
|
|
return __page_file_index(page);
|
|
return page->index;
|
|
}
|
|
|
|
bool page_mapped(struct page *page);
|
|
struct address_space *page_mapping(struct page *page);
|
|
|
|
/*
|
|
* Return true only if the page has been allocated with
|
|
* ALLOC_NO_WATERMARKS and the low watermark was not
|
|
* met implying that the system is under some pressure.
|
|
*/
|
|
static inline bool page_is_pfmemalloc(struct page *page)
|
|
{
|
|
/*
|
|
* Page index cannot be this large so this must be
|
|
* a pfmemalloc page.
|
|
*/
|
|
return page->index == -1UL;
|
|
}
|
|
|
|
/*
|
|
* Only to be called by the page allocator on a freshly allocated
|
|
* page.
|
|
*/
|
|
static inline void set_page_pfmemalloc(struct page *page)
|
|
{
|
|
page->index = -1UL;
|
|
}
|
|
|
|
static inline void clear_page_pfmemalloc(struct page *page)
|
|
{
|
|
page->index = 0;
|
|
}
|
|
|
|
/*
|
|
* Different kinds of faults, as returned by handle_mm_fault().
|
|
* Used to decide whether a process gets delivered SIGBUS or
|
|
* just gets major/minor fault counters bumped up.
|
|
*/
|
|
|
|
#define VM_FAULT_OOM 0x0001
|
|
#define VM_FAULT_SIGBUS 0x0002
|
|
#define VM_FAULT_MAJOR 0x0004
|
|
#define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
|
|
#define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */
|
|
#define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */
|
|
#define VM_FAULT_SIGSEGV 0x0040
|
|
|
|
#define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
|
|
#define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
|
|
#define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */
|
|
#define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */
|
|
#define VM_FAULT_DAX_LOCKED 0x1000 /* ->fault has locked DAX entry */
|
|
|
|
#define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
|
|
|
|
#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
|
|
VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
|
|
VM_FAULT_FALLBACK)
|
|
|
|
/* Encode hstate index for a hwpoisoned large page */
|
|
#define VM_FAULT_SET_HINDEX(x) ((x) << 12)
|
|
#define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
|
|
|
|
/*
|
|
* Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
|
|
*/
|
|
extern void pagefault_out_of_memory(void);
|
|
|
|
#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
|
|
|
|
/*
|
|
* Flags passed to show_mem() and show_free_areas() to suppress output in
|
|
* various contexts.
|
|
*/
|
|
#define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
|
|
|
|
extern void show_free_areas(unsigned int flags);
|
|
extern bool skip_free_areas_node(unsigned int flags, int nid);
|
|
|
|
int shmem_zero_setup(struct vm_area_struct *);
|
|
#ifdef CONFIG_SHMEM
|
|
bool shmem_mapping(struct address_space *mapping);
|
|
#else
|
|
static inline bool shmem_mapping(struct address_space *mapping)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
extern bool can_do_mlock(void);
|
|
extern int user_shm_lock(size_t, struct user_struct *);
|
|
extern void user_shm_unlock(size_t, struct user_struct *);
|
|
|
|
/*
|
|
* Parameter block passed down to zap_pte_range in exceptional cases.
|
|
*/
|
|
struct zap_details {
|
|
struct address_space *check_mapping; /* Check page->mapping if set */
|
|
pgoff_t first_index; /* Lowest page->index to unmap */
|
|
pgoff_t last_index; /* Highest page->index to unmap */
|
|
bool ignore_dirty; /* Ignore dirty pages */
|
|
bool check_swap_entries; /* Check also swap entries */
|
|
};
|
|
|
|
struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
|
|
pte_t pte);
|
|
struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
|
|
pmd_t pmd);
|
|
|
|
int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
|
|
unsigned long size);
|
|
void zap_page_range(struct vm_area_struct *vma, unsigned long address,
|
|
unsigned long size, struct zap_details *);
|
|
void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
|
|
unsigned long start, unsigned long end);
|
|
|
|
/**
|
|
* mm_walk - callbacks for walk_page_range
|
|
* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
|
|
* this handler is required to be able to handle
|
|
* pmd_trans_huge() pmds. They may simply choose to
|
|
* split_huge_page() instead of handling it explicitly.
|
|
* @pte_entry: if set, called for each non-empty PTE (4th-level) entry
|
|
* @pte_hole: if set, called for each hole at all levels
|
|
* @hugetlb_entry: if set, called for each hugetlb entry
|
|
* @test_walk: caller specific callback function to determine whether
|
|
* we walk over the current vma or not. Returning 0
|
|
* value means "do page table walk over the current vma,"
|
|
* and a negative one means "abort current page table walk
|
|
* right now." 1 means "skip the current vma."
|
|
* @mm: mm_struct representing the target process of page table walk
|
|
* @vma: vma currently walked (NULL if walking outside vmas)
|
|
* @private: private data for callbacks' usage
|
|
*
|
|
* (see the comment on walk_page_range() for more details)
|
|
*/
|
|
struct mm_walk {
|
|
int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
|
|
unsigned long next, struct mm_walk *walk);
|
|
int (*pte_entry)(pte_t *pte, unsigned long addr,
|
|
unsigned long next, struct mm_walk *walk);
|
|
int (*pte_hole)(unsigned long addr, unsigned long next,
|
|
struct mm_walk *walk);
|
|
int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
|
|
unsigned long addr, unsigned long next,
|
|
struct mm_walk *walk);
|
|
int (*test_walk)(unsigned long addr, unsigned long next,
|
|
struct mm_walk *walk);
|
|
struct mm_struct *mm;
|
|
struct vm_area_struct *vma;
|
|
void *private;
|
|
};
|
|
|
|
int walk_page_range(unsigned long addr, unsigned long end,
|
|
struct mm_walk *walk);
|
|
int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
|
|
void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
|
|
unsigned long end, unsigned long floor, unsigned long ceiling);
|
|
int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
|
|
struct vm_area_struct *vma);
|
|
void unmap_mapping_range(struct address_space *mapping,
|
|
loff_t const holebegin, loff_t const holelen, int even_cows);
|
|
int follow_pfn(struct vm_area_struct *vma, unsigned long address,
|
|
unsigned long *pfn);
|
|
int follow_phys(struct vm_area_struct *vma, unsigned long address,
|
|
unsigned int flags, unsigned long *prot, resource_size_t *phys);
|
|
int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
|
|
void *buf, int len, int write);
|
|
|
|
static inline void unmap_shared_mapping_range(struct address_space *mapping,
|
|
loff_t const holebegin, loff_t const holelen)
|
|
{
|
|
unmap_mapping_range(mapping, holebegin, holelen, 0);
|
|
}
|
|
|
|
extern void truncate_pagecache(struct inode *inode, loff_t new);
|
|
extern void truncate_setsize(struct inode *inode, loff_t newsize);
|
|
void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
|
|
void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
|
|
int truncate_inode_page(struct address_space *mapping, struct page *page);
|
|
int generic_error_remove_page(struct address_space *mapping, struct page *page);
|
|
int invalidate_inode_page(struct page *page);
|
|
|
|
#ifdef CONFIG_MMU
|
|
extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
|
|
unsigned int flags);
|
|
extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
|
|
unsigned long address, unsigned int fault_flags,
|
|
bool *unlocked);
|
|
#else
|
|
static inline int handle_mm_fault(struct vm_area_struct *vma,
|
|
unsigned long address, unsigned int flags)
|
|
{
|
|
/* should never happen if there's no MMU */
|
|
BUG();
|
|
return VM_FAULT_SIGBUS;
|
|
}
|
|
static inline int fixup_user_fault(struct task_struct *tsk,
|
|
struct mm_struct *mm, unsigned long address,
|
|
unsigned int fault_flags, bool *unlocked)
|
|
{
|
|
/* should never happen if there's no MMU */
|
|
BUG();
|
|
return -EFAULT;
|
|
}
|
|
#endif
|
|
|
|
extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
|
|
extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
|
|
void *buf, int len, int write);
|
|
|
|
long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
|
|
unsigned long start, unsigned long nr_pages,
|
|
unsigned int foll_flags, struct page **pages,
|
|
struct vm_area_struct **vmas, int *nonblocking);
|
|
long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
|
|
unsigned long start, unsigned long nr_pages,
|
|
int write, int force, struct page **pages,
|
|
struct vm_area_struct **vmas);
|
|
long get_user_pages(unsigned long start, unsigned long nr_pages,
|
|
unsigned int gup_flags, struct page **pages,
|
|
struct vm_area_struct **vmas);
|
|
long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
|
|
unsigned int gup_flags, struct page **pages, int *locked);
|
|
long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
|
|
unsigned long start, unsigned long nr_pages,
|
|
struct page **pages, unsigned int gup_flags);
|
|
long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
|
|
struct page **pages, unsigned int gup_flags);
|
|
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
|
|
struct page **pages);
|
|
|
|
/* Container for pinned pfns / pages */
|
|
struct frame_vector {
|
|
unsigned int nr_allocated; /* Number of frames we have space for */
|
|
unsigned int nr_frames; /* Number of frames stored in ptrs array */
|
|
bool got_ref; /* Did we pin pages by getting page ref? */
|
|
bool is_pfns; /* Does array contain pages or pfns? */
|
|
void *ptrs[0]; /* Array of pinned pfns / pages. Use
|
|
* pfns_vector_pages() or pfns_vector_pfns()
|
|
* for access */
|
|
};
|
|
|
|
struct frame_vector *frame_vector_create(unsigned int nr_frames);
|
|
void frame_vector_destroy(struct frame_vector *vec);
|
|
int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
|
|
unsigned int gup_flags, struct frame_vector *vec);
|
|
void put_vaddr_frames(struct frame_vector *vec);
|
|
int frame_vector_to_pages(struct frame_vector *vec);
|
|
void frame_vector_to_pfns(struct frame_vector *vec);
|
|
|
|
static inline unsigned int frame_vector_count(struct frame_vector *vec)
|
|
{
|
|
return vec->nr_frames;
|
|
}
|
|
|
|
static inline struct page **frame_vector_pages(struct frame_vector *vec)
|
|
{
|
|
if (vec->is_pfns) {
|
|
int err = frame_vector_to_pages(vec);
|
|
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
}
|
|
return (struct page **)(vec->ptrs);
|
|
}
|
|
|
|
static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
|
|
{
|
|
if (!vec->is_pfns)
|
|
frame_vector_to_pfns(vec);
|
|
return (unsigned long *)(vec->ptrs);
|
|
}
|
|
|
|
struct kvec;
|
|
int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
|
|
struct page **pages);
|
|
int get_kernel_page(unsigned long start, int write, struct page **pages);
|
|
struct page *get_dump_page(unsigned long addr);
|
|
|
|
extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
|
|
extern void do_invalidatepage(struct page *page, unsigned int offset,
|
|
unsigned int length);
|
|
|
|
int __set_page_dirty_nobuffers(struct page *page);
|
|
int __set_page_dirty_no_writeback(struct page *page);
|
|
int redirty_page_for_writepage(struct writeback_control *wbc,
|
|
struct page *page);
|
|
void account_page_dirtied(struct page *page, struct address_space *mapping);
|
|
void account_page_cleaned(struct page *page, struct address_space *mapping,
|
|
struct bdi_writeback *wb);
|
|
int set_page_dirty(struct page *page);
|
|
int set_page_dirty_lock(struct page *page);
|
|
void cancel_dirty_page(struct page *page);
|
|
int clear_page_dirty_for_io(struct page *page);
|
|
|
|
int get_cmdline(struct task_struct *task, char *buffer, int buflen);
|
|
|
|
/* Is the vma a continuation of the stack vma above it? */
|
|
static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
|
|
{
|
|
return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
|
|
}
|
|
|
|
static inline bool vma_is_anonymous(struct vm_area_struct *vma)
|
|
{
|
|
return !vma->vm_ops;
|
|
}
|
|
|
|
static inline int stack_guard_page_start(struct vm_area_struct *vma,
|
|
unsigned long addr)
|
|
{
|
|
return (vma->vm_flags & VM_GROWSDOWN) &&
|
|
(vma->vm_start == addr) &&
|
|
!vma_growsdown(vma->vm_prev, addr);
|
|
}
|
|
|
|
/* Is the vma a continuation of the stack vma below it? */
|
|
static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
|
|
{
|
|
return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
|
|
}
|
|
|
|
static inline int stack_guard_page_end(struct vm_area_struct *vma,
|
|
unsigned long addr)
|
|
{
|
|
return (vma->vm_flags & VM_GROWSUP) &&
|
|
(vma->vm_end == addr) &&
|
|
!vma_growsup(vma->vm_next, addr);
|
|
}
|
|
|
|
int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t);
|
|
|
|
extern unsigned long move_page_tables(struct vm_area_struct *vma,
|
|
unsigned long old_addr, struct vm_area_struct *new_vma,
|
|
unsigned long new_addr, unsigned long len,
|
|
bool need_rmap_locks);
|
|
extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
|
|
unsigned long end, pgprot_t newprot,
|
|
int dirty_accountable, int prot_numa);
|
|
extern int mprotect_fixup(struct vm_area_struct *vma,
|
|
struct vm_area_struct **pprev, unsigned long start,
|
|
unsigned long end, unsigned long newflags);
|
|
|
|
/*
|
|
* doesn't attempt to fault and will return short.
|
|
*/
|
|
int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
|
|
struct page **pages);
|
|
/*
|
|
* per-process(per-mm_struct) statistics.
|
|
*/
|
|
static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
|
|
{
|
|
long val = atomic_long_read(&mm->rss_stat.count[member]);
|
|
|
|
#ifdef SPLIT_RSS_COUNTING
|
|
/*
|
|
* counter is updated in asynchronous manner and may go to minus.
|
|
* But it's never be expected number for users.
|
|
*/
|
|
if (val < 0)
|
|
val = 0;
|
|
#endif
|
|
return (unsigned long)val;
|
|
}
|
|
|
|
static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
|
|
{
|
|
atomic_long_add(value, &mm->rss_stat.count[member]);
|
|
}
|
|
|
|
static inline void inc_mm_counter(struct mm_struct *mm, int member)
|
|
{
|
|
atomic_long_inc(&mm->rss_stat.count[member]);
|
|
}
|
|
|
|
static inline void dec_mm_counter(struct mm_struct *mm, int member)
|
|
{
|
|
atomic_long_dec(&mm->rss_stat.count[member]);
|
|
}
|
|
|
|
/* Optimized variant when page is already known not to be PageAnon */
|
|
static inline int mm_counter_file(struct page *page)
|
|
{
|
|
if (PageSwapBacked(page))
|
|
return MM_SHMEMPAGES;
|
|
return MM_FILEPAGES;
|
|
}
|
|
|
|
static inline int mm_counter(struct page *page)
|
|
{
|
|
if (PageAnon(page))
|
|
return MM_ANONPAGES;
|
|
return mm_counter_file(page);
|
|
}
|
|
|
|
static inline unsigned long get_mm_rss(struct mm_struct *mm)
|
|
{
|
|
return get_mm_counter(mm, MM_FILEPAGES) +
|
|
get_mm_counter(mm, MM_ANONPAGES) +
|
|
get_mm_counter(mm, MM_SHMEMPAGES);
|
|
}
|
|
|
|
static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
|
|
{
|
|
return max(mm->hiwater_rss, get_mm_rss(mm));
|
|
}
|
|
|
|
static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
|
|
{
|
|
return max(mm->hiwater_vm, mm->total_vm);
|
|
}
|
|
|
|
static inline void update_hiwater_rss(struct mm_struct *mm)
|
|
{
|
|
unsigned long _rss = get_mm_rss(mm);
|
|
|
|
if ((mm)->hiwater_rss < _rss)
|
|
(mm)->hiwater_rss = _rss;
|
|
}
|
|
|
|
static inline void update_hiwater_vm(struct mm_struct *mm)
|
|
{
|
|
if (mm->hiwater_vm < mm->total_vm)
|
|
mm->hiwater_vm = mm->total_vm;
|
|
}
|
|
|
|
static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
|
|
{
|
|
mm->hiwater_rss = get_mm_rss(mm);
|
|
}
|
|
|
|
static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
|
|
struct mm_struct *mm)
|
|
{
|
|
unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
|
|
|
|
if (*maxrss < hiwater_rss)
|
|
*maxrss = hiwater_rss;
|
|
}
|
|
|
|
#if defined(SPLIT_RSS_COUNTING)
|
|
void sync_mm_rss(struct mm_struct *mm);
|
|
#else
|
|
static inline void sync_mm_rss(struct mm_struct *mm)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTE_DEVMAP
|
|
static inline int pte_devmap(pte_t pte)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot);
|
|
|
|
extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
|
|
spinlock_t **ptl);
|
|
static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
|
|
spinlock_t **ptl)
|
|
{
|
|
pte_t *ptep;
|
|
__cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
|
|
return ptep;
|
|
}
|
|
|
|
#ifdef __PAGETABLE_PUD_FOLDED
|
|
static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
|
|
unsigned long address)
|
|
{
|
|
return 0;
|
|
}
|
|
#else
|
|
int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
|
|
#endif
|
|
|
|
#if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU)
|
|
static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
|
|
unsigned long address)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void mm_nr_pmds_init(struct mm_struct *mm) {}
|
|
|
|
static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
|
|
static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
|
|
|
|
#else
|
|
int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
|
|
|
|
static inline void mm_nr_pmds_init(struct mm_struct *mm)
|
|
{
|
|
atomic_long_set(&mm->nr_pmds, 0);
|
|
}
|
|
|
|
static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
|
|
{
|
|
return atomic_long_read(&mm->nr_pmds);
|
|
}
|
|
|
|
static inline void mm_inc_nr_pmds(struct mm_struct *mm)
|
|
{
|
|
atomic_long_inc(&mm->nr_pmds);
|
|
}
|
|
|
|
static inline void mm_dec_nr_pmds(struct mm_struct *mm)
|
|
{
|
|
atomic_long_dec(&mm->nr_pmds);
|
|
}
|
|
#endif
|
|
|
|
int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
|
|
int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
|
|
|
|
/*
|
|
* The following ifdef needed to get the 4level-fixup.h header to work.
|
|
* Remove it when 4level-fixup.h has been removed.
|
|
*/
|
|
#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
|
|
static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
|
|
{
|
|
return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
|
|
NULL: pud_offset(pgd, address);
|
|
}
|
|
|
|
static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
|
|
{
|
|
return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
|
|
NULL: pmd_offset(pud, address);
|
|
}
|
|
#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
|
|
|
|
#if USE_SPLIT_PTE_PTLOCKS
|
|
#if ALLOC_SPLIT_PTLOCKS
|
|
void __init ptlock_cache_init(void);
|
|
extern bool ptlock_alloc(struct page *page);
|
|
extern void ptlock_free(struct page *page);
|
|
|
|
static inline spinlock_t *ptlock_ptr(struct page *page)
|
|
{
|
|
return page->ptl;
|
|
}
|
|
#else /* ALLOC_SPLIT_PTLOCKS */
|
|
static inline void ptlock_cache_init(void)
|
|
{
|
|
}
|
|
|
|
static inline bool ptlock_alloc(struct page *page)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline void ptlock_free(struct page *page)
|
|
{
|
|
}
|
|
|
|
static inline spinlock_t *ptlock_ptr(struct page *page)
|
|
{
|
|
return &page->ptl;
|
|
}
|
|
#endif /* ALLOC_SPLIT_PTLOCKS */
|
|
|
|
static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
return ptlock_ptr(pmd_page(*pmd));
|
|
}
|
|
|
|
static inline bool ptlock_init(struct page *page)
|
|
{
|
|
/*
|
|
* prep_new_page() initialize page->private (and therefore page->ptl)
|
|
* with 0. Make sure nobody took it in use in between.
|
|
*
|
|
* It can happen if arch try to use slab for page table allocation:
|
|
* slab code uses page->slab_cache, which share storage with page->ptl.
|
|
*/
|
|
VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
|
|
if (!ptlock_alloc(page))
|
|
return false;
|
|
spin_lock_init(ptlock_ptr(page));
|
|
return true;
|
|
}
|
|
|
|
/* Reset page->mapping so free_pages_check won't complain. */
|
|
static inline void pte_lock_deinit(struct page *page)
|
|
{
|
|
page->mapping = NULL;
|
|
ptlock_free(page);
|
|
}
|
|
|
|
#else /* !USE_SPLIT_PTE_PTLOCKS */
|
|
/*
|
|
* We use mm->page_table_lock to guard all pagetable pages of the mm.
|
|
*/
|
|
static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
return &mm->page_table_lock;
|
|
}
|
|
static inline void ptlock_cache_init(void) {}
|
|
static inline bool ptlock_init(struct page *page) { return true; }
|
|
static inline void pte_lock_deinit(struct page *page) {}
|
|
#endif /* USE_SPLIT_PTE_PTLOCKS */
|
|
|
|
static inline void pgtable_init(void)
|
|
{
|
|
ptlock_cache_init();
|
|
pgtable_cache_init();
|
|
}
|
|
|
|
static inline bool pgtable_page_ctor(struct page *page)
|
|
{
|
|
if (!ptlock_init(page))
|
|
return false;
|
|
inc_zone_page_state(page, NR_PAGETABLE);
|
|
return true;
|
|
}
|
|
|
|
static inline void pgtable_page_dtor(struct page *page)
|
|
{
|
|
pte_lock_deinit(page);
|
|
dec_zone_page_state(page, NR_PAGETABLE);
|
|
}
|
|
|
|
#define pte_offset_map_lock(mm, pmd, address, ptlp) \
|
|
({ \
|
|
spinlock_t *__ptl = pte_lockptr(mm, pmd); \
|
|
pte_t *__pte = pte_offset_map(pmd, address); \
|
|
*(ptlp) = __ptl; \
|
|
spin_lock(__ptl); \
|
|
__pte; \
|
|
})
|
|
|
|
#define pte_unmap_unlock(pte, ptl) do { \
|
|
spin_unlock(ptl); \
|
|
pte_unmap(pte); \
|
|
} while (0)
|
|
|
|
#define pte_alloc(mm, pmd, address) \
|
|
(unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address))
|
|
|
|
#define pte_alloc_map(mm, pmd, address) \
|
|
(pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address))
|
|
|
|
#define pte_alloc_map_lock(mm, pmd, address, ptlp) \
|
|
(pte_alloc(mm, pmd, address) ? \
|
|
NULL : pte_offset_map_lock(mm, pmd, address, ptlp))
|
|
|
|
#define pte_alloc_kernel(pmd, address) \
|
|
((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
|
|
NULL: pte_offset_kernel(pmd, address))
|
|
|
|
#if USE_SPLIT_PMD_PTLOCKS
|
|
|
|
static struct page *pmd_to_page(pmd_t *pmd)
|
|
{
|
|
unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
|
|
return virt_to_page((void *)((unsigned long) pmd & mask));
|
|
}
|
|
|
|
static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
return ptlock_ptr(pmd_to_page(pmd));
|
|
}
|
|
|
|
static inline bool pgtable_pmd_page_ctor(struct page *page)
|
|
{
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
page->pmd_huge_pte = NULL;
|
|
#endif
|
|
return ptlock_init(page);
|
|
}
|
|
|
|
static inline void pgtable_pmd_page_dtor(struct page *page)
|
|
{
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
|
|
#endif
|
|
ptlock_free(page);
|
|
}
|
|
|
|
#define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
|
|
|
|
#else
|
|
|
|
static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
return &mm->page_table_lock;
|
|
}
|
|
|
|
static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; }
|
|
static inline void pgtable_pmd_page_dtor(struct page *page) {}
|
|
|
|
#define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
|
|
|
|
#endif
|
|
|
|
static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
spinlock_t *ptl = pmd_lockptr(mm, pmd);
|
|
spin_lock(ptl);
|
|
return ptl;
|
|
}
|
|
|
|
extern void free_area_init(unsigned long * zones_size);
|
|
extern void free_area_init_node(int nid, unsigned long * zones_size,
|
|
unsigned long zone_start_pfn, unsigned long *zholes_size);
|
|
extern void free_initmem(void);
|
|
|
|
/*
|
|
* Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
|
|
* into the buddy system. The freed pages will be poisoned with pattern
|
|
* "poison" if it's within range [0, UCHAR_MAX].
|
|
* Return pages freed into the buddy system.
|
|
*/
|
|
extern unsigned long free_reserved_area(void *start, void *end,
|
|
int poison, char *s);
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
/*
|
|
* Free a highmem page into the buddy system, adjusting totalhigh_pages
|
|
* and totalram_pages.
|
|
*/
|
|
extern void free_highmem_page(struct page *page);
|
|
#endif
|
|
|
|
extern void adjust_managed_page_count(struct page *page, long count);
|
|
extern void mem_init_print_info(const char *str);
|
|
|
|
extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end);
|
|
|
|
/* Free the reserved page into the buddy system, so it gets managed. */
|
|
static inline void __free_reserved_page(struct page *page)
|
|
{
|
|
ClearPageReserved(page);
|
|
init_page_count(page);
|
|
__free_page(page);
|
|
}
|
|
|
|
static inline void free_reserved_page(struct page *page)
|
|
{
|
|
__free_reserved_page(page);
|
|
adjust_managed_page_count(page, 1);
|
|
}
|
|
|
|
static inline void mark_page_reserved(struct page *page)
|
|
{
|
|
SetPageReserved(page);
|
|
adjust_managed_page_count(page, -1);
|
|
}
|
|
|
|
/*
|
|
* Default method to free all the __init memory into the buddy system.
|
|
* The freed pages will be poisoned with pattern "poison" if it's within
|
|
* range [0, UCHAR_MAX].
|
|
* Return pages freed into the buddy system.
|
|
*/
|
|
static inline unsigned long free_initmem_default(int poison)
|
|
{
|
|
extern char __init_begin[], __init_end[];
|
|
|
|
return free_reserved_area(&__init_begin, &__init_end,
|
|
poison, "unused kernel");
|
|
}
|
|
|
|
static inline unsigned long get_num_physpages(void)
|
|
{
|
|
int nid;
|
|
unsigned long phys_pages = 0;
|
|
|
|
for_each_online_node(nid)
|
|
phys_pages += node_present_pages(nid);
|
|
|
|
return phys_pages;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
|
|
/*
|
|
* With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
|
|
* zones, allocate the backing mem_map and account for memory holes in a more
|
|
* architecture independent manner. This is a substitute for creating the
|
|
* zone_sizes[] and zholes_size[] arrays and passing them to
|
|
* free_area_init_node()
|
|
*
|
|
* An architecture is expected to register range of page frames backed by
|
|
* physical memory with memblock_add[_node]() before calling
|
|
* free_area_init_nodes() passing in the PFN each zone ends at. At a basic
|
|
* usage, an architecture is expected to do something like
|
|
*
|
|
* unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
|
|
* max_highmem_pfn};
|
|
* for_each_valid_physical_page_range()
|
|
* memblock_add_node(base, size, nid)
|
|
* free_area_init_nodes(max_zone_pfns);
|
|
*
|
|
* free_bootmem_with_active_regions() calls free_bootmem_node() for each
|
|
* registered physical page range. Similarly
|
|
* sparse_memory_present_with_active_regions() calls memory_present() for
|
|
* each range when SPARSEMEM is enabled.
|
|
*
|
|
* See mm/page_alloc.c for more information on each function exposed by
|
|
* CONFIG_HAVE_MEMBLOCK_NODE_MAP.
|
|
*/
|
|
extern void free_area_init_nodes(unsigned long *max_zone_pfn);
|
|
unsigned long node_map_pfn_alignment(void);
|
|
unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
|
|
unsigned long end_pfn);
|
|
extern unsigned long absent_pages_in_range(unsigned long start_pfn,
|
|
unsigned long end_pfn);
|
|
extern void get_pfn_range_for_nid(unsigned int nid,
|
|
unsigned long *start_pfn, unsigned long *end_pfn);
|
|
extern unsigned long find_min_pfn_with_active_regions(void);
|
|
extern void free_bootmem_with_active_regions(int nid,
|
|
unsigned long max_low_pfn);
|
|
extern void sparse_memory_present_with_active_regions(int nid);
|
|
|
|
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
|
|
|
|
#if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
|
|
!defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
|
|
static inline int __early_pfn_to_nid(unsigned long pfn,
|
|
struct mminit_pfnnid_cache *state)
|
|
{
|
|
return 0;
|
|
}
|
|
#else
|
|
/* please see mm/page_alloc.c */
|
|
extern int __meminit early_pfn_to_nid(unsigned long pfn);
|
|
/* there is a per-arch backend function. */
|
|
extern int __meminit __early_pfn_to_nid(unsigned long pfn,
|
|
struct mminit_pfnnid_cache *state);
|
|
#endif
|
|
|
|
extern void set_dma_reserve(unsigned long new_dma_reserve);
|
|
extern void memmap_init_zone(unsigned long, int, unsigned long,
|
|
unsigned long, enum memmap_context);
|
|
extern void setup_per_zone_wmarks(void);
|
|
extern int __meminit init_per_zone_wmark_min(void);
|
|
extern void mem_init(void);
|
|
extern void __init mmap_init(void);
|
|
extern void show_mem(unsigned int flags);
|
|
extern long si_mem_available(void);
|
|
extern void si_meminfo(struct sysinfo * val);
|
|
extern void si_meminfo_node(struct sysinfo *val, int nid);
|
|
#ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES
|
|
extern unsigned long arch_reserved_kernel_pages(void);
|
|
#endif
|
|
|
|
extern __printf(2, 3)
|
|
void warn_alloc(gfp_t gfp_mask, const char *fmt, ...);
|
|
|
|
extern void setup_per_cpu_pageset(void);
|
|
|
|
extern void zone_pcp_update(struct zone *zone);
|
|
extern void zone_pcp_reset(struct zone *zone);
|
|
|
|
/* page_alloc.c */
|
|
extern int min_free_kbytes;
|
|
extern int watermark_scale_factor;
|
|
|
|
/* nommu.c */
|
|
extern atomic_long_t mmap_pages_allocated;
|
|
extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
|
|
|
|
/* interval_tree.c */
|
|
void vma_interval_tree_insert(struct vm_area_struct *node,
|
|
struct rb_root *root);
|
|
void vma_interval_tree_insert_after(struct vm_area_struct *node,
|
|
struct vm_area_struct *prev,
|
|
struct rb_root *root);
|
|
void vma_interval_tree_remove(struct vm_area_struct *node,
|
|
struct rb_root *root);
|
|
struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root,
|
|
unsigned long start, unsigned long last);
|
|
struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
|
|
unsigned long start, unsigned long last);
|
|
|
|
#define vma_interval_tree_foreach(vma, root, start, last) \
|
|
for (vma = vma_interval_tree_iter_first(root, start, last); \
|
|
vma; vma = vma_interval_tree_iter_next(vma, start, last))
|
|
|
|
void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
|
|
struct rb_root *root);
|
|
void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
|
|
struct rb_root *root);
|
|
struct anon_vma_chain *anon_vma_interval_tree_iter_first(
|
|
struct rb_root *root, unsigned long start, unsigned long last);
|
|
struct anon_vma_chain *anon_vma_interval_tree_iter_next(
|
|
struct anon_vma_chain *node, unsigned long start, unsigned long last);
|
|
#ifdef CONFIG_DEBUG_VM_RB
|
|
void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
|
|
#endif
|
|
|
|
#define anon_vma_interval_tree_foreach(avc, root, start, last) \
|
|
for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
|
|
avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))
|
|
|
|
/* mmap.c */
|
|
extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
|
|
extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
|
|
unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert,
|
|
struct vm_area_struct *expand);
|
|
static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start,
|
|
unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert)
|
|
{
|
|
return __vma_adjust(vma, start, end, pgoff, insert, NULL);
|
|
}
|
|
extern struct vm_area_struct *vma_merge(struct mm_struct *,
|
|
struct vm_area_struct *prev, unsigned long addr, unsigned long end,
|
|
unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
|
|
struct mempolicy *, struct vm_userfaultfd_ctx);
|
|
extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
|
|
extern int split_vma(struct mm_struct *,
|
|
struct vm_area_struct *, unsigned long addr, int new_below);
|
|
extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
|
|
extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
|
|
struct rb_node **, struct rb_node *);
|
|
extern void unlink_file_vma(struct vm_area_struct *);
|
|
extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
|
|
unsigned long addr, unsigned long len, pgoff_t pgoff,
|
|
bool *need_rmap_locks);
|
|
extern void exit_mmap(struct mm_struct *);
|
|
|
|
static inline int check_data_rlimit(unsigned long rlim,
|
|
unsigned long new,
|
|
unsigned long start,
|
|
unsigned long end_data,
|
|
unsigned long start_data)
|
|
{
|
|
if (rlim < RLIM_INFINITY) {
|
|
if (((new - start) + (end_data - start_data)) > rlim)
|
|
return -ENOSPC;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
extern int mm_take_all_locks(struct mm_struct *mm);
|
|
extern void mm_drop_all_locks(struct mm_struct *mm);
|
|
|
|
extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
|
|
extern struct file *get_mm_exe_file(struct mm_struct *mm);
|
|
extern struct file *get_task_exe_file(struct task_struct *task);
|
|
|
|
extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages);
|
|
extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages);
|
|
|
|
extern bool vma_is_special_mapping(const struct vm_area_struct *vma,
|
|
const struct vm_special_mapping *sm);
|
|
extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
|
|
unsigned long addr, unsigned long len,
|
|
unsigned long flags,
|
|
const struct vm_special_mapping *spec);
|
|
/* This is an obsolete alternative to _install_special_mapping. */
|
|
extern int install_special_mapping(struct mm_struct *mm,
|
|
unsigned long addr, unsigned long len,
|
|
unsigned long flags, struct page **pages);
|
|
|
|
extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
|
|
|
|
extern unsigned long mmap_region(struct file *file, unsigned long addr,
|
|
unsigned long len, vm_flags_t vm_flags, unsigned long pgoff);
|
|
extern unsigned long do_mmap(struct file *file, unsigned long addr,
|
|
unsigned long len, unsigned long prot, unsigned long flags,
|
|
vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate);
|
|
extern int do_munmap(struct mm_struct *, unsigned long, size_t);
|
|
|
|
static inline unsigned long
|
|
do_mmap_pgoff(struct file *file, unsigned long addr,
|
|
unsigned long len, unsigned long prot, unsigned long flags,
|
|
unsigned long pgoff, unsigned long *populate)
|
|
{
|
|
return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate);
|
|
}
|
|
|
|
#ifdef CONFIG_MMU
|
|
extern int __mm_populate(unsigned long addr, unsigned long len,
|
|
int ignore_errors);
|
|
static inline void mm_populate(unsigned long addr, unsigned long len)
|
|
{
|
|
/* Ignore errors */
|
|
(void) __mm_populate(addr, len, 1);
|
|
}
|
|
#else
|
|
static inline void mm_populate(unsigned long addr, unsigned long len) {}
|
|
#endif
|
|
|
|
/* These take the mm semaphore themselves */
|
|
extern int __must_check vm_brk(unsigned long, unsigned long);
|
|
extern int vm_munmap(unsigned long, size_t);
|
|
extern unsigned long __must_check vm_mmap(struct file *, unsigned long,
|
|
unsigned long, unsigned long,
|
|
unsigned long, unsigned long);
|
|
|
|
struct vm_unmapped_area_info {
|
|
#define VM_UNMAPPED_AREA_TOPDOWN 1
|
|
unsigned long flags;
|
|
unsigned long length;
|
|
unsigned long low_limit;
|
|
unsigned long high_limit;
|
|
unsigned long align_mask;
|
|
unsigned long align_offset;
|
|
};
|
|
|
|
extern unsigned long unmapped_area(struct vm_unmapped_area_info *info);
|
|
extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info);
|
|
|
|
/*
|
|
* Search for an unmapped address range.
|
|
*
|
|
* We are looking for a range that:
|
|
* - does not intersect with any VMA;
|
|
* - is contained within the [low_limit, high_limit) interval;
|
|
* - is at least the desired size.
|
|
* - satisfies (begin_addr & align_mask) == (align_offset & align_mask)
|
|
*/
|
|
static inline unsigned long
|
|
vm_unmapped_area(struct vm_unmapped_area_info *info)
|
|
{
|
|
if (info->flags & VM_UNMAPPED_AREA_TOPDOWN)
|
|
return unmapped_area_topdown(info);
|
|
else
|
|
return unmapped_area(info);
|
|
}
|
|
|
|
/* truncate.c */
|
|
extern void truncate_inode_pages(struct address_space *, loff_t);
|
|
extern void truncate_inode_pages_range(struct address_space *,
|
|
loff_t lstart, loff_t lend);
|
|
extern void truncate_inode_pages_final(struct address_space *);
|
|
|
|
/* generic vm_area_ops exported for stackable file systems */
|
|
extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
|
|
extern void filemap_map_pages(struct fault_env *fe,
|
|
pgoff_t start_pgoff, pgoff_t end_pgoff);
|
|
extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
|
|
|
|
/* mm/page-writeback.c */
|
|
int write_one_page(struct page *page, int wait);
|
|
void task_dirty_inc(struct task_struct *tsk);
|
|
|
|
/* readahead.c */
|
|
#define VM_MAX_READAHEAD 128 /* kbytes */
|
|
#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
|
|
|
|
int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
|
|
pgoff_t offset, unsigned long nr_to_read);
|
|
|
|
void page_cache_sync_readahead(struct address_space *mapping,
|
|
struct file_ra_state *ra,
|
|
struct file *filp,
|
|
pgoff_t offset,
|
|
unsigned long size);
|
|
|
|
void page_cache_async_readahead(struct address_space *mapping,
|
|
struct file_ra_state *ra,
|
|
struct file *filp,
|
|
struct page *pg,
|
|
pgoff_t offset,
|
|
unsigned long size);
|
|
|
|
/* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
|
|
extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
|
|
|
|
/* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
|
|
extern int expand_downwards(struct vm_area_struct *vma,
|
|
unsigned long address);
|
|
#if VM_GROWSUP
|
|
extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
|
|
#else
|
|
#define expand_upwards(vma, address) (0)
|
|
#endif
|
|
|
|
/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
|
|
extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
|
|
extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
|
|
struct vm_area_struct **pprev);
|
|
|
|
/* Look up the first VMA which intersects the interval start_addr..end_addr-1,
|
|
NULL if none. Assume start_addr < end_addr. */
|
|
static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
|
|
{
|
|
struct vm_area_struct * vma = find_vma(mm,start_addr);
|
|
|
|
if (vma && end_addr <= vma->vm_start)
|
|
vma = NULL;
|
|
return vma;
|
|
}
|
|
|
|
static inline unsigned long vma_pages(struct vm_area_struct *vma)
|
|
{
|
|
return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
|
|
}
|
|
|
|
/* Look up the first VMA which exactly match the interval vm_start ... vm_end */
|
|
static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
|
|
unsigned long vm_start, unsigned long vm_end)
|
|
{
|
|
struct vm_area_struct *vma = find_vma(mm, vm_start);
|
|
|
|
if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
|
|
vma = NULL;
|
|
|
|
return vma;
|
|
}
|
|
|
|
#ifdef CONFIG_MMU
|
|
pgprot_t vm_get_page_prot(unsigned long vm_flags);
|
|
void vma_set_page_prot(struct vm_area_struct *vma);
|
|
#else
|
|
static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
|
|
{
|
|
return __pgprot(0);
|
|
}
|
|
static inline void vma_set_page_prot(struct vm_area_struct *vma)
|
|
{
|
|
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
unsigned long change_prot_numa(struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end);
|
|
#endif
|
|
|
|
struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
|
|
int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
|
|
unsigned long pfn, unsigned long size, pgprot_t);
|
|
int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
|
|
int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
|
|
unsigned long pfn);
|
|
int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
|
|
unsigned long pfn, pgprot_t pgprot);
|
|
int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
|
|
pfn_t pfn);
|
|
int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);
|
|
|
|
|
|
struct page *follow_page_mask(struct vm_area_struct *vma,
|
|
unsigned long address, unsigned int foll_flags,
|
|
unsigned int *page_mask);
|
|
|
|
static inline struct page *follow_page(struct vm_area_struct *vma,
|
|
unsigned long address, unsigned int foll_flags)
|
|
{
|
|
unsigned int unused_page_mask;
|
|
return follow_page_mask(vma, address, foll_flags, &unused_page_mask);
|
|
}
|
|
|
|
#define FOLL_WRITE 0x01 /* check pte is writable */
|
|
#define FOLL_TOUCH 0x02 /* mark page accessed */
|
|
#define FOLL_GET 0x04 /* do get_page on page */
|
|
#define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
|
|
#define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
|
|
#define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
|
|
* and return without waiting upon it */
|
|
#define FOLL_POPULATE 0x40 /* fault in page */
|
|
#define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
|
|
#define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
|
|
#define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
|
|
#define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
|
|
#define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
|
|
#define FOLL_MLOCK 0x1000 /* lock present pages */
|
|
#define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
|
|
#define FOLL_COW 0x4000 /* internal GUP flag */
|
|
|
|
typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
|
|
void *data);
|
|
extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
|
|
unsigned long size, pte_fn_t fn, void *data);
|
|
|
|
|
|
#ifdef CONFIG_PAGE_POISONING
|
|
extern bool page_poisoning_enabled(void);
|
|
extern void kernel_poison_pages(struct page *page, int numpages, int enable);
|
|
extern bool page_is_poisoned(struct page *page);
|
|
#else
|
|
static inline bool page_poisoning_enabled(void) { return false; }
|
|
static inline void kernel_poison_pages(struct page *page, int numpages,
|
|
int enable) { }
|
|
static inline bool page_is_poisoned(struct page *page) { return false; }
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
extern bool _debug_pagealloc_enabled;
|
|
extern void __kernel_map_pages(struct page *page, int numpages, int enable);
|
|
|
|
static inline bool debug_pagealloc_enabled(void)
|
|
{
|
|
return _debug_pagealloc_enabled;
|
|
}
|
|
|
|
static inline void
|
|
kernel_map_pages(struct page *page, int numpages, int enable)
|
|
{
|
|
if (!debug_pagealloc_enabled())
|
|
return;
|
|
|
|
__kernel_map_pages(page, numpages, enable);
|
|
}
|
|
#ifdef CONFIG_HIBERNATION
|
|
extern bool kernel_page_present(struct page *page);
|
|
#endif /* CONFIG_HIBERNATION */
|
|
#else /* CONFIG_DEBUG_PAGEALLOC */
|
|
static inline void
|
|
kernel_map_pages(struct page *page, int numpages, int enable) {}
|
|
#ifdef CONFIG_HIBERNATION
|
|
static inline bool kernel_page_present(struct page *page) { return true; }
|
|
#endif /* CONFIG_HIBERNATION */
|
|
static inline bool debug_pagealloc_enabled(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_DEBUG_PAGEALLOC */
|
|
|
|
#ifdef __HAVE_ARCH_GATE_AREA
|
|
extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
|
|
extern int in_gate_area_no_mm(unsigned long addr);
|
|
extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
|
|
#else
|
|
static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
|
|
static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* __HAVE_ARCH_GATE_AREA */
|
|
|
|
extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
extern int sysctl_drop_caches;
|
|
int drop_caches_sysctl_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
#endif
|
|
|
|
void drop_slab(void);
|
|
void drop_slab_node(int nid);
|
|
|
|
#ifndef CONFIG_MMU
|
|
#define randomize_va_space 0
|
|
#else
|
|
extern int randomize_va_space;
|
|
#endif
|
|
|
|
const char * arch_vma_name(struct vm_area_struct *vma);
|
|
void print_vma_addr(char *prefix, unsigned long rip);
|
|
|
|
void sparse_mem_maps_populate_node(struct page **map_map,
|
|
unsigned long pnum_begin,
|
|
unsigned long pnum_end,
|
|
unsigned long map_count,
|
|
int nodeid);
|
|
|
|
struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
|
|
pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
|
|
pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
|
|
pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
|
|
pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
|
|
void *vmemmap_alloc_block(unsigned long size, int node);
|
|
struct vmem_altmap;
|
|
void *__vmemmap_alloc_block_buf(unsigned long size, int node,
|
|
struct vmem_altmap *altmap);
|
|
static inline void *vmemmap_alloc_block_buf(unsigned long size, int node)
|
|
{
|
|
return __vmemmap_alloc_block_buf(size, node, NULL);
|
|
}
|
|
|
|
void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
|
|
int vmemmap_populate_basepages(unsigned long start, unsigned long end,
|
|
int node);
|
|
int vmemmap_populate(unsigned long start, unsigned long end, int node);
|
|
void vmemmap_populate_print_last(void);
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
void vmemmap_free(unsigned long start, unsigned long end);
|
|
#endif
|
|
void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
|
|
unsigned long size);
|
|
|
|
enum mf_flags {
|
|
MF_COUNT_INCREASED = 1 << 0,
|
|
MF_ACTION_REQUIRED = 1 << 1,
|
|
MF_MUST_KILL = 1 << 2,
|
|
MF_SOFT_OFFLINE = 1 << 3,
|
|
};
|
|
extern int memory_failure(unsigned long pfn, int trapno, int flags);
|
|
extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
|
|
extern int unpoison_memory(unsigned long pfn);
|
|
extern int get_hwpoison_page(struct page *page);
|
|
#define put_hwpoison_page(page) put_page(page)
|
|
extern int sysctl_memory_failure_early_kill;
|
|
extern int sysctl_memory_failure_recovery;
|
|
extern void shake_page(struct page *p, int access);
|
|
extern atomic_long_t num_poisoned_pages;
|
|
extern int soft_offline_page(struct page *page, int flags);
|
|
|
|
|
|
/*
|
|
* Error handlers for various types of pages.
|
|
*/
|
|
enum mf_result {
|
|
MF_IGNORED, /* Error: cannot be handled */
|
|
MF_FAILED, /* Error: handling failed */
|
|
MF_DELAYED, /* Will be handled later */
|
|
MF_RECOVERED, /* Successfully recovered */
|
|
};
|
|
|
|
enum mf_action_page_type {
|
|
MF_MSG_KERNEL,
|
|
MF_MSG_KERNEL_HIGH_ORDER,
|
|
MF_MSG_SLAB,
|
|
MF_MSG_DIFFERENT_COMPOUND,
|
|
MF_MSG_POISONED_HUGE,
|
|
MF_MSG_HUGE,
|
|
MF_MSG_FREE_HUGE,
|
|
MF_MSG_UNMAP_FAILED,
|
|
MF_MSG_DIRTY_SWAPCACHE,
|
|
MF_MSG_CLEAN_SWAPCACHE,
|
|
MF_MSG_DIRTY_MLOCKED_LRU,
|
|
MF_MSG_CLEAN_MLOCKED_LRU,
|
|
MF_MSG_DIRTY_UNEVICTABLE_LRU,
|
|
MF_MSG_CLEAN_UNEVICTABLE_LRU,
|
|
MF_MSG_DIRTY_LRU,
|
|
MF_MSG_CLEAN_LRU,
|
|
MF_MSG_TRUNCATED_LRU,
|
|
MF_MSG_BUDDY,
|
|
MF_MSG_BUDDY_2ND,
|
|
MF_MSG_UNKNOWN,
|
|
};
|
|
|
|
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
|
|
extern void clear_huge_page(struct page *page,
|
|
unsigned long addr,
|
|
unsigned int pages_per_huge_page);
|
|
extern void copy_user_huge_page(struct page *dst, struct page *src,
|
|
unsigned long addr, struct vm_area_struct *vma,
|
|
unsigned int pages_per_huge_page);
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
|
|
|
|
extern struct page_ext_operations debug_guardpage_ops;
|
|
extern struct page_ext_operations page_poisoning_ops;
|
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
extern unsigned int _debug_guardpage_minorder;
|
|
extern bool _debug_guardpage_enabled;
|
|
|
|
static inline unsigned int debug_guardpage_minorder(void)
|
|
{
|
|
return _debug_guardpage_minorder;
|
|
}
|
|
|
|
static inline bool debug_guardpage_enabled(void)
|
|
{
|
|
return _debug_guardpage_enabled;
|
|
}
|
|
|
|
static inline bool page_is_guard(struct page *page)
|
|
{
|
|
struct page_ext *page_ext;
|
|
|
|
if (!debug_guardpage_enabled())
|
|
return false;
|
|
|
|
page_ext = lookup_page_ext(page);
|
|
if (unlikely(!page_ext))
|
|
return false;
|
|
|
|
return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
|
|
}
|
|
#else
|
|
static inline unsigned int debug_guardpage_minorder(void) { return 0; }
|
|
static inline bool debug_guardpage_enabled(void) { return false; }
|
|
static inline bool page_is_guard(struct page *page) { return false; }
|
|
#endif /* CONFIG_DEBUG_PAGEALLOC */
|
|
|
|
#if MAX_NUMNODES > 1
|
|
void __init setup_nr_node_ids(void);
|
|
#else
|
|
static inline void setup_nr_node_ids(void) {}
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_MM_H */
|