forked from mirrors/linux
5fba4af445
Most architectures have identical or very similar implementation of pte_alloc_one_kernel(), pte_alloc_one(), pte_free_kernel() and pte_free(). Add a generic implementation that can be reused across architectures and enable its use on x86. The generic implementation uses GFP_KERNEL | __GFP_ZERO for the kernel page tables and GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT for the user page tables. The "base" functions for PTE allocation, namely __pte_alloc_one_kernel() and __pte_alloc_one() are intended for the architectures that require additional actions after actual memory allocation or must use non-default GFP flags. x86 is switched to use generic pte_alloc_one_kernel(), pte_free_kernel() and pte_free(). x86 still implements pte_alloc_one() to allow run-time control of GFP flags required for "userpte" command line option. Link: http://lkml.kernel.org/r/1557296232-15361-2-git-send-email-rppt@linux.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Guo Ren <ren_guo@c-sky.com> Cc: Helge Deller <deller@gmx.de> Cc: Ley Foon Tan <lftan@altera.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Sam Creasey <sammy@sammy.net> Cc: Vincent Chen <deanbo422@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_GENERIC_PGALLOC_H
|
|
#define __ASM_GENERIC_PGALLOC_H
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
|
|
#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
|
|
|
|
/**
|
|
* __pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
|
|
* @mm: the mm_struct of the current context
|
|
*
|
|
* This function is intended for architectures that need
|
|
* anything beyond simple page allocation.
|
|
*
|
|
* Return: pointer to the allocated memory or %NULL on error
|
|
*/
|
|
static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm)
|
|
{
|
|
return (pte_t *)__get_free_page(GFP_PGTABLE_KERNEL);
|
|
}
|
|
|
|
#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
|
|
/**
|
|
* pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
|
|
* @mm: the mm_struct of the current context
|
|
*
|
|
* Return: pointer to the allocated memory or %NULL on error
|
|
*/
|
|
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
|
|
{
|
|
return __pte_alloc_one_kernel(mm);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* pte_free_kernel - free PTE-level kernel page table page
|
|
* @mm: the mm_struct of the current context
|
|
* @pte: pointer to the memory containing the page table
|
|
*/
|
|
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
free_page((unsigned long)pte);
|
|
}
|
|
|
|
/**
|
|
* __pte_alloc_one - allocate a page for PTE-level user page table
|
|
* @mm: the mm_struct of the current context
|
|
* @gfp: GFP flags to use for the allocation
|
|
*
|
|
* Allocates a page and runs the pgtable_page_ctor().
|
|
*
|
|
* This function is intended for architectures that need
|
|
* anything beyond simple page allocation or must have custom GFP flags.
|
|
*
|
|
* Return: `struct page` initialized as page table or %NULL on error
|
|
*/
|
|
static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp)
|
|
{
|
|
struct page *pte;
|
|
|
|
pte = alloc_page(gfp);
|
|
if (!pte)
|
|
return NULL;
|
|
if (!pgtable_page_ctor(pte)) {
|
|
__free_page(pte);
|
|
return NULL;
|
|
}
|
|
|
|
return pte;
|
|
}
|
|
|
|
#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
|
|
/**
|
|
* pte_alloc_one - allocate a page for PTE-level user page table
|
|
* @mm: the mm_struct of the current context
|
|
*
|
|
* Allocates a page and runs the pgtable_page_ctor().
|
|
*
|
|
* Return: `struct page` initialized as page table or %NULL on error
|
|
*/
|
|
static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
|
|
{
|
|
return __pte_alloc_one(mm, GFP_PGTABLE_USER);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Should really implement gc for free page table pages. This could be
|
|
* done with a reference count in struct page.
|
|
*/
|
|
|
|
/**
|
|
* pte_free - free PTE-level user page table page
|
|
* @mm: the mm_struct of the current context
|
|
* @pte_page: the `struct page` representing the page table
|
|
*/
|
|
static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
|
|
{
|
|
pgtable_page_dtor(pte_page);
|
|
__free_page(pte_page);
|
|
}
|
|
|
|
#else /* CONFIG_MMU */
|
|
|
|
/* This is enough for a nommu architecture */
|
|
#define check_pgt_cache() do { } while (0)
|
|
|
|
#endif /* CONFIG_MMU */
|
|
|
|
#endif /* __ASM_GENERIC_PGALLOC_H */
|