forked from mirrors/linux
ca891f41c4
The struct page is not modified by these routines, so it can be marked const. Link: https://lkml.kernel.org/r/20210416231531.2521383-6-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Macros for manipulating and testing flags related to a
|
|
* pageblock_nr_pages number of pages.
|
|
*
|
|
* Copyright (C) IBM Corporation, 2006
|
|
*
|
|
* Original author, Mel Gorman
|
|
* Major cleanups and reduction of bit operations, Andy Whitcroft
|
|
*/
|
|
#ifndef PAGEBLOCK_FLAGS_H
|
|
#define PAGEBLOCK_FLAGS_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
#define PB_migratetype_bits 3
|
|
/* Bit indices that affect a whole block of pages */
|
|
enum pageblock_bits {
|
|
PB_migrate,
|
|
PB_migrate_end = PB_migrate + PB_migratetype_bits - 1,
|
|
/* 3 bits required for migrate types */
|
|
PB_migrate_skip,/* If set the block is skipped by compaction */
|
|
|
|
/*
|
|
* Assume the bits will always align on a word. If this assumption
|
|
* changes then get/set pageblock needs updating.
|
|
*/
|
|
NR_PAGEBLOCK_BITS
|
|
};
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
|
|
|
|
/* Huge page sizes are variable */
|
|
extern unsigned int pageblock_order;
|
|
|
|
#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
|
|
|
|
/* Huge pages are a constant size */
|
|
#define pageblock_order HUGETLB_PAGE_ORDER
|
|
|
|
#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
|
|
|
|
#else /* CONFIG_HUGETLB_PAGE */
|
|
|
|
/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
|
|
#define pageblock_order (MAX_ORDER-1)
|
|
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
|
|
|
#define pageblock_nr_pages (1UL << pageblock_order)
|
|
|
|
/* Forward declaration */
|
|
struct page;
|
|
|
|
unsigned long get_pfnblock_flags_mask(const struct page *page,
|
|
unsigned long pfn,
|
|
unsigned long mask);
|
|
|
|
void set_pfnblock_flags_mask(struct page *page,
|
|
unsigned long flags,
|
|
unsigned long pfn,
|
|
unsigned long mask);
|
|
|
|
/* Declarations for getting and setting flags. See mm/page_alloc.c */
|
|
#ifdef CONFIG_COMPACTION
|
|
#define get_pageblock_skip(page) \
|
|
get_pfnblock_flags_mask(page, page_to_pfn(page), \
|
|
(1 << (PB_migrate_skip)))
|
|
#define clear_pageblock_skip(page) \
|
|
set_pfnblock_flags_mask(page, 0, page_to_pfn(page), \
|
|
(1 << PB_migrate_skip))
|
|
#define set_pageblock_skip(page) \
|
|
set_pfnblock_flags_mask(page, (1 << PB_migrate_skip), \
|
|
page_to_pfn(page), \
|
|
(1 << PB_migrate_skip))
|
|
#else
|
|
static inline bool get_pageblock_skip(struct page *page)
|
|
{
|
|
return false;
|
|
}
|
|
static inline void clear_pageblock_skip(struct page *page)
|
|
{
|
|
}
|
|
static inline void set_pageblock_skip(struct page *page)
|
|
{
|
|
}
|
|
#endif /* CONFIG_COMPACTION */
|
|
|
|
#endif /* PAGEBLOCK_FLAGS_H */
|