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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115/* 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>
/* Bit indices that affect a whole block of pages */enum pageblock_bits { PB_migrate_0, PB_migrate_1, PB_migrate_2, PB_compact_skip,/* If set the block is skipped by compaction */
#ifdef CONFIG_MEMORY_ISOLATION /* * Pageblock isolation is represented with a separate bit, so that * the migratetype of a block is not overwritten by isolation. */ PB_migrate_isolate, /* If set the block is isolated */#endif /* * Assume the bits will always align on a word. If this assumption * changes then get/set pageblock needs updating. */ __NR_PAGEBLOCK_BITS};
#define NR_PAGEBLOCK_BITS (roundup_pow_of_two(__NR_PAGEBLOCK_BITS))
#define PAGEBLOCK_MIGRATETYPE_MASK (BIT(PB_migrate_0)|BIT(PB_migrate_1)|BIT(PB_migrate_2))
#ifdef CONFIG_MEMORY_ISOLATION#define PAGEBLOCK_ISO_MASK BIT(PB_migrate_isolate)#else#define PAGEBLOCK_ISO_MASK 0#endif
#if defined(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, but don't exceed the maximum allocation * granularity. */#define pageblock_order MIN_T(unsigned int, HUGETLB_PAGE_ORDER, PAGE_BLOCK_MAX_ORDER)
#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
#elif defined(CONFIG_TRANSPARENT_HUGEPAGE)
#define pageblock_order MIN_T(unsigned int, HPAGE_PMD_ORDER, PAGE_BLOCK_MAX_ORDER)
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
/* If huge pages are not used, group by PAGE_BLOCK_MAX_ORDER */#define pageblock_order PAGE_BLOCK_MAX_ORDER
#endif /* CONFIG_HUGETLB_PAGE */
#define pageblock_nr_pages (1UL << pageblock_order)#define pageblock_align(pfn) ALIGN((pfn), pageblock_nr_pages)#define pageblock_aligned(pfn) IS_ALIGNED((pfn), pageblock_nr_pages)#define pageblock_start_pfn(pfn) ALIGN_DOWN((pfn), pageblock_nr_pages)#define pageblock_end_pfn(pfn) ALIGN((pfn) + 1, pageblock_nr_pages)
/* Forward declaration */struct page;
enum migratetype get_pfnblock_migratetype(const struct page *page, unsigned long pfn);bool get_pfnblock_bit(const struct page *page, unsigned long pfn, enum pageblock_bits pb_bit);void set_pfnblock_bit(const struct page *page, unsigned long pfn, enum pageblock_bits pb_bit);void clear_pfnblock_bit(const struct page *page, unsigned long pfn, enum pageblock_bits pb_bit);
/* Declarations for getting and setting flags. See mm/page_alloc.c */#ifdef CONFIG_COMPACTION#define get_pageblock_skip(page) \ get_pfnblock_bit(page, page_to_pfn(page), PB_compact_skip)#define clear_pageblock_skip(page) \ clear_pfnblock_bit(page, page_to_pfn(page), PB_compact_skip)#define set_pageblock_skip(page) \ set_pfnblock_bit(page, page_to_pfn(page), PB_compact_skip)#elsestatic 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 */