103 lines · c
1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Macros for manipulating and testing flags related to a4 * pageblock_nr_pages number of pages.5 *6 * Copyright (C) IBM Corporation, 20067 *8 * Original author, Mel Gorman9 * Major cleanups and reduction of bit operations, Andy Whitcroft10 */11#ifndef PAGEBLOCK_FLAGS_H12#define PAGEBLOCK_FLAGS_H13 14#include <linux/types.h>15 16#define PB_migratetype_bits 317/* Bit indices that affect a whole block of pages */18enum pageblock_bits {19 PB_migrate,20 PB_migrate_end = PB_migrate + PB_migratetype_bits - 1,21 /* 3 bits required for migrate types */22 PB_migrate_skip,/* If set the block is skipped by compaction */23 24 /*25 * Assume the bits will always align on a word. If this assumption26 * changes then get/set pageblock needs updating.27 */28 NR_PAGEBLOCK_BITS29};30 31#if defined(CONFIG_HUGETLB_PAGE)32 33#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE34 35/* Huge page sizes are variable */36extern unsigned int pageblock_order;37 38#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */39 40/*41 * Huge pages are a constant size, but don't exceed the maximum allocation42 * granularity.43 */44#define pageblock_order MIN_T(unsigned int, HUGETLB_PAGE_ORDER, MAX_PAGE_ORDER)45 46#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */47 48#elif defined(CONFIG_TRANSPARENT_HUGEPAGE)49 50#define pageblock_order MIN_T(unsigned int, HPAGE_PMD_ORDER, MAX_PAGE_ORDER)51 52#else /* CONFIG_TRANSPARENT_HUGEPAGE */53 54/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */55#define pageblock_order MAX_PAGE_ORDER56 57#endif /* CONFIG_HUGETLB_PAGE */58 59#define pageblock_nr_pages (1UL << pageblock_order)60#define pageblock_align(pfn) ALIGN((pfn), pageblock_nr_pages)61#define pageblock_aligned(pfn) IS_ALIGNED((pfn), pageblock_nr_pages)62#define pageblock_start_pfn(pfn) ALIGN_DOWN((pfn), pageblock_nr_pages)63#define pageblock_end_pfn(pfn) ALIGN((pfn) + 1, pageblock_nr_pages)64 65/* Forward declaration */66struct page;67 68unsigned long get_pfnblock_flags_mask(const struct page *page,69 unsigned long pfn,70 unsigned long mask);71 72void set_pfnblock_flags_mask(struct page *page,73 unsigned long flags,74 unsigned long pfn,75 unsigned long mask);76 77/* Declarations for getting and setting flags. See mm/page_alloc.c */78#ifdef CONFIG_COMPACTION79#define get_pageblock_skip(page) \80 get_pfnblock_flags_mask(page, page_to_pfn(page), \81 (1 << (PB_migrate_skip)))82#define clear_pageblock_skip(page) \83 set_pfnblock_flags_mask(page, 0, page_to_pfn(page), \84 (1 << PB_migrate_skip))85#define set_pageblock_skip(page) \86 set_pfnblock_flags_mask(page, (1 << PB_migrate_skip), \87 page_to_pfn(page), \88 (1 << PB_migrate_skip))89#else90static inline bool get_pageblock_skip(struct page *page)91{92 return false;93}94static inline void clear_pageblock_skip(struct page *page)95{96}97static inline void set_pageblock_skip(struct page *page)98{99}100#endif /* CONFIG_COMPACTION */101 102#endif /* PAGEBLOCK_FLAGS_H */103