1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Macros for manipulating and testing flags related to a 4 * pageblock_nr_pages number of pages. 5 * 6 * Copyright (C) IBM Corporation, 2006 7 * 8 * Original author, Mel Gorman 9 * Major cleanups and reduction of bit operations, Andy Whitcroft 10 */ 11 #ifndef PAGEBLOCK_FLAGS_H 12 #define PAGEBLOCK_FLAGS_H 13 14 #include <linux/types.h> 15 16 #define PB_migratetype_bits 3 17 /* Bit indices that affect a whole block of pages */ 18 enum 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 assumption 26 * changes then get/set pageblock needs updating. 27 */ 28 NR_PAGEBLOCK_BITS 29 }; 30 31 #if defined(CONFIG_HUGETLB_PAGE) 32 33 #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE 34 35 /* Huge page sizes are variable */ 36 extern 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 allocation 42 * 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_ORDER 56 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 */ 66 struct page; 67 68 unsigned long get_pfnblock_flags_mask(const struct page *page, 69 unsigned long pfn, 70 unsigned long mask); 71 72 void 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_COMPACTION 79 #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 #else get_pageblock_skip(struct page * page)90 static inline bool get_pageblock_skip(struct page *page) 91 { 92 return false; 93 } clear_pageblock_skip(struct page * page)94 static inline void clear_pageblock_skip(struct page *page) 95 { 96 } set_pageblock_skip(struct page * page)97 static inline void set_pageblock_skip(struct page *page) 98 { 99 } 100 #endif /* CONFIG_COMPACTION */ 101 102 #endif /* PAGEBLOCK_FLAGS_H */ 103