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 */ 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 assumption 26 * changes then get/set pageblock needs updating. 27 */ 28 NR_PAGEBLOCK_BITS 29}; 30 31#ifdef CONFIG_HUGETLB_PAGE 32 33#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE 34 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 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#else /* CONFIG_HUGETLB_PAGE */ 49 50/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */ 51#define pageblock_order MAX_PAGE_ORDER 52 53#endif /* CONFIG_HUGETLB_PAGE */ 54 55#define pageblock_nr_pages (1UL << pageblock_order) 56#define pageblock_align(pfn) ALIGN((pfn), pageblock_nr_pages) 57#define pageblock_aligned(pfn) IS_ALIGNED((pfn), pageblock_nr_pages) 58#define pageblock_start_pfn(pfn) ALIGN_DOWN((pfn), pageblock_nr_pages) 59#define pageblock_end_pfn(pfn) ALIGN((pfn) + 1, pageblock_nr_pages) 60 61/* Forward declaration */ 62struct page; 63 64unsigned long get_pfnblock_flags_mask(const struct page *page, 65 unsigned long pfn, 66 unsigned long mask); 67 68void set_pfnblock_flags_mask(struct page *page, 69 unsigned long flags, 70 unsigned long pfn, 71 unsigned long mask); 72 73/* Declarations for getting and setting flags. See mm/page_alloc.c */ 74#ifdef CONFIG_COMPACTION 75#define get_pageblock_skip(page) \ 76 get_pfnblock_flags_mask(page, page_to_pfn(page), \ 77 (1 << (PB_migrate_skip))) 78#define clear_pageblock_skip(page) \ 79 set_pfnblock_flags_mask(page, 0, page_to_pfn(page), \ 80 (1 << PB_migrate_skip)) 81#define set_pageblock_skip(page) \ 82 set_pfnblock_flags_mask(page, (1 << PB_migrate_skip), \ 83 page_to_pfn(page), \ 84 (1 << PB_migrate_skip)) 85#else 86static inline bool get_pageblock_skip(struct page *page) 87{ 88 return false; 89} 90static inline void clear_pageblock_skip(struct page *page) 91{ 92} 93static inline void set_pageblock_skip(struct page *page) 94{ 95} 96#endif /* CONFIG_COMPACTION */ 97 98#endif /* PAGEBLOCK_FLAGS_H */ 99