internal.h revision 4fd466eb46a6a917c317a87fb94bfc7252a0f7ed
1/* internal.h: mm/ internal definitions 2 * 3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11#ifndef __MM_INTERNAL_H 12#define __MM_INTERNAL_H 13 14#include <linux/mm.h> 15 16void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, 17 unsigned long floor, unsigned long ceiling); 18 19static inline void set_page_count(struct page *page, int v) 20{ 21 atomic_set(&page->_count, v); 22} 23 24/* 25 * Turn a non-refcounted page (->_count == 0) into refcounted with 26 * a count of one. 27 */ 28static inline void set_page_refcounted(struct page *page) 29{ 30 VM_BUG_ON(PageTail(page)); 31 VM_BUG_ON(atomic_read(&page->_count)); 32 set_page_count(page, 1); 33} 34 35static inline void __put_page(struct page *page) 36{ 37 atomic_dec(&page->_count); 38} 39 40extern unsigned long highest_memmap_pfn; 41 42/* 43 * in mm/vmscan.c: 44 */ 45extern int isolate_lru_page(struct page *page); 46extern void putback_lru_page(struct page *page); 47 48/* 49 * in mm/page_alloc.c 50 */ 51extern void __free_pages_bootmem(struct page *page, unsigned int order); 52extern void prep_compound_page(struct page *page, unsigned long order); 53#ifdef CONFIG_MEMORY_FAILURE 54extern bool is_free_buddy_page(struct page *page); 55#endif 56 57 58/* 59 * function for dealing with page's order in buddy system. 60 * zone->lock is already acquired when we use these. 61 * So, we don't need atomic page->flags operations here. 62 */ 63static inline unsigned long page_order(struct page *page) 64{ 65 VM_BUG_ON(!PageBuddy(page)); 66 return page_private(page); 67} 68 69#ifdef CONFIG_MMU 70extern long mlock_vma_pages_range(struct vm_area_struct *vma, 71 unsigned long start, unsigned long end); 72extern void munlock_vma_pages_range(struct vm_area_struct *vma, 73 unsigned long start, unsigned long end); 74static inline void munlock_vma_pages_all(struct vm_area_struct *vma) 75{ 76 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); 77} 78 79/* 80 * Called only in fault path via page_evictable() for a new page 81 * to determine if it's being mapped into a LOCKED vma. 82 * If so, mark page as mlocked. 83 */ 84static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) 85{ 86 VM_BUG_ON(PageLRU(page)); 87 88 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) 89 return 0; 90 91 if (!TestSetPageMlocked(page)) { 92 inc_zone_page_state(page, NR_MLOCK); 93 count_vm_event(UNEVICTABLE_PGMLOCKED); 94 } 95 return 1; 96} 97 98/* 99 * must be called with vma's mmap_sem held for read or write, and page locked. 100 */ 101extern void mlock_vma_page(struct page *page); 102extern void munlock_vma_page(struct page *page); 103 104/* 105 * Clear the page's PageMlocked(). This can be useful in a situation where 106 * we want to unconditionally remove a page from the pagecache -- e.g., 107 * on truncation or freeing. 108 * 109 * It is legal to call this function for any page, mlocked or not. 110 * If called for a page that is still mapped by mlocked vmas, all we do 111 * is revert to lazy LRU behaviour -- semantics are not broken. 112 */ 113extern void __clear_page_mlock(struct page *page); 114static inline void clear_page_mlock(struct page *page) 115{ 116 if (unlikely(TestClearPageMlocked(page))) 117 __clear_page_mlock(page); 118} 119 120/* 121 * mlock_migrate_page - called only from migrate_page_copy() to 122 * migrate the Mlocked page flag; update statistics. 123 */ 124static inline void mlock_migrate_page(struct page *newpage, struct page *page) 125{ 126 if (TestClearPageMlocked(page)) { 127 unsigned long flags; 128 129 local_irq_save(flags); 130 __dec_zone_page_state(page, NR_MLOCK); 131 SetPageMlocked(newpage); 132 __inc_zone_page_state(newpage, NR_MLOCK); 133 local_irq_restore(flags); 134 } 135} 136 137#else /* !CONFIG_MMU */ 138static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) 139{ 140 return 0; 141} 142static inline void clear_page_mlock(struct page *page) { } 143static inline void mlock_vma_page(struct page *page) { } 144static inline void mlock_migrate_page(struct page *new, struct page *old) { } 145 146#endif /* !CONFIG_MMU */ 147 148/* 149 * Return the mem_map entry representing the 'offset' subpage within 150 * the maximally aligned gigantic page 'base'. Handle any discontiguity 151 * in the mem_map at MAX_ORDER_NR_PAGES boundaries. 152 */ 153static inline struct page *mem_map_offset(struct page *base, int offset) 154{ 155 if (unlikely(offset >= MAX_ORDER_NR_PAGES)) 156 return pfn_to_page(page_to_pfn(base) + offset); 157 return base + offset; 158} 159 160/* 161 * Iterator over all subpages withing the maximally aligned gigantic 162 * page 'base'. Handle any discontiguity in the mem_map. 163 */ 164static inline struct page *mem_map_next(struct page *iter, 165 struct page *base, int offset) 166{ 167 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { 168 unsigned long pfn = page_to_pfn(base) + offset; 169 if (!pfn_valid(pfn)) 170 return NULL; 171 return pfn_to_page(pfn); 172 } 173 return iter + 1; 174} 175 176/* 177 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, 178 * so all functions starting at paging_init should be marked __init 179 * in those cases. SPARSEMEM, however, allows for memory hotplug, 180 * and alloc_bootmem_node is not used. 181 */ 182#ifdef CONFIG_SPARSEMEM 183#define __paginginit __meminit 184#else 185#define __paginginit __init 186#endif 187 188/* Memory initialisation debug and verification */ 189enum mminit_level { 190 MMINIT_WARNING, 191 MMINIT_VERIFY, 192 MMINIT_TRACE 193}; 194 195#ifdef CONFIG_DEBUG_MEMORY_INIT 196 197extern int mminit_loglevel; 198 199#define mminit_dprintk(level, prefix, fmt, arg...) \ 200do { \ 201 if (level < mminit_loglevel) { \ 202 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ 203 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ 204 } \ 205} while (0) 206 207extern void mminit_verify_pageflags_layout(void); 208extern void mminit_verify_page_links(struct page *page, 209 enum zone_type zone, unsigned long nid, unsigned long pfn); 210extern void mminit_verify_zonelist(void); 211 212#else 213 214static inline void mminit_dprintk(enum mminit_level level, 215 const char *prefix, const char *fmt, ...) 216{ 217} 218 219static inline void mminit_verify_pageflags_layout(void) 220{ 221} 222 223static inline void mminit_verify_page_links(struct page *page, 224 enum zone_type zone, unsigned long nid, unsigned long pfn) 225{ 226} 227 228static inline void mminit_verify_zonelist(void) 229{ 230} 231#endif /* CONFIG_DEBUG_MEMORY_INIT */ 232 233/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ 234#if defined(CONFIG_SPARSEMEM) 235extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, 236 unsigned long *end_pfn); 237#else 238static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, 239 unsigned long *end_pfn) 240{ 241} 242#endif /* CONFIG_SPARSEMEM */ 243 244int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, 245 unsigned long start, int len, unsigned int foll_flags, 246 struct page **pages, struct vm_area_struct **vmas); 247 248#define ZONE_RECLAIM_NOSCAN -2 249#define ZONE_RECLAIM_FULL -1 250#define ZONE_RECLAIM_SOME 0 251#define ZONE_RECLAIM_SUCCESS 1 252#endif 253 254extern int hwpoison_filter(struct page *p); 255 256extern u32 hwpoison_filter_dev_major; 257extern u32 hwpoison_filter_dev_minor; 258extern u64 hwpoison_filter_flags_mask; 259extern u64 hwpoison_filter_flags_value; 260extern u64 hwpoison_filter_memcg; 261