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 16 void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, 17 unsigned long floor, unsigned long ceiling); 18 19 static 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 */ 28 static 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 35 static inline void __put_page(struct page *page) 36 { 37 atomic_dec(&page->_count); 38 } 39 40 extern unsigned long highest_memmap_pfn; 41 42 /* 43 * in mm/vmscan.c: 44 */ 45 extern int isolate_lru_page(struct page *page); 46 extern void putback_lru_page(struct page *page); 47 48 /* 49 * in mm/page_alloc.c 50 */ 51 extern void __free_pages_bootmem(struct page *page, unsigned int order); 52 extern void prep_compound_page(struct page *page, unsigned long order); 53 #ifdef CONFIG_MEMORY_FAILURE 54 extern 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 */ 63 static inline unsigned long page_order(struct page *page) 64 { 65 /* PageBuddy() must be checked by the caller */ 66 return page_private(page); 67 } 68 69 /* mm/util.c */ 70 void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, 71 struct vm_area_struct *prev, struct rb_node *rb_parent); 72 73 #ifdef CONFIG_MMU 74 extern long mlock_vma_pages_range(struct vm_area_struct *vma, 75 unsigned long start, unsigned long end); 76 extern void munlock_vma_pages_range(struct vm_area_struct *vma, 77 unsigned long start, unsigned long end); 78 static inline void munlock_vma_pages_all(struct vm_area_struct *vma) 79 { 80 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); 81 } 82 83 /* 84 * Called only in fault path via page_evictable() for a new page 85 * to determine if it's being mapped into a LOCKED vma. 86 * If so, mark page as mlocked. 87 */ 88 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) 89 { 90 VM_BUG_ON(PageLRU(page)); 91 92 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) 93 return 0; 94 95 if (!TestSetPageMlocked(page)) { 96 inc_zone_page_state(page, NR_MLOCK); 97 count_vm_event(UNEVICTABLE_PGMLOCKED); 98 } 99 return 1; 100 } 101 102 /* 103 * must be called with vma's mmap_sem held for read or write, and page locked. 104 */ 105 extern void mlock_vma_page(struct page *page); 106 extern void munlock_vma_page(struct page *page); 107 108 /* 109 * Clear the page's PageMlocked(). This can be useful in a situation where 110 * we want to unconditionally remove a page from the pagecache -- e.g., 111 * on truncation or freeing. 112 * 113 * It is legal to call this function for any page, mlocked or not. 114 * If called for a page that is still mapped by mlocked vmas, all we do 115 * is revert to lazy LRU behaviour -- semantics are not broken. 116 */ 117 extern void __clear_page_mlock(struct page *page); 118 static inline void clear_page_mlock(struct page *page) 119 { 120 if (unlikely(TestClearPageMlocked(page))) 121 __clear_page_mlock(page); 122 } 123 124 /* 125 * mlock_migrate_page - called only from migrate_page_copy() to 126 * migrate the Mlocked page flag; update statistics. 127 */ 128 static inline void mlock_migrate_page(struct page *newpage, struct page *page) 129 { 130 if (TestClearPageMlocked(page)) { 131 unsigned long flags; 132 133 local_irq_save(flags); 134 __dec_zone_page_state(page, NR_MLOCK); 135 SetPageMlocked(newpage); 136 __inc_zone_page_state(newpage, NR_MLOCK); 137 local_irq_restore(flags); 138 } 139 } 140 141 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 142 extern unsigned long vma_address(struct page *page, 143 struct vm_area_struct *vma); 144 #endif 145 #else /* !CONFIG_MMU */ 146 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) 147 { 148 return 0; 149 } 150 static inline void clear_page_mlock(struct page *page) { } 151 static inline void mlock_vma_page(struct page *page) { } 152 static inline void mlock_migrate_page(struct page *new, struct page *old) { } 153 154 #endif /* !CONFIG_MMU */ 155 156 /* 157 * Return the mem_map entry representing the 'offset' subpage within 158 * the maximally aligned gigantic page 'base'. Handle any discontiguity 159 * in the mem_map at MAX_ORDER_NR_PAGES boundaries. 160 */ 161 static inline struct page *mem_map_offset(struct page *base, int offset) 162 { 163 if (unlikely(offset >= MAX_ORDER_NR_PAGES)) 164 return pfn_to_page(page_to_pfn(base) + offset); 165 return base + offset; 166 } 167 168 /* 169 * Iterator over all subpages within the maximally aligned gigantic 170 * page 'base'. Handle any discontiguity in the mem_map. 171 */ 172 static inline struct page *mem_map_next(struct page *iter, 173 struct page *base, int offset) 174 { 175 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { 176 unsigned long pfn = page_to_pfn(base) + offset; 177 if (!pfn_valid(pfn)) 178 return NULL; 179 return pfn_to_page(pfn); 180 } 181 return iter + 1; 182 } 183 184 /* 185 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, 186 * so all functions starting at paging_init should be marked __init 187 * in those cases. SPARSEMEM, however, allows for memory hotplug, 188 * and alloc_bootmem_node is not used. 189 */ 190 #ifdef CONFIG_SPARSEMEM 191 #define __paginginit __meminit 192 #else 193 #define __paginginit __init 194 #endif 195 196 /* Memory initialisation debug and verification */ 197 enum mminit_level { 198 MMINIT_WARNING, 199 MMINIT_VERIFY, 200 MMINIT_TRACE 201 }; 202 203 #ifdef CONFIG_DEBUG_MEMORY_INIT 204 205 extern int mminit_loglevel; 206 207 #define mminit_dprintk(level, prefix, fmt, arg...) \ 208 do { \ 209 if (level < mminit_loglevel) { \ 210 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ 211 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ 212 } \ 213 } while (0) 214 215 extern void mminit_verify_pageflags_layout(void); 216 extern void mminit_verify_page_links(struct page *page, 217 enum zone_type zone, unsigned long nid, unsigned long pfn); 218 extern void mminit_verify_zonelist(void); 219 220 #else 221 222 static inline void mminit_dprintk(enum mminit_level level, 223 const char *prefix, const char *fmt, ...) 224 { 225 } 226 227 static inline void mminit_verify_pageflags_layout(void) 228 { 229 } 230 231 static inline void mminit_verify_page_links(struct page *page, 232 enum zone_type zone, unsigned long nid, unsigned long pfn) 233 { 234 } 235 236 static inline void mminit_verify_zonelist(void) 237 { 238 } 239 #endif /* CONFIG_DEBUG_MEMORY_INIT */ 240 241 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ 242 #if defined(CONFIG_SPARSEMEM) 243 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, 244 unsigned long *end_pfn); 245 #else 246 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, 247 unsigned long *end_pfn) 248 { 249 } 250 #endif /* CONFIG_SPARSEMEM */ 251 252 #define ZONE_RECLAIM_NOSCAN -2 253 #define ZONE_RECLAIM_FULL -1 254 #define ZONE_RECLAIM_SOME 0 255 #define ZONE_RECLAIM_SUCCESS 1 256 #endif 257 258 extern int hwpoison_filter(struct page *p); 259 260 extern u32 hwpoison_filter_dev_major; 261 extern u32 hwpoison_filter_dev_minor; 262 extern u64 hwpoison_filter_flags_mask; 263 extern u64 hwpoison_filter_flags_value; 264 extern u64 hwpoison_filter_memcg; 265 extern u32 hwpoison_filter_enable; 266