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 extern void prep_compound_page(struct page *page, unsigned long order); 20 extern void prep_compound_gigantic_page(struct page *page, unsigned long order); 21 22 static inline void set_page_count(struct page *page, int v) 23 { 24 atomic_set(&page->_count, v); 25 } 26 27 /* 28 * Turn a non-refcounted page (->_count == 0) into refcounted with 29 * a count of one. 30 */ 31 static inline void set_page_refcounted(struct page *page) 32 { 33 VM_BUG_ON(PageTail(page)); 34 VM_BUG_ON(atomic_read(&page->_count)); 35 set_page_count(page, 1); 36 } 37 38 static inline void __put_page(struct page *page) 39 { 40 atomic_dec(&page->_count); 41 } 42 43 /* 44 * in mm/vmscan.c: 45 */ 46 extern int isolate_lru_page(struct page *page); 47 extern void putback_lru_page(struct page *page); 48 49 /* 50 * in mm/page_alloc.c 51 */ 52 extern unsigned long highest_memmap_pfn; 53 extern void __free_pages_bootmem(struct page *page, unsigned int order); 54 55 /* 56 * function for dealing with page's order in buddy system. 57 * zone->lock is already acquired when we use these. 58 * So, we don't need atomic page->flags operations here. 59 */ 60 static inline unsigned long page_order(struct page *page) 61 { 62 VM_BUG_ON(!PageBuddy(page)); 63 return page_private(page); 64 } 65 66 extern long mlock_vma_pages_range(struct vm_area_struct *vma, 67 unsigned long start, unsigned long end); 68 extern void munlock_vma_pages_range(struct vm_area_struct *vma, 69 unsigned long start, unsigned long end); 70 static inline void munlock_vma_pages_all(struct vm_area_struct *vma) 71 { 72 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); 73 } 74 75 #ifdef CONFIG_UNEVICTABLE_LRU 76 /* 77 * unevictable_migrate_page() called only from migrate_page_copy() to 78 * migrate unevictable flag to new page. 79 * Note that the old page has been isolated from the LRU lists at this 80 * point so we don't need to worry about LRU statistics. 81 */ 82 static inline void unevictable_migrate_page(struct page *new, struct page *old) 83 { 84 if (TestClearPageUnevictable(old)) 85 SetPageUnevictable(new); 86 } 87 #else 88 static inline void unevictable_migrate_page(struct page *new, struct page *old) 89 { 90 } 91 #endif 92 93 #ifdef CONFIG_UNEVICTABLE_LRU 94 /* 95 * Called only in fault path via page_evictable() for a new page 96 * to determine if it's being mapped into a LOCKED vma. 97 * If so, mark page as mlocked. 98 */ 99 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) 100 { 101 VM_BUG_ON(PageLRU(page)); 102 103 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) 104 return 0; 105 106 if (!TestSetPageMlocked(page)) { 107 inc_zone_page_state(page, NR_MLOCK); 108 count_vm_event(UNEVICTABLE_PGMLOCKED); 109 } 110 return 1; 111 } 112 113 /* 114 * must be called with vma's mmap_sem held for read, and page locked. 115 */ 116 extern void mlock_vma_page(struct page *page); 117 118 /* 119 * Clear the page's PageMlocked(). This can be useful in a situation where 120 * we want to unconditionally remove a page from the pagecache -- e.g., 121 * on truncation or freeing. 122 * 123 * It is legal to call this function for any page, mlocked or not. 124 * If called for a page that is still mapped by mlocked vmas, all we do 125 * is revert to lazy LRU behaviour -- semantics are not broken. 126 */ 127 extern void __clear_page_mlock(struct page *page); 128 static inline void clear_page_mlock(struct page *page) 129 { 130 if (unlikely(TestClearPageMlocked(page))) 131 __clear_page_mlock(page); 132 } 133 134 /* 135 * mlock_migrate_page - called only from migrate_page_copy() to 136 * migrate the Mlocked page flag; update statistics. 137 */ 138 static inline void mlock_migrate_page(struct page *newpage, struct page *page) 139 { 140 if (TestClearPageMlocked(page)) { 141 unsigned long flags; 142 143 local_irq_save(flags); 144 __dec_zone_page_state(page, NR_MLOCK); 145 SetPageMlocked(newpage); 146 __inc_zone_page_state(newpage, NR_MLOCK); 147 local_irq_restore(flags); 148 } 149 } 150 151 /* 152 * free_page_mlock() -- clean up attempts to free and mlocked() page. 153 * Page should not be on lru, so no need to fix that up. 154 * free_pages_check() will verify... 155 */ 156 static inline void free_page_mlock(struct page *page) 157 { 158 if (unlikely(TestClearPageMlocked(page))) { 159 unsigned long flags; 160 161 local_irq_save(flags); 162 __dec_zone_page_state(page, NR_MLOCK); 163 __count_vm_event(UNEVICTABLE_MLOCKFREED); 164 local_irq_restore(flags); 165 } 166 } 167 168 #else /* CONFIG_UNEVICTABLE_LRU */ 169 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) 170 { 171 return 0; 172 } 173 static inline void clear_page_mlock(struct page *page) { } 174 static inline void mlock_vma_page(struct page *page) { } 175 static inline void mlock_migrate_page(struct page *new, struct page *old) { } 176 static inline void free_page_mlock(struct page *page) { } 177 178 #endif /* CONFIG_UNEVICTABLE_LRU */ 179 180 /* 181 * Return the mem_map entry representing the 'offset' subpage within 182 * the maximally aligned gigantic page 'base'. Handle any discontiguity 183 * in the mem_map at MAX_ORDER_NR_PAGES boundaries. 184 */ 185 static inline struct page *mem_map_offset(struct page *base, int offset) 186 { 187 if (unlikely(offset >= MAX_ORDER_NR_PAGES)) 188 return pfn_to_page(page_to_pfn(base) + offset); 189 return base + offset; 190 } 191 192 /* 193 * Iterator over all subpages withing the maximally aligned gigantic 194 * page 'base'. Handle any discontiguity in the mem_map. 195 */ 196 static inline struct page *mem_map_next(struct page *iter, 197 struct page *base, int offset) 198 { 199 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { 200 unsigned long pfn = page_to_pfn(base) + offset; 201 if (!pfn_valid(pfn)) 202 return NULL; 203 return pfn_to_page(pfn); 204 } 205 return iter + 1; 206 } 207 208 /* 209 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, 210 * so all functions starting at paging_init should be marked __init 211 * in those cases. SPARSEMEM, however, allows for memory hotplug, 212 * and alloc_bootmem_node is not used. 213 */ 214 #ifdef CONFIG_SPARSEMEM 215 #define __paginginit __meminit 216 #else 217 #define __paginginit __init 218 #endif 219 220 /* Memory initialisation debug and verification */ 221 enum mminit_level { 222 MMINIT_WARNING, 223 MMINIT_VERIFY, 224 MMINIT_TRACE 225 }; 226 227 #ifdef CONFIG_DEBUG_MEMORY_INIT 228 229 extern int mminit_loglevel; 230 231 #define mminit_dprintk(level, prefix, fmt, arg...) \ 232 do { \ 233 if (level < mminit_loglevel) { \ 234 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ 235 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ 236 } \ 237 } while (0) 238 239 extern void mminit_verify_pageflags_layout(void); 240 extern void mminit_verify_page_links(struct page *page, 241 enum zone_type zone, unsigned long nid, unsigned long pfn); 242 extern void mminit_verify_zonelist(void); 243 244 #else 245 246 static inline void mminit_dprintk(enum mminit_level level, 247 const char *prefix, const char *fmt, ...) 248 { 249 } 250 251 static inline void mminit_verify_pageflags_layout(void) 252 { 253 } 254 255 static inline void mminit_verify_page_links(struct page *page, 256 enum zone_type zone, unsigned long nid, unsigned long pfn) 257 { 258 } 259 260 static inline void mminit_verify_zonelist(void) 261 { 262 } 263 #endif /* CONFIG_DEBUG_MEMORY_INIT */ 264 265 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ 266 #if defined(CONFIG_SPARSEMEM) 267 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, 268 unsigned long *end_pfn); 269 #else 270 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, 271 unsigned long *end_pfn) 272 { 273 } 274 #endif /* CONFIG_SPARSEMEM */ 275 276 #define GUP_FLAGS_WRITE 0x1 277 #define GUP_FLAGS_FORCE 0x2 278 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4 279 #define GUP_FLAGS_IGNORE_SIGKILL 0x8 280 281 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, 282 unsigned long start, int len, int flags, 283 struct page **pages, struct vm_area_struct **vmas); 284 285 #endif 286