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