1 /* internal.h: mm/ internal definitions
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
11 #ifndef __MM_INTERNAL_H
12 #define __MM_INTERNAL_H
16 void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
19 static inline void set_page_count(struct page *page, int v)
21 atomic_set(&page->_count, v);
25 * Turn a non-refcounted page (->_count == 0) into refcounted with
28 static inline void set_page_refcounted(struct page *page)
30 VM_BUG_ON(PageTail(page));
31 VM_BUG_ON(atomic_read(&page->_count));
32 set_page_count(page, 1);
35 static inline void __put_page(struct page *page)
37 atomic_dec(&page->_count);
43 extern int isolate_lru_page(struct page *page);
44 extern void putback_lru_page(struct page *page);
49 extern unsigned long highest_memmap_pfn;
50 extern void __free_pages_bootmem(struct page *page, unsigned int order);
51 extern void prep_compound_page(struct page *page, unsigned long order);
55 * function for dealing with page's order in buddy system.
56 * zone->lock is already acquired when we use these.
57 * So, we don't need atomic page->flags operations here.
59 static inline unsigned long page_order(struct page *page)
61 VM_BUG_ON(!PageBuddy(page));
62 return page_private(page);
65 #ifdef CONFIG_HAVE_MLOCK
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)
72 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
76 #ifdef CONFIG_UNEVICTABLE_LRU
78 * unevictable_migrate_page() called only from migrate_page_copy() to
79 * migrate unevictable flag to new page.
80 * Note that the old page has been isolated from the LRU lists at this
81 * point so we don't need to worry about LRU statistics.
83 static inline void unevictable_migrate_page(struct page *new, struct page *old)
85 if (TestClearPageUnevictable(old))
86 SetPageUnevictable(new);
89 static inline void unevictable_migrate_page(struct page *new, struct page *old)
94 #ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
96 * Called only in fault path via page_evictable() for a new page
97 * to determine if it's being mapped into a LOCKED vma.
98 * If so, mark page as mlocked.
100 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
102 VM_BUG_ON(PageLRU(page));
104 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
107 if (!TestSetPageMlocked(page)) {
108 inc_zone_page_state(page, NR_MLOCK);
109 count_vm_event(UNEVICTABLE_PGMLOCKED);
115 * must be called with vma's mmap_sem held for read, and page locked.
117 extern void mlock_vma_page(struct page *page);
120 * Clear the page's PageMlocked(). This can be useful in a situation where
121 * we want to unconditionally remove a page from the pagecache -- e.g.,
122 * on truncation or freeing.
124 * It is legal to call this function for any page, mlocked or not.
125 * If called for a page that is still mapped by mlocked vmas, all we do
126 * is revert to lazy LRU behaviour -- semantics are not broken.
128 extern void __clear_page_mlock(struct page *page);
129 static inline void clear_page_mlock(struct page *page)
131 if (unlikely(TestClearPageMlocked(page)))
132 __clear_page_mlock(page);
136 * mlock_migrate_page - called only from migrate_page_copy() to
137 * migrate the Mlocked page flag; update statistics.
139 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
141 if (TestClearPageMlocked(page)) {
144 local_irq_save(flags);
145 __dec_zone_page_state(page, NR_MLOCK);
146 SetPageMlocked(newpage);
147 __inc_zone_page_state(newpage, NR_MLOCK);
148 local_irq_restore(flags);
152 #else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
153 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
157 static inline void clear_page_mlock(struct page *page) { }
158 static inline void mlock_vma_page(struct page *page) { }
159 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
161 #endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
164 * Return the mem_map entry representing the 'offset' subpage within
165 * the maximally aligned gigantic page 'base'. Handle any discontiguity
166 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
168 static inline struct page *mem_map_offset(struct page *base, int offset)
170 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
171 return pfn_to_page(page_to_pfn(base) + offset);
172 return base + offset;
176 * Iterator over all subpages withing the maximally aligned gigantic
177 * page 'base'. Handle any discontiguity in the mem_map.
179 static inline struct page *mem_map_next(struct page *iter,
180 struct page *base, int offset)
182 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
183 unsigned long pfn = page_to_pfn(base) + offset;
186 return pfn_to_page(pfn);
192 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
193 * so all functions starting at paging_init should be marked __init
194 * in those cases. SPARSEMEM, however, allows for memory hotplug,
195 * and alloc_bootmem_node is not used.
197 #ifdef CONFIG_SPARSEMEM
198 #define __paginginit __meminit
200 #define __paginginit __init
203 /* Memory initialisation debug and verification */
210 #ifdef CONFIG_DEBUG_MEMORY_INIT
212 extern int mminit_loglevel;
214 #define mminit_dprintk(level, prefix, fmt, arg...) \
216 if (level < mminit_loglevel) { \
217 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
218 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
222 extern void mminit_verify_pageflags_layout(void);
223 extern void mminit_verify_page_links(struct page *page,
224 enum zone_type zone, unsigned long nid, unsigned long pfn);
225 extern void mminit_verify_zonelist(void);
229 static inline void mminit_dprintk(enum mminit_level level,
230 const char *prefix, const char *fmt, ...)
234 static inline void mminit_verify_pageflags_layout(void)
238 static inline void mminit_verify_page_links(struct page *page,
239 enum zone_type zone, unsigned long nid, unsigned long pfn)
243 static inline void mminit_verify_zonelist(void)
246 #endif /* CONFIG_DEBUG_MEMORY_INIT */
248 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
249 #if defined(CONFIG_SPARSEMEM)
250 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
251 unsigned long *end_pfn);
253 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
254 unsigned long *end_pfn)
257 #endif /* CONFIG_SPARSEMEM */
259 #define GUP_FLAGS_WRITE 0x1
260 #define GUP_FLAGS_FORCE 0x2
261 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
262 #define GUP_FLAGS_IGNORE_SIGKILL 0x8
264 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
265 unsigned long start, int len, int flags,
266 struct page **pages, struct vm_area_struct **vmas);