mm/internal.h

   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 extern void __free_pages_bootmem(struct page *page, unsigned int order);
  43
  44 /*
  45  * function for dealing with page's order in buddy system.
  46  * zone->lock is already acquired when we use these.
  47  * So, we don't need atomic page->flags operations here.
  48  */
  49 static inline unsigned long page_order(struct page *page)
  50 {
  51         VM_BUG_ON(!PageBuddy(page));
  52         return page_private(page);
  53 }
  54
  55 /*
  56  * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
  57  * so all functions starting at paging_init should be marked __init
  58  * in those cases. SPARSEMEM, however, allows for memory hotplug,
  59  * and alloc_bootmem_node is not used.
  60  */
  61 #ifdef CONFIG_SPARSEMEM
  62 #define __paginginit __meminit
  63 #else
  64 #define __paginginit __init
  65 #endif
  66
  67 /* Memory initialisation debug and verification */
  68 enum mminit_level {
  69         MMINIT_WARNING,
  70         MMINIT_VERIFY,
  71         MMINIT_TRACE
  72 };
  73
  74 #ifdef CONFIG_DEBUG_MEMORY_INIT
  75
  76 extern int mminit_loglevel;
  77
  78 #define mminit_dprintk(level, prefix, fmt, arg...) \
  79 do { \
  80         if (level < mminit_loglevel) { \
  81                 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
  82                 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
  83         } \
  84 } while (0)
  85
  86 extern void mminit_verify_pageflags_layout(void);
  87 extern void mminit_verify_page_links(struct page *page,
  88                 enum zone_type zone, unsigned long nid, unsigned long pfn);
  89 extern void mminit_verify_zonelist(void);
  90
  91 #else
  92
  93 static inline void mminit_dprintk(enum mminit_level level,
  94                                 const char *prefix, const char *fmt, ...)
  95 {
  96 }
  97
  98 static inline void mminit_verify_pageflags_layout(void)
  99 {
 100 }
 101
 102 static inline void mminit_verify_page_links(struct page *page,
 103                 enum zone_type zone, unsigned long nid, unsigned long pfn)
 104 {
 105 }
 106
 107 static inline void mminit_verify_zonelist(void)
 108 {
 109 }
 110 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 111
 112 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
 113 #if defined(CONFIG_SPARSEMEM)
 114 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 115                                 unsigned long *end_pfn);
 116 #else
 117 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 118                                 unsigned long *end_pfn)
 119 {
 120 }
 121 #endif /* CONFIG_SPARSEMEM */
 122
 123 #endif