release/src-rt-6.x/linux/linux-2.6/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 static inline void set_page_count(struct page *page, int v)
  17 {
  18         atomic_set(&page->_count, v);
  19 }
  20
  21 /*
  22  * Turn a non-refcounted page (->_count == 0) into refcounted with
  23  * a count of one.
  24  */
  25 static inline void set_page_refcounted(struct page *page)
  26 {
  27         VM_BUG_ON(PageCompound(page) && PageTail(page));
  28         VM_BUG_ON(atomic_read(&page->_count));
  29         set_page_count(page, 1);
  30 }
  31
  32 static inline void __put_page(struct page *page)
  33 {
  34         atomic_dec(&page->_count);
  35 }
  36
  37 extern void fastcall __init __free_pages_bootmem(struct page *page,
  38                                                 unsigned int order);
  39
  40 /* Memory initialisation debug and verification */
  41 enum mminit_level {
  42         MMINIT_WARNING,
  43         MMINIT_VERIFY,
  44         MMINIT_TRACE
  45 };
  46
  47 #ifdef CONFIG_DEBUG_MEMORY_INIT
  48
  49 extern int mminit_loglevel;
  50
  51 #define mminit_dprintk(level, prefix, fmt, arg...) \
  52 do { \
  53         if (level < mminit_loglevel) { \
  54                 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
  55                 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
  56         } \
  57 } while (0)
  58
  59 #else
  60
  61 static inline void mminit_dprintk(enum mminit_level level,
  62                                 const char *prefix, const char *fmt, ...)
  63 {
  64 }
  65 #endif /* CONFIG_DEBUG_MEMORY_INIT */
  66
  67 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
  68 #if defined(CONFIG_SPARSEMEM)
  69 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
  70                                 unsigned long *end_pfn);
  71 #else
  72 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
  73                                 unsigned long *end_pfn)
  74 {
  75 }
  76 #endif /* CONFIG_SPARSEMEM */
  77
  78 #endif