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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
16static 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 */
25static inline void set_page_refcounted(struct page *page)
26{
27 VM_BUG_ON(PageTail(page));
28 VM_BUG_ON(atomic_read(&page->_count));
29 set_page_count(page, 1);
30}
31
32static inline void __put_page(struct page *page)
33{
34 atomic_dec(&page->_count);
35}
36
37extern void __init __free_pages_bootmem(struct page *page,
38 unsigned int order);
39
40/*
41 * function for dealing with page's order in buddy system.
42 * zone->lock is already acquired when we use these.
43 * So, we don't need atomic page->flags operations here.
44 */
45static inline unsigned long page_order(struct page *page)
46{
47 VM_BUG_ON(!PageBuddy(page));
48 return page_private(page);
49}
50
51/*
52 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
53 * so all functions starting at paging_init should be marked __init
54 * in those cases. SPARSEMEM, however, allows for memory hotplug,
55 * and alloc_bootmem_node is not used.
56 */
57#ifdef CONFIG_SPARSEMEM
58#define __paginginit __meminit
59#else
60#define __paginginit __init
61#endif
62
63#endif