internal.h revision d85f33855c303acfa87fa457157cef755b6087df 
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(PageCompound(page) && 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 fastcall __init __free_pages_bootmem(struct page *page,
38						unsigned int order);
39
40#endif
41