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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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 */
Nick Piggin0f8053a2006-03-22 00:08:33 -080011#ifndef __MM_INTERNAL_H
12#define __MM_INTERNAL_H
13
14#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Nick Piggin7835e982006-03-22 00:08:40 -080016static inline void set_page_count(struct page *page, int v)
Nick Piggin77a8a782006-01-06 00:10:57 -080017{
Nick Piggin7835e982006-03-22 00:08:40 -080018 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{
Qi Yongae1276b2008-02-04 22:29:27 -080027 VM_BUG_ON(PageTail(page));
Nick Piggin725d7042006-09-25 23:30:55 -070028 VM_BUG_ON(atomic_read(&page->_count));
Nick Piggin77a8a782006-01-06 00:10:57 -080029 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080030}
31
Nick Piggin0f8053a2006-03-22 00:08:33 -080032static inline void __put_page(struct page *page)
33{
34 atomic_dec(&page->_count);
35}
36
Harvey Harrison920c7a52008-02-04 22:29:26 -080037extern void __init __free_pages_bootmem(struct page *page,
David Howellsa226f6c2006-01-06 00:11:08 -080038 unsigned int order);
Nick Piggin0f8053a2006-03-22 00:08:33 -080039
Mel Gorman48f13bf2007-10-16 01:26:10 -070040/*
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}
Nick Piggin0f8053a2006-03-22 00:08:33 -080050#endif