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48f13bf3e7
The statistics patch later needs to know what order a free page is on the free lists. Rather than having special knowledge of page_private() when PageBuddy() is set, this patch places out page_order() in internal.h and adds a VM_BUG_ON to catch using it on non-PageBuddy pages. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Christoph Lameter <clameter@sgi.com> Acked-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/* internal.h: mm/ internal definitions
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef __MM_INTERNAL_H
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#define __MM_INTERNAL_H
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#include <linux/mm.h>
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static inline void set_page_count(struct page *page, int v)
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{
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atomic_set(&page->_count, v);
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}
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/*
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* Turn a non-refcounted page (->_count == 0) into refcounted with
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* a count of one.
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*/
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static inline void set_page_refcounted(struct page *page)
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{
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VM_BUG_ON(PageCompound(page) && PageTail(page));
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VM_BUG_ON(atomic_read(&page->_count));
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set_page_count(page, 1);
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}
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static inline void __put_page(struct page *page)
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{
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atomic_dec(&page->_count);
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}
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extern void fastcall __init __free_pages_bootmem(struct page *page,
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unsigned int order);
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/*
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* function for dealing with page's order in buddy system.
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* zone->lock is already acquired when we use these.
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* So, we don't need atomic page->flags operations here.
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*/
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static inline unsigned long page_order(struct page *page)
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{
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VM_BUG_ON(!PageBuddy(page));
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return page_private(page);
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}
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#endif
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