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/* internal.h: mm/ internal definitions
*
* Copyright ( C ) 2004 Red Hat , Inc . All Rights Reserved .
* Written by David Howells ( dhowells @ redhat . com )
*
* This program is free software ; you can redistribute it and / or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation ; either version
* 2 of the License , or ( at your option ) any later version .
*/
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# ifndef __MM_INTERNAL_H
# define __MM_INTERNAL_H
# 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 ) ;
}
/*
* Turn a non - refcounted page ( - > _count = = 0 ) into refcounted with
* a count of one .
*/
static inline void set_page_refcounted ( struct page * page )
{
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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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static inline void __put_page ( struct page * page )
{
atomic_dec ( & page - > _count ) ;
}
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extern void fastcall __init __free_pages_bootmem ( struct page * page ,
unsigned int order ) ;
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/*
* function for dealing with page ' s order in buddy system .
* zone - > lock is already acquired when we use these .
* So , we don ' t need atomic page - > flags operations here .
*/
static inline unsigned long page_order ( struct page * page )
{
VM_BUG_ON ( ! PageBuddy ( page ) ) ;
return page_private ( page ) ;
}
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# endif