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Commit 5577bd8a authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

SLUB: Do our own flags based on PG_active and PG_error 



The atomicity when handling flags in SLUB is not necessary since both flags
used by SLUB are not updated in a racy way.  Flag updates are either done
during slab creation or destruction or under slab_lock.  Some of these flags
do not have the non atomic variants that we need.  So define our own.

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent eefaca9c

mm/slub.c

+14 −14
Original line number Diff line number Diff line
@@ -99,42 +99,42 @@ 
 * 			the fast path and disables lockless freelists.

 */



#define FROZEN (1 << PG_active)



#ifdef CONFIG_SLUB_DEBUG

#define SLABDEBUG (1 << PG_error)

#else

#define SLABDEBUG 0

#endif



static inline int SlabFrozen(struct page *page)

{

	return PageActive(page);

	return page->flags & FROZEN;

}



static inline void SetSlabFrozen(struct page *page)

{

	SetPageActive(page);

	page->flags |= FROZEN;

}



static inline void ClearSlabFrozen(struct page *page)

{

	ClearPageActive(page);

	page->flags &= ~FROZEN;

}



static inline int SlabDebug(struct page *page)

{

#ifdef CONFIG_SLUB_DEBUG

	return PageError(page);

#else

	return 0;

#endif

	return page->flags & SLABDEBUG;

}



static inline void SetSlabDebug(struct page *page)

{

#ifdef CONFIG_SLUB_DEBUG

	SetPageError(page);

#endif

	page->flags |= SLABDEBUG;

}



static inline void ClearSlabDebug(struct page *page)

{

#ifdef CONFIG_SLUB_DEBUG

	ClearPageError(page);

#endif

	page->flags &= ~SLABDEBUG;

}



/*