Messages in this thread Patch in this message | | | From | Andy Whitcroft <> | Subject | [PATCH 2/3] slub: record page flag overlays explicitly | Date | Thu, 15 May 2008 18:19:59 +0100 |
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SLUB reuses two page bits for internal purposes, it overlays PG_active and PG_error. This is hidden away in slub.c. Document these overlays explicitly in the main page-flags enum along with all the others.
Signed-off-by: Andy Whitcroft <apw@shadowen.org> --- include/linux/page-flags.h | 4 ++++ mm/slub.c | 4 ++-- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 2cc1fb1..2e88df6 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -103,6 +103,10 @@ enum pageflags { /* XEN */ PG_pinned = PG_owner_priv_1, + + /* SLUB */ + PG_slub_frozen = PG_active, + PG_slub_debug = PG_error, }; #ifndef __GENERATING_BOUNDS_H diff --git a/mm/slub.c b/mm/slub.c index a505a82..fd7c61a 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -102,10 +102,10 @@ * the fast path and disables lockless freelists. */ -#define FROZEN (1 << PG_active) +#define FROZEN (1 << PG_slub_frozen) #ifdef CONFIG_SLUB_DEBUG -#define SLABDEBUG (1 << PG_error) +#define SLABDEBUG (1 << PG_slub_debug) #else #define SLABDEBUG 0 #endif
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