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Message-Id: <1259173279-21220-1-git-send-email-penberg@cs.helsinki.fi> Date: Wed, 25 Nov 2009 20:21:19 +0200 From: Pekka Enberg <penberg@...helsinki.fi> To: linux-kernel@...r.kernel.org Cc: Pekka Enberg <penberg@...helsinki.fi>, Christoph Lameter <cl@...ux-foundation.org> Subject: [PATCH] SLUB: Fix __GFP_ZERO unlikely() annotation The unlikely() annotation in slab_alloc() covers too much of the expression. It's actually very likely that the object is not NULL so use unlikely() only for the __GFP_ZERO expression like SLAB does. The patch reduces kernel text by 29 bytes on x86-64: text data bss dec hex filename 24185 8560 176 32921 8099 mm/slub.o.orig 24156 8560 176 32892 807c mm/slub.o Cc: Christoph Lameter <cl@...ux-foundation.org> Signed-off-by: Pekka Enberg <penberg@...helsinki.fi> --- mm/slub.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 4996fc7..0956396 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1735,7 +1735,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, } local_irq_restore(flags); - if (unlikely((gfpflags & __GFP_ZERO) && object)) + if (unlikely(gfpflags & __GFP_ZERO) && object) memset(object, 0, objsize); kmemcheck_slab_alloc(s, gfpflags, object, c->objsize); -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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