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SLUB: Fix __GFP_ZERO unlikely() annotation

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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

Acked-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Pekka Enberg 2009-11-25 20:14:48 +02:00
parent b419148e56
commit 74e2134ff8
1 changed files with 1 additions and 1 deletions
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2
mm/slub.c
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@ -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);