slub: Remove CONFIG_CMPXCHG_LOCAL ifdeffery

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Remove the #ifdefs. This means that the irqsafe_cpu_cmpxchg_double() is used
everywhere.

There may be performance implications since:

A. We now have to manage a transaction ID for all arches

B. The interrupt holdoff for arches not supporting CONFIG_CMPXCHG_LOCAL is reduced
to a very short irqoff section.

There are no multiple irqoff/irqon sequences as a result of this change. Even in the fallback
case we only have to do one disable and enable like before.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

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This commit is contained in:

Christoph Lameter 2011-05-05 15:23:54 -05:00 • committed by Pekka Enberg

parent 8dc16c6c04

commit 1759415e63

2 changed files with 0 additions and 58 deletions

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2

include/linux/slub_def.h

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56

mm/slub.c

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