From: Nick Piggin <npiggin@suse.de>
Date: Fri, 19 Oct 2007 05:13:02 +0000 (+0200)
Subject: x86: lock bitops
X-Git-Tag: v2.6.24-rc1~18^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=418ccbe37f70f5021c4cd1cdcb0ce7f98d05f2dd;p=pandora-kernel.git

x86: lock bitops

I missed an obvious one!

x86 CPUs are defined not to reorder stores past earlier loads, so there is
no hardware memory barrier required to implement a release-consistent store
(all stores are, by definition).

So ditch the generic lock bitops, and implement optimised versions for x86,
which removes the mfence from __clear_bit_unlock (which is already a useful
primitive for SLUB).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

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