From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 14 Jan 2009 14:36:26 +0000 (+0100)
Subject: mutex: preemption fixes
X-Git-Tag: v2.6.30-rc1~216^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41719b03091911028116155deddc5eedf8c45e37;p=pandora-kernel.git

mutex: preemption fixes

The problem is that dropping the spinlock right before schedule is a voluntary
preemption point and can cause a schedule, right after which we schedule again.

Fix this inefficiency by keeping preemption disabled until we schedule, do this
by explicity disabling preemption and providing a schedule() variant that
assumes preemption is already disabled.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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