From: Will Deacon <will.deacon@arm.com>
Date: Tue, 21 Jan 2014 23:36:10 +0000 (-0800)
Subject: locking/mcs: Allow architectures to hook in to contended paths
X-Git-Tag: v3.15-rc1~184^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e207552e64ea053a33e856828ad7915484911d06;p=pandora-kernel.git

locking/mcs: Allow architectures to hook in to contended paths

When contended, architectures may be able to reduce the polling overhead
in ways which aren't expressible using a simple relax() primitive.

This patch allows architectures to hook into the mcs_{lock,unlock}
functions for the contended cases only.

Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1390347370.3138.65.camel@schen9-DESK
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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