From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 23 Sep 2013 10:59:56 +0000 (+0200)
Subject: lockref: use arch_mutex_cpu_relax() in CMPXCHG_LOOP()
X-Git-Tag: v3.12-rc3~14^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=491f6f8e5fd9a57aaf03b6d6e3e153f1c27d8a46;p=pandora-kernel.git

lockref: use arch_mutex_cpu_relax() in CMPXCHG_LOOP()

Make use of arch_mutex_cpu_relax() so architectures can override the
default cpu_relax() semantics.
This is especially useful for s390, where cpu_relax() means that we
yield() the current (virtual) cpu and therefore is very expensive,
and would contradict the whole purpose of the lockless cmpxchg loop.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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