From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 19 May 2015 00:00:55 +0000 (+0000)
Subject: perf/x86/intel/cqm: Avoid pointless MSR write
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~210^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bac237845e203dd1439cfc571b1baf1b2274b3b;p=pandora-kernel.git

perf/x86/intel/cqm: Avoid pointless MSR write

If the usage counter is non-zero there is no point to update the rmid
in the PQR MSR.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Matt Fleming <matt.fleming@intel.com>
Cc: Kanaka Juvva <kanaka.d.juvva@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Cc: Will Auld <will.auld@intel.com>
Link: http://lkml.kernel.org/r/20150518235150.080844281@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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