From: Stephane Eranian <eranian@google.com>
Date: Wed, 23 Apr 2014 17:04:19 +0000 (+0200)
Subject: perf/x86: Fix RAPL rdmsrl_safe() usage
X-Git-Tag: omap-for-v3.16/pm-signed~27^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9f7ff8931e3c5ddc8535476971ec9501e9555c05;p=pandora-kernel.git

perf/x86: Fix RAPL rdmsrl_safe() usage

This patch fixes a bug introduced by:

  24223657806a ("perf/x86/intel: Use rdmsrl_safe() when initializing RAPL PMU")

The rdmsrl_safe() function returns 0 on success.
The current code was failing to detect the RAPL PMU
on real hardware  (missing /sys/devices/power) because
the return value of rdmsrl_safe() was misinterpreted.

Signed-off-by: Stephane Eranian <eranian@google.com>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Venkatesh Srinivas <venkateshs@google.com>
Cc: peterz@infradead.org
Cc: zheng.z.yan@intel.com
Link: http://lkml.kernel.org/r/20140423170418.GA12767@quad
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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