[tip:perf/urgent] perf/x86: Fix RAPL rdmsrl_safe() usage

tip-bot for Stephane Eranian
2014-04-24T08:04:08Z

Commit-ID: 9f7ff8931e3c5ddc8535476971ec9501e9555c05
Gitweb: http://git.kernel.org/tip/9f7ff8931e3c5ddc8535476971ec9501e9555c05
Author: Stephane Eranian <eranian@google.com>
AuthorDate: Wed, 23 Apr 2014 19:04:19 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 24 Apr 2014 08:12:41 +0200

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>
---
arch/x86/kernel/cpu/perf_event_intel_rapl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
index 7c87424..619f769 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -543,7 +543,8 @@ static int rapl_cpu_prepare(int cpu)
if (phys_id < 0)
return -1;

- if (!rdmsrl_safe(MSR_RAPL_POWER_UNIT, &msr_rapl_power_unit_bits))
+ /* protect rdmsrl() to handle virtualization */
+ if (rdmsrl_safe(MSR_RAPL_POWER_UNIT, &msr_rapl_power_unit_bits))
return -1;

pmu = kzalloc_node(sizeof(*pmu), GFP_KERNEL, cpu_to_node(cpu));