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| author | Stephane Eranian <eranian@google.com> | 2015-01-22 21:38:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-01-28 13:04:35 +0100 |
| commit | 98b008dff8452653909d9263efda925873e8d8bb (patch) | |
| tree | 362a1c9e4f888654d04b6b6ea8b5f0efa0492d22 /arch | |
| parent | c05199e5a57a579fea1e8fa65e2b511ceb524ffc (diff) | |
| download | linux-98b008dff8452653909d9263efda925873e8d8bb.tar.gz linux-98b008dff8452653909d9263efda925873e8d8bb.tar.bz2 linux-98b008dff8452653909d9263efda925873e8d8bb.zip | |
perf/rapl: Fix crash in rapl_scale()
This patch fixes a systematic crash in rapl_scale()
due to an invalid pointer.
The bug was introduced by commit:
89cbc76768c2 ("x86: Replace __get_cpu_var uses")
The fix is simple. Just put the parenthesis where it needs
to be, i.e., around rapl_pmu. To my surprise, the compiler
was not complaining about passing an integer instead of a
pointer.
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Tested-by: Vince Weaver <vincent.weaver@maine.edu>
Fixes: 89cbc76768c2 ("x86: Replace __get_cpu_var uses")
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: cl@linux.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20150122203834.GA10228@thinkpad
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel_rapl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c index 6e434f8e5fc8..c4bb8b8e5017 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c +++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c @@ -142,7 +142,7 @@ static inline u64 rapl_scale(u64 v) * or use ldexp(count, -32). * Watts = Joules/Time delta */ - return v << (32 - __this_cpu_read(rapl_pmu->hw_unit)); + return v << (32 - __this_cpu_read(rapl_pmu)->hw_unit); } static u64 rapl_event_update(struct perf_event *event) |