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authorColin King <colin.king@canonical.com>2017-01-11 11:43:10 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-05 14:40:24 +0200
commitc78b8de5c05c73ff451b7c5a085766b421920ccd (patch)
treebb28f055c04e2effe32a66f4a13fdcad74a10032 /arch
parent6130fac994818eb0fbc9dfc95056292e71fb3791 (diff)
perf/x86/intel: Use ULL constant to prevent undefined shift behaviour
[ Upstream commit ad5013d5699d30ded0cdbbc68b93b2aa28222c6e ] When x86_pmu.num_counters is 32 the shift of the integer constant 1 is exceeding 32bit and therefor undefined behaviour. Fix this by shifting 1ULL instead of 1. Reported-by: CoverityScan CID#1192105 ("Bad bit shift operation") Signed-off-by: Colin Ian King <colin.king@canonical.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Kan Liang <kan.liang@intel.com> Cc: Stephane Eranian <eranian@google.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Link: http://lkml.kernel.org/r/20170111114310.17928-1-colin.king@canonical.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/events/intel/core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 24a6cd24fac4..f0f197f459b5 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3978,7 +3978,7 @@ __init int intel_pmu_init(void)
x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
x86_pmu.num_counters = INTEL_PMC_MAX_GENERIC;
}
- x86_pmu.intel_ctrl = (1 << x86_pmu.num_counters) - 1;
+ x86_pmu.intel_ctrl = (1ULL << x86_pmu.num_counters) - 1;
if (x86_pmu.num_counters_fixed > INTEL_PMC_MAX_FIXED) {
WARN(1, KERN_ERR "hw perf events fixed %d > max(%d), clipping!",