Merge remote-tracking branch 'lsk/v3.10/topic/gator' into linux-linaro-lsk

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kernel / cpu / perf_event_intel.c

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index f60d41ff9a97fba11bf28808a65ed775e1605666..b45ac6affa9ce47c8eb108f81678ce5c116feeed 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -165,13 +165,13 @@ static struct extra_reg intel_snb_extra_regs[] __read_mostly = {
        INTEL_EVENT_EXTRA_REG(0xb7, MSR_OFFCORE_RSP_0, 0x3f807f8fffull, RSP_0),
        INTEL_EVENT_EXTRA_REG(0xbb, MSR_OFFCORE_RSP_1, 0x3f807f8fffull, RSP_1),
        INTEL_UEVENT_PEBS_LDLAT_EXTRA_REG(0x01cd),
-       INTEL_UEVENT_PEBS_LDLAT_EXTRA_REG(0x01cd),
        EVENT_EXTRA_END
 };
 
 static struct extra_reg intel_snbep_extra_regs[] __read_mostly = {
        INTEL_EVENT_EXTRA_REG(0xb7, MSR_OFFCORE_RSP_0, 0x3fffff8fffull, RSP_0),
        INTEL_EVENT_EXTRA_REG(0xbb, MSR_OFFCORE_RSP_1, 0x3fffff8fffull, RSP_1),
+       INTEL_UEVENT_PEBS_LDLAT_EXTRA_REG(0x01cd),
        EVENT_EXTRA_END
 };
 
@@ -1198,6 +1198,15 @@ again:
 
        intel_pmu_lbr_read();
 
+       /*
+        * CondChgd bit 63 doesn't mean any overflow status. Ignore
+        * and clear the bit.
+        */
+       if (__test_and_clear_bit(63, (unsigned long *)&status)) {
+               if (!status)
+                       goto done;
+       }
+
        /*
         * PEBS overflow sets bit 62 in the global status register
         */