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| author | Markus Metzger <markus.t.metzger@intel.com> | 2014-02-14 16:44:08 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-02-21 22:09:01 +0100 |
| commit | a3ef2229c94ff70998724cb64b9cb4c77db9e950 (patch) | |
| tree | 827839f2c4b9b4f7f8ff7a8533c3967e46cfc744 /arch/x86/kernel | |
| parent | 0e9f2204cfa6d79abe3e525ddf7c4ab5792cc751 (diff) | |
| download | linux-a3ef2229c94ff70998724cb64b9cb4c77db9e950.tar.gz linux-a3ef2229c94ff70998724cb64b9cb4c77db9e950.tar.bz2 linux-a3ef2229c94ff70998724cb64b9cb4c77db9e950.zip | |
perf, nmi: Fix unknown NMI warning
When using BTS on Core i7-4*, I get the below kernel warning.
$ perf record -c 1 -e branches:u ls
Message from syslogd@labpc1501 at Nov 11 15:49:25 ...
kernel:[ 438.317893] Uhhuh. NMI received for unknown reason 31 on CPU 2.
Message from syslogd@labpc1501 at Nov 11 15:49:25 ...
kernel:[ 438.317920] Do you have a strange power saving mode enabled?
Message from syslogd@labpc1501 at Nov 11 15:49:25 ...
kernel:[ 438.317945] Dazed and confused, but trying to continue
Make intel_pmu_handle_irq() take the full exit path when returning early.
Cc: eranian@google.com
Cc: peterz@infradead.org
Cc: mingo@kernel.org
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1392425048-5309-1-git-send-email-andi@firstfloor.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c index 0fa4f242f050..698ae77d6f18 100644 --- a/arch/x86/kernel/cpu/perf_event_intel.c +++ b/arch/x86/kernel/cpu/perf_event_intel.c @@ -1361,10 +1361,8 @@ static int intel_pmu_handle_irq(struct pt_regs *regs) intel_pmu_disable_all(); handled = intel_pmu_drain_bts_buffer(); status = intel_pmu_get_status(); - if (!status) { - intel_pmu_enable_all(0); - return handled; - } + if (!status) + goto done; loops = 0; again: |