summaryrefslogtreecommitdiffstats
path: root/arch
diff options
context:
space:
mode:
authorMarkus Metzger <markus.t.metzger@intel.com>2014-02-14 16:44:08 -0800
committerThomas Gleixner <tglx@linutronix.de>2014-02-21 22:09:01 +0100
commita3ef2229c94ff70998724cb64b9cb4c77db9e950 (patch)
tree827839f2c4b9b4f7f8ff7a8533c3967e46cfc744 /arch
parent0e9f2204cfa6d79abe3e525ddf7c4ab5792cc751 (diff)
downloadlinux-a3ef2229c94ff70998724cb64b9cb4c77db9e950.tar.bz2
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')
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel.c6
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: