From: Andi Kleen <andi@firstfloor.org>
To: peterz@infradead.org
Cc: mingo@kernel.org, eranian@google.com,
linux-kernel@vger.kernel.org,
Markus Metzger <markus.t.metzger@intel.com>,
Andi Kleen <ak@linux.intel.com>
Subject: [PATCH] perf, nmi: fix unknown NMI warning
Date: Fri, 14 Feb 2014 16:44:08 -0800
Message-ID: <1392425048-5309-1-git-send-email-andi@firstfloor.org> (raw)
From: Markus Metzger <markus.t.metzger@intel.com>
[From Markus, just sending for him because he had problems with his mail]
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.
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
arch/x86/kernel/cpu/perf_event_intel.c | 6 ++----
1 file 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 0fa4f24..698ae77 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:
--
1.8.5.3
next reply index
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-15 0:44 Andi Kleen [this message]
2014-02-15 9:58 ` Peter Zijlstra
2014-02-16 18:38 ` Andi Kleen
2014-02-16 19:23 ` Peter Zijlstra
2014-02-16 19:43 ` Andi Kleen
2014-02-21 21:14 ` [tip:perf/urgent] perf, nmi: Fix " tip-bot for Markus Metzger
-- strict thread matches above, loose matches on Subject: below --
2014-02-11 23:51 [PATCH] perf, nmi: fix " Andi Kleen
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