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| author | Cyrill Gorcunov <gorcunov@gmail.com> | 2010-09-29 23:01:38 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-09-30 09:17:59 +0200 |
| commit | 03e22198d2379ffa746c9ea332fbb1f094f9423b (patch) | |
| tree | 51ab8e4665943d9a703c110fba68a90d4410eb43 /arch | |
| parent | 98d943b02f6f1b57787ff1aa6f34d019a407e3ee (diff) | |
| download | linux-03e22198d2379ffa746c9ea332fbb1f094f9423b.tar.bz2 | |
perf, x86: Handle in flight NMIs on P4 platform
Stephane reported we've forgot to guard the P4 platform
against spurious in-flight performance IRQs. Fix it.
This fixes potential spurious 'dazed and confused' NMI
messages.
Reported-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: fweisbec@gmail.com
Cc: peterz@infradead.org
Cc: Robert Richter <robert.richter@amd.com>
Cc: Lin Ming <ming.m.lin@intel.com>
LKML-Reference: <1285815698-4298-1-git-send-email-dzickus@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_p4.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_p4.c b/arch/x86/kernel/cpu/perf_event_p4.c index b560db3305be..249015173992 100644 --- a/arch/x86/kernel/cpu/perf_event_p4.c +++ b/arch/x86/kernel/cpu/perf_event_p4.c @@ -660,8 +660,12 @@ static int p4_pmu_handle_irq(struct pt_regs *regs) for (idx = 0; idx < x86_pmu.num_counters; idx++) { int overflow; - if (!test_bit(idx, cpuc->active_mask)) + if (!test_bit(idx, cpuc->active_mask)) { + /* catch in-flight IRQs */ + if (__test_and_clear_bit(idx, cpuc->running)) + handled++; continue; + } event = cpuc->events[idx]; hwc = &event->hw; |