From 03e22198d2379ffa746c9ea332fbb1f094f9423b Mon Sep 17 00:00:00 2001 From: Cyrill Gorcunov Date: Wed, 29 Sep 2010 23:01:38 -0400 Subject: [PATCH] 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 Signed-off-by: Cyrill Gorcunov Signed-off-by: Don Zickus Cc: fweisbec@gmail.com Cc: peterz@infradead.org Cc: Robert Richter Cc: Lin Ming LKML-Reference: <1285815698-4298-1-git-send-email-dzickus@redhat.com> Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/perf_event_p4.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) 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; -- 2.34.1