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| author | Lin Ming <ming.m.lin@intel.com> | 2010-08-25 23:06:32 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-08-25 15:15:33 +0200 |
| commit | 8d330919927ea31fa083b5a80084dc991da813a0 (patch) | |
| tree | 5c4ccce4ee5e660abfa497e842a7d356d18a674e | |
| parent | tracing/trace_stack: Fix stack trace on ppc64 (diff) | |
| download | linux-8d330919927ea31fa083b5a80084dc991da813a0.tar.xz linux-8d330919927ea31fa083b5a80084dc991da813a0.zip | |
perf, x86, Pentium4: Clear the P4_CCCR_FORCE_OVF flag
If on Pentium4 CPUs the FORCE_OVF flag is set then an NMI happens
on every event, which can generate a flood of NMIs. Clear it.
Reported-by: Vince Weaver <vweaver1@eecs.utk.edu>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_p4.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_p4.c b/arch/x86/kernel/cpu/perf_event_p4.c index febb12cea795..7e578e9cc58b 100644 --- a/arch/x86/kernel/cpu/perf_event_p4.c +++ b/arch/x86/kernel/cpu/perf_event_p4.c @@ -497,6 +497,8 @@ static int p4_hw_config(struct perf_event *event) event->hw.config |= event->attr.config & (p4_config_pack_escr(P4_ESCR_MASK_HT) | p4_config_pack_cccr(P4_CCCR_MASK_HT | P4_CCCR_RESERVED)); + + event->hw.config &= ~P4_CCCR_FORCE_OVF; } rc = x86_setup_perfctr(event); |