diff options
| author | Lin Ming <ming.m.lin@intel.com> | 2010-08-25 21:06:32 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-09-20 13:36:09 -0700 |
| commit | 133aa6cbaf169f375a70d0ed8df7bc2ab583cc34 (patch) | |
| tree | b255b52ad1af69825d983711062caf7a3222b9d0 /arch | |
| parent | de9711df2a891af562936c1eafb3c2e25121c213 (diff) | |
perf, x86, Pentium4: Clear the P4_CCCR_FORCE_OVF flag
commit 8d330919927ea31fa083b5a80084dc991da813a0 upstream.
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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -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 0ffe19e9373a..a187365d98b4 100644 --- a/arch/x86/kernel/cpu/perf_event_p4.c +++ b/arch/x86/kernel/cpu/perf_event_p4.c @@ -457,6 +457,8 @@ 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)); + + event->hw.config &= ~P4_CCCR_FORCE_OVF; } rc = x86_setup_perfctr(event); |