| Date | Sat, 18 Sep 2010 12:11:53 -0700 | From | Greg KH <> | Subject | [015/129] perf, x86, Pentium4: Clear the P4_CCCR_FORCE_OVF flag |
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2.6.35-stable review patch. If anyone has any objections, please let us know.
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From: Lin Ming <ming.m.lin@intel.com>
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>
--- arch/x86/kernel/cpu/perf_event_p4.c | 2 ++ 1 file changed, 2 insertions(+)
--- 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_even 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);
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