Commit-ID: 8d330919927ea31fa083b5a80084dc991da813a0 Gitweb: http://git.kernel.org/tip/8d330919927ea31fa083b5a80084dc991da813a0 Author: Lin Ming <ming.m.lin@xxxxxxxxx> AuthorDate: Wed, 25 Aug 2010 21:06:32 +0000 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Wed, 25 Aug 2010 15:15:33 +0200 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@xxxxxxxxxxxx> Signed-off-by: Lin Ming <ming.m.lin@xxxxxxxxx> Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- 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 febb12c..7e578e9 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); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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