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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-03-08 13:51:01 +0100
committerIngo Molnar <mingo@elte.hu>2010-03-10 13:22:26 +0100
commit3fb2b8ddcc6a7aa62af6bd2cb939edfd4c460506 (patch)
treee86a4fc239653fe55d448d28f1841fb9875fe102 /arch/x86
parent32975a4f114be52286f9a5bf6c230dbb8c0e1903 (diff)
perf, x86, Do not user perf_disable from NMI context
Explicitly use intel_pmu_{disable,enable}_all() in intel_pmu_handle_irq() to avoid the NMI race conditions in perf_{disable,enable} Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: paulus@samba.org Cc: eranian@google.com Cc: robert.richter@amd.com Cc: fweisbec@gmail.com LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 12e811a7d74..c582449163f 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -745,11 +745,11 @@ static int intel_pmu_handle_irq(struct pt_regs *regs)
cpuc = &__get_cpu_var(cpu_hw_events);
- perf_disable();
+ intel_pmu_disable_all();
intel_pmu_drain_bts_buffer();
status = intel_pmu_get_status();
if (!status) {
- perf_enable();
+ intel_pmu_enable_all();
return 0;
}
@@ -759,8 +759,7 @@ again:
WARN_ONCE(1, "perfevents: irq loop stuck!\n");
perf_event_print_debug();
intel_pmu_reset();
- perf_enable();
- return 1;
+ goto done;
}
inc_irq_stat(apic_perf_irqs);
@@ -790,8 +789,8 @@ again:
if (status)
goto again;
- perf_enable();
-
+done:
+ intel_pmu_enable_all();
return 1;
}