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| author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-13 01:32:17 -0300 |
|---|---|---|
| committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-13 14:23:33 -0300 |
| commit | 0a2bb03fe20f81dc4cac96d7fe0e4194ae6efffd (patch) | |
| tree | f643c68f37c9aa9e2e0b1623b363777c125350df /arch/x86/kernel/cpu/perf_event_intel_cqm.c | |
| parent | c49e505b3486503302e30c4237821bece90b4c2d (diff) | |
Linux-libre 4.1.5-gnupck-4.1.5-gnu
Diffstat (limited to 'arch/x86/kernel/cpu/perf_event_intel_cqm.c')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel_cqm.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_cqm.c b/arch/x86/kernel/cpu/perf_event_intel_cqm.c index e4d1b8b73..cb77b11bc 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_cqm.c +++ b/arch/x86/kernel/cpu/perf_event_intel_cqm.c @@ -934,6 +934,14 @@ static u64 intel_cqm_event_count(struct perf_event *event) return 0; /* + * Getting up-to-date values requires an SMP IPI which is not + * possible if we're being called in interrupt context. Return + * the cached values instead. + */ + if (unlikely(in_interrupt())) + goto out; + + /* * Notice that we don't perform the reading of an RMID * atomically, because we can't hold a spin lock across the * IPIs. |