perf/core: Add sanity check to deal with pinned event failure
It is possible that a failure can occur during the scheduling of a pinned event. The initial portion of perf_event_read_local() contains the various error checks an event should pass before it can be considered valid. Ensure that the potential scheduling failure of a pinned event is checked for and have a credible error. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: fenghua.yu@intel.com Cc: tony.luck@intel.com Cc: acme@kernel.org Cc: gavin.hindman@intel.com Cc: jithu.joseph@intel.com Cc: dave.hansen@intel.com Cc: hpa@zytor.com Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/6486385d1f30336e9973b24c8c65f5079543d3d3.1537377064.git.reinette.chatre@intel.com
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@ -3935,6 +3935,12 @@ int perf_event_read_local(struct perf_event *event, u64 *value,
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goto out;
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}
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/* If this is a pinned event it must be running on this CPU */
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if (event->attr.pinned && event->oncpu != smp_processor_id()) {
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ret = -EBUSY;
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goto out;
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}
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/*
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* If the event is currently on this CPU, its either a per-task event,
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* or local to this CPU. Furthermore it means its ACTIVE (otherwise
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