perf/core: Add sanity check to deal with pinned event failure
authorReinette Chatre <reinette.chatre@intel.com>
Wed, 19 Sep 2018 17:29:06 +0000 (10:29 -0700)
committerThomas Gleixner <tglx@linutronix.de>
Fri, 28 Sep 2018 20:44:53 +0000 (22:44 +0200)
commitbefb1b3c2703897c5b8ffb0044dc5d0e5f27c5d7
treecad7af2717da74d35f2a6bdf23a590cc5522b3a7
parentc307aaf3eb47969105887e4e8991ec00960a7ce8
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
kernel/events/core.c