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05 April 2024, 19:05:47 UTC
Revision 27ca9236c96f4a21b72a2b4f08260efeab951bd0 authored by Thomas Gleixner on 09 February 2016, 20:11:26 UTC, committed by Ingo Molnar on 17 February 2016, 09:37:29 UTC 
perf/core: Remove the bogus and dangerous CPU_DOWN_FAILED hotplug state
 
If CPU_DOWN_PREPARE fails the perf hotplug notifier is called for
CPU_DOWN_FAILED and calls perf_event_init_cpu(), which checks whether the
swhash is referenced. If yes it allocates a new hash and stores the pointer in
the per cpu data structure.

But at this point the cpu is still online, so there must be a valid hash
already. By overwriting the pointer the existing hash is not longer
accessible.

Remove the CPU_DOWN_FAILED state, as there is nothing to (re)allocate.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/20160209201007.763417379@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent b4f75d4
History
Tip revision: 27ca9236c96f4a21b72a2b4f08260efeab951bd0 authored by Thomas Gleixner on 09 February 2016, 20:11:26 UTC
perf/core: Remove the bogus and dangerous CPU_DOWN_FAILED hotplug state
Tip revision: 27ca923
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