perf_counter: Fix an ipi-deadlock
commit970892a9031a5dc7217bd394fb9d89fa75a4a7bc
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Thu, 13 Aug 2009 09:47:54 +0000 (13 11:47 +0200)
committerIngo Molnar <mingo@elte.hu>
Thu, 13 Aug 2009 10:58:05 +0000 (13 12:58 +0200)
treed6d5eee6d24cde67c279d5cc753512fc85cd9e5b
parent3dab77fb1bf89664bb1c9544607159dcab6f7d57
perf_counter: Fix an ipi-deadlock

perf_pending_counter() is called from IRQ context and will call
perf_counter_disable(), however perf_counter_disable() uses
smp_call_function_single() which doesn't fancy being used with
IRQs disabled due to IPI deadlocks.

Fix this by making it use the local __perf_counter_disable()
call and teaching the counter_sched_out() code about pending
disables as well.

This should cover the case where a counter migrates before the
pending queue gets processed.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Corey J Ashford <cjashfor@us.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: stephane eranian <eranian@googlemail.com>
LKML-Reference: <20090813103655.244097721@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/perf_counter.c