From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Thu, 13 Aug 2009 09:47:54 +0000 (+0200)
Subject: perf_counter: Fix an ipi-deadlock
X-Git-Tag: v2.6.31-rc6~2^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=970892a9031a5dc7217bd394fb9d89fa75a4a7bc;p=pandora-kernel.git

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>
---

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