From c44d70a340554a33071339064a303ac0f1a31623 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Sun, 17 May 2009 11:24:08 +0200
Subject: perf_counter: fix counter inheritance race

Context rotation should not occur when we are in the middle of
walking the counter list when inheriting counters ...

[ Impact: fix occasionally incorrect perf stat results ]

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 include/linux/perf_counter.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'include/linux/perf_counter.h')

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index c8c1dfc22c9..13cb2fbbf33 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -508,6 +508,7 @@ struct perf_counter_context {
 	int			nr_counters;
 	int			nr_active;
 	int			is_active;
+	int			rr_allowed;
 	struct task_struct	*task;
 
 	/*
-- 
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