From 96f6d4444302bb2ea2cf409529eef816462f6ce0 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Mon, 23 Mar 2009 18:22:07 +0100
Subject: perf_counter: avoid recursion

Tracepoint events like lock_acquire and software counters like
pagefaults can recurse into the perf counter code again, avoid that.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090323172417.152096433@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 include/linux/perf_counter.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'include')

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 56099e52970d..18dc17d0a61c 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -328,6 +328,13 @@ struct perf_cpu_context {
 	int				active_oncpu;
 	int				max_pertask;
 	int				exclusive;
+
+	/*
+	 * Recursion avoidance:
+	 *
+	 * task, softirq, irq, nmi context
+	 */
+	int			recursion[4];
 };
 
 /*
-- 
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