From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 21 May 2010 13:13:59 +0000 (+0200)
Subject: perf, trace: Remove superfluous rcu_read_lock()
X-Git-Tag: v2.6.36-rc1~41^2~93
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8ed92280be013180e24c84456ab6babcb07037cc;p=profile%2Fivi%2Fkernel-x86-ivi.git

perf, trace: Remove superfluous rcu_read_lock()

__DO_TRACE() already calls the callbacks under rcu_read_lock_sched(),
which is sufficient for our needs, avoid doing it again.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 4bd3b59..b39bec3 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4613,12 +4613,10 @@ void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
 	perf_sample_data_init(&data, addr);
 	data.raw = &raw;
 
-	rcu_read_lock();
 	hlist_for_each_entry_rcu(event, node, head, hlist_entry) {
 		if (perf_tp_event_match(event, &data, regs))
 			perf_swevent_add(event, count, 1, &data, regs);
 	}
-	rcu_read_unlock();
 
 	perf_swevent_put_recursion_context(rctx);
 }