[tip:perf/core] perf, trace: Remove superfluous rcu_read_lock()

From: tip-bot for Peter Zijlstra
Date: Wed Jun 09 2010 - 06:15:50 EST

Commit-ID: 8ed92280be013180e24c84456ab6babcb07037cc
Gitweb: http://git.kernel.org/tip/8ed92280be013180e24c84456ab6babcb07037cc
Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Fri, 21 May 2010 15:13:59 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 9 Jun 2010 11:12:33 +0200

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@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
kernel/perf_event.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)

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();

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