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perf, trace: Remove superfluous rcu_read_lock()

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__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>
This commit is contained in:
Peter Zijlstra 2010-05-21 15:13:59 +02:00 committed by Ingo Molnar
parent ecc55f84b2
commit 8ed92280be
1 changed files with 0 additions and 2 deletions
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kernel/perf_event.c
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@ -4613,12 +4613,10 @@ void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
perf_sample_data_init(&data, addr); perf_sample_data_init(&data, addr);
data.raw = &raw; data.raw = &raw;
rcu_read_lock();
hlist_for_each_entry_rcu(event, node, head, hlist_entry) { hlist_for_each_entry_rcu(event, node, head, hlist_entry) {
if (perf_tp_event_match(event, &data, regs)) if (perf_tp_event_match(event, &data, regs))
perf_swevent_add(event, count, 1, &data, regs); perf_swevent_add(event, count, 1, &data, regs);
} }
rcu_read_unlock();
perf_swevent_put_recursion_context(rctx); perf_swevent_put_recursion_context(rctx);
} }