Commit 8ed92280 authored May 21, 2010 by Peter Zijlstra Committed by Ingo Molnar Jun 09, 2010

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>

parent ecc55f84

kernel/perf_event.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -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);
		}