Commit 394570b7 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar

perf: Update a stale comment

Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Michael Ellerman <michael@ellerman.id.au>
Cc: Michael Neuling <mikey@neuling.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: james.hogan@imgtec.com
Cc: Vince Weaver <vince@deater.net>
Cc: Victor Kaplansky <VICTORK@il.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Anton Blanchard <anton@samba.org>
Link: http://lkml.kernel.org/n/tip-9s5mze78gmlz19agt39i8rii@git.kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 524feca5
...@@ -85,8 +85,8 @@ static void perf_output_put_handle(struct perf_output_handle *handle) ...@@ -85,8 +85,8 @@ static void perf_output_put_handle(struct perf_output_handle *handle)
rb->user_page->data_head = head; rb->user_page->data_head = head;
/* /*
* Now check if we missed an update, rely on the (compiler) * Now check if we missed an update -- rely on previous implied
* barrier in atomic_dec_and_test() to re-read rb->head. * compiler barriers to force a re-read.
*/ */
if (unlikely(head != local_read(&rb->head))) { if (unlikely(head != local_read(&rb->head))) {
local_inc(&rb->nest); local_inc(&rb->nest);
......
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