Commit-ID: 394570b7939e1262f39373866166d8ee0a506e88 Gitweb: http://git.kernel.org/tip/394570b7939e1262f39373866166d8ee0a506e88 Author: Peter Zijlstra <[email protected]> AuthorDate: Thu, 31 Oct 2013 17:41:23 +0100 Committer: Ingo Molnar <[email protected]> CommitDate: Wed, 6 Nov 2013 12:34:23 +0100
perf: Update a stale comment Signed-off-by: Peter Zijlstra <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Mathieu Desnoyers <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Michael Neuling <[email protected]> Cc: "Paul E. McKenney" <[email protected]> Cc: [email protected] Cc: Vince Weaver <[email protected]> Cc: Victor Kaplansky <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Anton Blanchard <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- kernel/events/ring_buffer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index c52a32f..e8b168a 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -85,8 +85,8 @@ again: rb->user_page->data_head = head; /* - * Now check if we missed an update, rely on the (compiler) - * barrier in atomic_dec_and_test() to re-read rb->head. + * Now check if we missed an update -- rely on previous implied + * compiler barriers to force a re-read. */ if (unlikely(head != local_read(&rb->head))) { local_inc(&rb->nest); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
