Commit-ID: 394570b7939e1262f39373866166d8ee0a506e88 Gitweb: http://git.kernel.org/tip/394570b7939e1262f39373866166d8ee0a506e88 Author: Peter Zijlstra <pet...@infradead.org> AuthorDate: Thu, 31 Oct 2013 17:41:23 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Wed, 6 Nov 2013 12:34:23 +0100
perf: Update a stale comment Signed-off-by: Peter Zijlstra <pet...@infradead.org> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: Mathieu Desnoyers <mathieu.desnoy...@polymtl.ca> Cc: Michael Ellerman <mich...@ellerman.id.au> Cc: Michael Neuling <mi...@neuling.org> Cc: "Paul E. McKenney" <paul...@linux.vnet.ibm.com> Cc: james.ho...@imgtec.com Cc: Vince Weaver <vi...@deater.net> Cc: Victor Kaplansky <vict...@il.ibm.com> Cc: Oleg Nesterov <o...@redhat.com> Cc: Anton Blanchard <an...@samba.org> Link: http://lkml.kernel.org/n/tip-9s5mze78gmlz19agt39i8...@git.kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
