linux-kernel - [PATCH -mm] epoll: cleanup: use RCU_INIT

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Message-ID: <20130328194616.GA19478@dcvr.yhbt.net>
Date:	Thu, 28 Mar 2013 19:46:16 +0000
From:	Eric Wong <normalperson@...t.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH -mm] epoll: cleanup: use RCU_INIT_POINTER when nulling

It is always safe to use RCU_INIT_POINTER to NULL a pointer.
This results in slightly smaller/faster code.

Signed-off-by: Eric Wong <normalperson@...t.net>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 Andrew: Sorry for the noise and requiring these cleanups.  Would you
 want a squashed commit with all my RCU+ws-related epoll changes to keep
 history cleaner?  I will try to be more careful and require less
 followup patches in the future :x

 fs/eventpoll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index dcf7906..1295d3a 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1207,7 +1207,7 @@ static noinline void ep_destroy_wakeup_source(struct epitem *epi)
 {
 	struct wakeup_source *ws = ep_wakeup_source(epi);
 
-	rcu_assign_pointer(epi->ws, NULL);
+	RCU_INIT_POINTER(epi->ws, NULL);
 
 	/*
 	 * wait for ep_pm_stay_awake_rcu to finish, synchronize_rcu is
-- 
Eric Wong
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