epoll: cleanup: use RCU_INIT_POINTER when nulling

Eric Wong · torvalds · commit d6d67e7231c9 · 2013-04-30T17:04:04.000-07:00
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 &lt;normalperson@yhbt.net&gt;
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
@@ -1213,7 +1213,7 @@ 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

Original file line number	Diff line number	Diff line change
`@@ -1213,7 +1213,7 @@ static noinline void ep_destroy_wakeup_source(struct epitem *epi)`
`1213`	`1213`	`{`
`1214`	`1214`	`struct wakeup_source *ws = ep_wakeup_source(epi);`
`1215`	`1215`
`1216`		`- rcu_assign_pointer(epi->ws, NULL);`
	`1216`	`+ RCU_INIT_POINTER(epi->ws, NULL);`
`1217`	`1217`
`1218`	`1218`	`/*`
`1219`	`1219`	`* wait for ep_pm_stay_awake_rcu to finish, synchronize_rcu is`