From 3fb0e584a68cd1c5085e69be441f2ad032aaee72 Mon Sep 17 00:00:00 2001 From: Davide Libenzi Date: Tue, 22 Mar 2011 16:34:46 -0700 Subject: [PATCH] epoll: move ready event check into proper inline Move the event readiness check into a proper inline, and use it uniformly inside ep_poll() code. Events in the ->ovflist are no less ready than the ones in ->rdllist. Signed-off-by: Davide Libenzi Cc: Shawn Bohrer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/eventpoll.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index ff12f7ac73ef..57298d092f56 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -315,6 +315,19 @@ static void ep_nested_calls_init(struct nested_calls *ncalls) spin_lock_init(&ncalls->lock); } +/** + * ep_events_available - Checks if ready events might be available. + * + * @ep: Pointer to the eventpoll context. + * + * Returns: Returns a value different than zero if ready events are available, + * or zero otherwise. + */ +static inline int ep_events_available(struct eventpoll *ep) +{ + return !list_empty(&ep->rdllist) || ep->ovflist != EP_UNACTIVE_PTR; +} + /** * ep_call_nested - Perform a bound (possibly) nested call, by checking * that the recursion limit is not exceeded, and that @@ -1158,7 +1171,7 @@ retry: spin_lock_irqsave(&ep->lock, flags); res = 0; - if (list_empty(&ep->rdllist)) { + if (!ep_events_available(ep)) { /* * We don't have any available event to return to the caller. * We need to sleep here, and we will be wake up by @@ -1174,7 +1187,7 @@ retry: * to TASK_INTERRUPTIBLE before doing the checks. */ set_current_state(TASK_INTERRUPTIBLE); - if (!list_empty(&ep->rdllist) || timed_out) + if (ep_events_available(ep) || timed_out) break; if (signal_pending(current)) { res = -EINTR; @@ -1192,7 +1205,7 @@ retry: set_current_state(TASK_RUNNING); } /* Is it worth to try to dig for events ? */ - eavail = !list_empty(&ep->rdllist) || ep->ovflist != EP_UNACTIVE_PTR; + eavail = ep_events_available(ep); spin_unlock_irqrestore(&ep->lock, flags);