linux-kernel - [PATCH 3/3] epoll: remove unnecessary test of ep->ovflist for available events

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Message-Id: <1295110837-3061-3-git-send-email-shawn.bohrer@gmail.com>
Date:	Sat, 15 Jan 2011 11:00:37 -0600
From:	Shawn Bohrer <shawn.bohrer@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jack Stone <jwjstone@...tmail.fm>,
	Viresh Kumar <viresh.kumar@...com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk, Davide Libenzi <davidel@...ilserver.org>,
	Shawn Bohrer <shawn.bohrer@...il.com>
Subject: [PATCH 3/3] epoll: remove unnecessary test of ep->ovflist for available events

The additional test for ep->ovflist != EP_UNACTIVE_PTR to signify
available events was added in 5071f97ec6d74f006072de0ce89b67c8792fe5a1
but doesn't appear to do anything.  Either this is a bug or the check
isn't needed.

If the ep->ovflist is not EP_UNACTIVE_PTR then ep_send_events() calls
ep_scan_ready_list() which sets ep->ovflist = NULL thus loosing any
events which may have been stored there.

Signed-off-by: Shawn Bohrer <shawn.bohrer@...il.com>
---
 fs/eventpoll.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 57a77f5..afeb78c 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1180,7 +1180,7 @@ retry:
 	}
 skip:
 	/* Is it worth to try to dig for events ? */
-	eavail = !list_empty(&ep->rdllist) || ep->ovflist != EP_UNACTIVE_PTR;
+	eavail = !list_empty(&ep->rdllist);
 
 	spin_unlock_irqrestore(&ep->lock, flags);
 
-- 
1.7.3.4

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