linux-kernel - Re: [PATCH resend] fs/eventpoll.c: fix compilation warning

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Date:	Fri, 14 Jan 2011 13:07:16 +0000
From:	Jack Stone <jwjstone@...tmail.fm>
To:	Viresh Kumar <viresh.kumar@...com>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk, shawn.bohrer@...il.com
Subject: Re: [PATCH resend] fs/eventpoll.c: fix compilation warning

[cc Al Viro and Shawn Bohrer]
On 14/01/2011 11:52, Viresh Kumar wrote:
> This patch fixes following compilation warning
> fs/eventpoll.c:1119: warning: 'slack' may be used uninitialized in this function
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...com>
> ---
>  fs/eventpoll.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/eventpoll.c b/fs/eventpoll.c
> index 8cf0724..89b5e98 100644
> --- a/fs/eventpoll.c
> +++ b/fs/eventpoll.c
> @@ -1116,7 +1116,7 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
>  {
>  	int res, eavail, timed_out = 0;
>  	unsigned long flags;
> -	long slack;
> +	long uninitialized_var(slack);
>  	wait_queue_t wait;
>  	struct timespec end_time;
>  	ktime_t expires, *to = NULL;

Hi Viresh,

This is certainly the correct thing to do if timeout cannot be negative.

Al, Shawn

Can timeout be negative, and if so what does it mean?

Thanks,

Jack
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