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From: Eric Wong <normalperson@yhbt.net>
To: Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
	viro@zeniv.linux.org.uk
Subject: Re: [PATCH 09/11] epoll: Remove unnecessary error path
Date: Mon, 30 Sep 2013 20:59:06 +0000	[thread overview]
Message-ID: <20130930205906.GA13646@dcvr.yhbt.net> (raw)
In-Reply-To: <1380572952-30729-10-git-send-email-andi@firstfloor.org>

Andi Kleen <andi@firstfloor.org> wrote:
> From: Andi Kleen <ak@linux.intel.com>
> 
> A static checker was pointing out that nothing can possible set
> nwait < 0 in this path. The comment and the check appears to be
> outdated. Remove it.

I don't think so...

> Cc: viro@zeniv.linux.org.uk
> Signed-off-by: Andi Kleen <ak@linux.intel.com>
> ---
>  fs/eventpoll.c | 10 ----------
>  1 file changed, 10 deletions(-)
> 
> diff --git a/fs/eventpoll.c b/fs/eventpoll.c
> index 473e09d..f72bf55 100644
> --- a/fs/eventpoll.c
> +++ b/fs/eventpoll.c
> @@ -1276,15 +1276,6 @@ static int ep_insert(struct eventpoll *ep, struct epoll_event *event,
>  	 */
>  	revents = ep_item_poll(epi, &epq.pt);

ep_item_poll calls f_op->poll, which calls poll_wait().
poll_wait() will call ep_ptable_queue_proc.

> -	/*
> -	 * We have to check if something went wrong during the poll wait queue
> -	 * install process. Namely an allocation for a wait queue failed due
> -	 * high memory pressure.
> -	 */
> -	error = -ENOMEM;
> -	if (epi->nwait < 0)
> -		goto error_unregister;
> -
>  	/* Add the current item to the list of active epoll hook for this file */
>  	spin_lock(&tfile->f_lock);
>  	list_add_tail(&epi->fllink, &tfile->f_ep_links);
> @@ -1334,7 +1325,6 @@ error_remove_epi:
>  
>  	rb_erase(&epi->rbn, &ep->rbr);
>  
> -error_unregister:
>  	ep_unregister_pollwait(ep, epi);
>  
>  	/*

  reply	other threads:[~2013-09-30 20:59 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-30 20:29 Various static checker fixes Andi Kleen
2013-09-30 20:29 ` [PATCH 01/11] random: don't feed stack data into pool when interrupt regs NULL Andi Kleen
2013-09-30 20:51   ` Luck, Tony
2013-10-01 12:44     ` Theodore Ts'o
2014-04-04 16:54       ` Sebastian Andrzej Siewior
2014-04-07  4:01         ` Theodore Ts'o
2014-04-07 19:30           ` Sebastian Andrzej Siewior
2014-04-07 23:26             ` Theodore Ts'o
2014-04-09 18:14             ` rkuo
2013-09-30 20:29 ` [PATCH 02/11] Disable initialized_var for clang Andi Kleen
2013-09-30 20:29 ` [PATCH 03/11] posix-timers: Initialize timer value to 0 for invalid timers Andi Kleen
2013-09-30 20:29 ` [PATCH 04/11] block: Return error code of elevator init function Andi Kleen
2013-10-01 12:25   ` Jeff Moyer
2013-09-30 20:29 ` [PATCH 05/11] seq_file: Handle ->next error in seq_read Andi Kleen
2013-09-30 20:29 ` [PATCH 06/11] sysctl: remove unnecessary variable initialization Andi Kleen
2013-09-30 20:29 ` [PATCH 07/11] igb: Avoid uninitialized advertised variable in eee_set_cur Andi Kleen
2013-10-01 15:00   ` Wyborny, Carolyn
2013-10-01 23:10   ` Jeff Kirsher
2013-10-02 20:33   ` David Miller
2013-09-30 20:29 ` [PATCH 08/11] ext4: Fix end of group handling in ext4_mb_init_cache Andi Kleen
2013-10-01 12:45   ` Theodore Ts'o
2013-10-01 14:20     ` Andi Kleen
2013-09-30 20:29 ` [PATCH 09/11] epoll: Remove unnecessary error path Andi Kleen
2013-09-30 20:59   ` Eric Wong [this message]
2013-09-30 21:01     ` Andi Kleen
2013-09-30 20:29 ` [PATCH 10/11] tcp: Always set options to 0 before calling tcp_established_options Andi Kleen
2013-10-02 20:33   ` David Miller
2013-09-30 20:29 ` [PATCH 11/11] perf: Avoid uninitialized sample type reference in __perf_event__output_id_sample Andi Kleen
2013-10-02  8:57   ` Peter Zijlstra
2013-10-02 17:25     ` Andi Kleen
2013-10-02 17:36       ` Peter Zijlstra
2013-10-03  6:42         ` Ingo Molnar
2013-10-03 18:16           ` Andi Kleen
2013-10-04  6:24             ` Ingo Molnar

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