linux-kernel - Re: [PATCH -mm] cgroups: fix failure path in cgroup_write_event

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Message-ID: <cc557aab1002240528t28eae36dj976525be2fcf7246@mail.gmail.com>
Date:	Wed, 24 Feb 2010 15:28:31 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"containers@...ts.osdl.org" <containers@...ts.osdl.org>
Subject: Re: [PATCH -mm] cgroups: fix failure path in cgroup_write_event_control()

On Wed, Feb 24, 2010 at 5:22 AM, Li Zefan <lizf@...fujitsu.com> wrote:
> How to reproduce:
>
>  # mount -t cgroup -o memory xxx /cgroup
>  # mkdir /cgroup/tmp
>  # ./cgroup_event_listener /cgroup/tmp/cgroup.event_control abc
>  ^C
>  # rmdir /cgroup/tmp
>  # cat /proc/cgroups | grep memory
>  memory  2       2       1         (should be "2 1 1")
>  # umount /cgroup
>  (failed!)
>
> Using a single goto label to cleanup multi failure paths can
> get things wrong quite easily, while multi labels makes the
> code cleaner.

I disagree.
It's easer to make mistake on changing code with multi failure
paths, if you want to move a code within function.
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