linux-kernel - Re: [PATCH] cpuset: avoid changing cpuset's cpus when -errno returned

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Message-ID: <6599ad830809041049i646c9e43gb276090dc76ab1a7@mail.gmail.com>
Date:	Thu, 4 Sep 2008 10:49:09 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Li Zefan" <lizf@...fujitsu.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Paul Jackson" <pj@....com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpuset: avoid changing cpuset's cpus when -errno returned

On Wed, Sep 3, 2008 at 12:33 AM, Li Zefan <lizf@...fujitsu.com> wrote:
> After the patch:
>
> commit 0b2f630a28d53b5a2082a5275bc3334b10373508
> Author: Miao Xie <miaox@...fujitsu.com>
> Date:   Fri Jul 25 01:47:21 2008 -0700
>
>    cpusets: restructure the function update_cpumask() and update_nodemask()
>
> It might happen that 'echo 0 > /cpuset/sub/cpus' returns failure but 'cpus'
> has been changed, because cpus was changed before calling heap_init() which
> may return -ENOMEM.

Since neither of the callers of update_tasks_cpumask() check the
return value (one knows it's going to be 0, the other doesn't care
about errors) I think it would be better to just make it a void
function.

Paul
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