linux-kernel - Re: [PATCH 3/4] cpuset: Fix unchecked calls to NODEMASK

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Message-Id: <20110217144643.0d60bef4.akpm@linux-foundation.org>
Date:	Thu, 17 Feb 2011 14:46:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Paul Menage <menage@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	缪 勰 <miaox@...fujitsu.com>,
	linux-mm@...ck.org
Subject: Re: [PATCH 3/4] cpuset: Fix unchecked calls to NODEMASK_ALLOC()

On Thu, 17 Feb 2011 09:50:09 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> +/*
> + * In functions that can't propogate errno to users, to avoid declaring a
> + * nodemask_t variable, and avoid using NODEMASK_ALLOC that can return
> + * -ENOMEM, we use this global cpuset_mems.
> + *
> + * It should be used with cgroup_lock held.

I'll do s/should/must/ - that would be a nasty bug.

I'd be more comfortable about the maintainability of this optimisation
if we had

	WARN_ON(!cgroup_is_locked());

at each site.

> + */
> +static nodemask_t cpuset_mems;
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