linux-kernel - Re: [RFC] cgroup basic comounting

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Date:	Fri, 16 Dec 2011 08:35:34 -0800
From:	Paul Menage <paul@...lmenage.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, lizf@...fujitsu.com,
	daniel.lezcano@...e.fr, a.p.zijlstra@...llo.nl,
	jbottomley@...allels.com, pjt@...gle.com, cgroups@...r.kernel.org,
	bsingharora@...il.com, devel@...nvz.org,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [RFC] cgroup basic comounting

On Fri, Dec 16, 2011 at 4:29 AM, Glauber Costa <glommer@...allels.com> wrote
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 1fd7867..e894a4f 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -1211,9 +1211,9 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
>                        set_bit(i, &opts->subsys_bits);
>                        one_ss = true;
>
> -                       break;
> +                       continue;
>                }
> -               if (i == CGROUP_SUBSYS_COUNT)
> +               if (opts->subsys_bits == 0)
>                        return -ENOENT;

This is broken - it will silently ignore unknown/misspelled subsystems
that are specified after a valid subsystem. Replacing the break with a
continue is harmless but doesn't make sense - if the token already
matched a subsystem name then it won't match any other subsystem.

What change are you actually trying to effect with this patch?

Paul
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