From mboxrd@z Thu Jan  1 00:00:00 1970
From: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH 6/8] cgroup: remove cgroup->name
Date: Wed, 12 Feb 2014 15:52:20 +0800
Message-ID: <52FB2834.3090408@huawei.com>
References: <1391877509-10855-1-git-send-email-tj@kernel.org>
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To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

> diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
> index dd52e7f..30eee3b 100644
> --- a/kernel/sched/debug.c
> +++ b/kernel/sched/debug.c
> @@ -111,8 +111,7 @@ static char *task_group_path(struct task_group *tg)
>  	if (autogroup_path(tg, group_path, PATH_MAX))
>  		return group_path;
>  
> -	cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
> -	return group_path;
> +	return cgroup_path(tg->css.cgroup, group_path, PATH_MAX);

The caller won't check the return value but pass it to printk/seq_printf,
but now cgroup_path() might return -ENAMETOOLONG..

From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 12 Feb 2014 15:52:20 +0800
From: Li Zefan <lizefan@huawei.com>
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To: Tejun Heo <tj@kernel.org>
CC: <containers@lists.linux-foundation.org>, <cgroups@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@redhat.com>,
        "Johannes Weiner" <hannes@cmpxchg.org>,
        Balbir Singh <bsingharora@gmail.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 6/8] cgroup: remove cgroup->name
References: <1391877509-10855-1-git-send-email-tj@kernel.org> <1391877509-10855-7-git-send-email-tj@kernel.org>
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> diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
> index dd52e7f..30eee3b 100644
> --- a/kernel/sched/debug.c
> +++ b/kernel/sched/debug.c
> @@ -111,8 +111,7 @@ static char *task_group_path(struct task_group *tg)
>  	if (autogroup_path(tg, group_path, PATH_MAX))
>  		return group_path;
>  
> -	cgroup_path(tg->css.cgroup, group_path, PATH_MAX);
> -	return group_path;
> +	return cgroup_path(tg->css.cgroup, group_path, PATH_MAX);

The caller won't check the return value but pass it to printk/seq_printf,
but now cgroup_path() might return -ENAMETOOLONG..