linux-kernel - Re: [PATCH] cgroups: fix lockdep subclasses overflow

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Message-ID: <6599ad830902040748u58c7afcasc4152175aa382a2b@mail.gmail.com>
Date:	Wed, 4 Feb 2009 07:48:42 -0800
From:	Paul Menage <menage@...gle.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH] cgroups: fix lockdep subclasses overflow

On Wed, Feb 4, 2009 at 1:11 AM, Li Zefan <lizf@...fujitsu.com> wrote:
>
> This patch uses different lockdep keys for different subsystems.
>
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>

Acked-by: Paul Menage <menage@...gle.com>

Looks good, thanks.

Paul

> ---
>  include/linux/cgroup.h |    1 +
>  kernel/cgroup.c        |    3 ++-
>  2 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
> index e4e8e11..499900d 100644
> --- a/include/linux/cgroup.h
> +++ b/include/linux/cgroup.h
> @@ -378,6 +378,7 @@ struct cgroup_subsys {
>         * - initiating hotplug events
>         */
>        struct mutex hierarchy_mutex;
> +       struct lock_class_key subsys_key;
>
>        /*
>         * Link to parent, and list entry in parent's children.
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 5a54ff4..e14db9c 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -2351,7 +2351,7 @@ static void cgroup_lock_hierarchy(struct cgroupfs_root *root)
>        for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
>                struct cgroup_subsys *ss = subsys[i];
>                if (ss->root == root)
> -                       mutex_lock_nested(&ss->hierarchy_mutex, i);
> +                       mutex_lock(&ss->hierarchy_mutex);
>        }
>  }
>
> @@ -2637,6 +2637,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
>        BUG_ON(!list_empty(&init_task.tasks));
>
>        mutex_init(&ss->hierarchy_mutex);
> +       lockdep_set_class(&ss->hierarchy_mutex, &ss->subsys_key);
>        ss->active = 1;
>  }
>
> --
> 1.5.4.rc3
>
>
>
>
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