linux-kernel - Re: [PATCH] sched: partly revert "sched debug: remove NULL checking in print_cfs_rt

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Date:	Sun, 11 Jan 2009 02:40:50 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: partly revert "sched debug: remove NULL
	checking in print_cfs_rt_rq()"


* Li Zefan <lizf@...fujitsu.com> wrote:

> Impact: avoid accessing NULL tg.css->cgroup
> 
> In commit 0a0db8f5c9d4bbb9bbfcc2b6cb6bce2d0ef4d73d, I removed checking
> NULL tg.css->cgroup, but I realized I was wrong when I found reading
> /proc/sched_debug can race with cgroup_create().
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> ---
>  kernel/sched_debug.c |   21 +++++++++++++++++----
>  1 files changed, 17 insertions(+), 4 deletions(-)

applied to tip/sched/urgent, thanks!

	Ingo
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