From: Li Zefan <lizf@cn.fujitsu.com>
Date: Sat, 10 Jan 2009 07:43:15 +0000 (+0800)
Subject: sched: partly revert "sched debug: remove NULL checking in print_cfs_rt_rq()"
X-Git-Tag: v2.6.29-rc2~101^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=805194c35b91999b139e4d6b6145f4f84fd4c814;p=pandora-kernel.git

sched: partly revert "sched debug: remove NULL checking in print_cfs_rt_rq()"

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@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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