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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-02-27 14:53:08 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-02-28 09:17:42 +0100 |
| commit | 1883c79a57a5fe25309007590cccb1b2782c41b2 (patch) | |
| tree | abf862c8282acdb551c8f7220d862433e5763bc5 /include | |
| parent | 622ea685f1fafdf84d612440535c84341f0860b8 (diff) | |
| download | op-kernel-dev-1883c79a57a5fe25309007590cccb1b2782c41b2.zip op-kernel-dev-1883c79a57a5fe25309007590cccb1b2782c41b2.tar.gz | |
rcu: Make task_subsys_state() RCU-lockdep checks handle boot-time use
It is apparently legal to invoke task_subsys_state() without RCU
protection during early boot time. After all, there are no
concurrent tasks, so there can be no grace periods completing
concurrently.
But this does need an Acked-by from the cgroups folks.
Located-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1267311188-16603-2-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cgroup.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index c9bbcb2..a73e1ce 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -489,6 +489,7 @@ static inline struct cgroup_subsys_state *task_subsys_state( { return rcu_dereference_check(task->cgroups->subsys[subsys_id], rcu_read_lock_held() || + !rcu_scheduler_active || cgroup_lock_is_held()); } |
