linux-kernel - [tip:core/urgent] rcu, cgroup: Relax the check in task_subsys_state() as early boot is now handled by lockdep-RCU

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Date:	Thu, 4 Mar 2010 16:32:03 GMT
From:	"tip-bot for Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/urgent] rcu, cgroup: Relax the check in task_subsys_state() as early boot is now handled by lockdep-RCU

Commit-ID:  5ed42b8113667c06a6ff2c72717395b5044d30a1
Gitweb:     http://git.kernel.org/tip/5ed42b8113667c06a6ff2c72717395b5044d30a1
Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Wed, 3 Mar 2010 07:46:58 -0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 4 Mar 2010 12:07:31 +0100

rcu, cgroup: Relax the check in task_subsys_state() as early boot is now handled by lockdep-RCU

This patch removes the check for !rcu_scheduler_active because
this check has been incorporated into rcu_dereference_check().

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: laijs@...fujitsu.com
Cc: dipankar@...ibm.com
Cc: mathieu.desnoyers@...ymtl.ca
Cc: josh@...htriplett.org
Cc: dvhltc@...ibm.com
Cc: niv@...ibm.com
Cc: peterz@...radead.org
Cc: rostedt@...dmis.org
Cc: Valdis.Kletnieks@...edu
Cc: dhowells@...hat.com
LKML-Reference: <1267631219-8713-3-git-send-email-paulmck@...ux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/linux/cgroup.h |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index a73e1ce..c9bbcb2 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -489,7 +489,6 @@ 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());
 }
 
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