linux-kernel - [tip:sched/core] sched/cpuacct: No need to check subsys active state

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Date:	Wed, 10 Apr 2013 06:48:32 -0700
From:	tip-bot for Li Zefan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, tj@...nel.org, tglx@...utronix.de,
	lizefan@...wei.com
Subject: [tip:sched/core] sched/cpuacct:
  No need to check subsys active state

Commit-ID:  a2b0ae25fc8bfeeb4022b8e847ab811b3c8368d1
Gitweb:     http://git.kernel.org/tip/a2b0ae25fc8bfeeb4022b8e847ab811b3c8368d1
Author:     Li Zefan <lizefan@...wei.com>
AuthorDate: Fri, 29 Mar 2013 14:44:28 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 10 Apr 2013 13:54:22 +0200

sched/cpuacct: No need to check subsys active state

Now we're guaranteed when cpuacct_charge() and
cpuacct_account_field() are called, cpuacct has already been
properly initialized, so we no longer need those checks.

Signed-off-by: Li Zefan <lizefan@...wei.com>
Cc: Tejun Heo <tj@...nel.org>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/5155384C.7000508@huawei.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/cpuacct.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index 75e46d2..ef57ab6 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -247,9 +247,6 @@ void cpuacct_charge(struct task_struct *tsk, u64 cputime)
 	struct cpuacct *ca;
 	int cpu;
 
-	if (unlikely(!cpuacct_subsys.active))
-		return;
-
 	cpu = task_cpu(tsk);
 
 	rcu_read_lock();
@@ -278,9 +275,6 @@ void cpuacct_account_field(struct task_struct *p, int index, u64 val)
 	struct kernel_cpustat *kcpustat;
 	struct cpuacct *ca;
 
-	if (unlikely(!cpuacct_subsys.active))
-		return;
-
 	rcu_read_lock();
 	ca = task_ca(p);
 	while (ca != &root_cpuacct) {
--
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