linux-kernel - [PATCH 4/5] cpuacct: No need to check subsys active state

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Message-ID: <5153EF7B.1020403@huawei.com>
Date:	Thu, 28 Mar 2013 15:21:31 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: [PATCH 4/5] 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>
---
 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) {
-- 
1.8.0.2
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