From 3eba0505d03a9c1eb30d40c2330c0880b22d1b3a Mon Sep 17 00:00:00 2001 From: Chengming Zhou Date: Sun, 20 Feb 2022 13:14:26 +0800 Subject: sched/cpuacct: Remove redundant RCU read lock The cpuacct_account_field() and it's cgroup v2 wrapper cgroup_account_cputime_field() is only called from cputime in task_group_account_field(), which is already in RCU read-side critical section. So remove these redundant RCU read lock. Suggested-by: Tejun Heo Signed-off-by: Chengming Zhou Signed-off-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20220220051426.5274-3-zhouchengming@bytedance.com --- kernel/sched/cpuacct.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'kernel/sched/cpuacct.c') diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c index f79f88456d72..d269ede84e85 100644 --- a/kernel/sched/cpuacct.c +++ b/kernel/sched/cpuacct.c @@ -352,10 +352,8 @@ void cpuacct_account_field(struct task_struct *tsk, int index, u64 val) { struct cpuacct *ca; - rcu_read_lock(); for (ca = task_ca(tsk); ca != &root_cpuacct; ca = parent_ca(ca)) __this_cpu_add(ca->cpustat->cpustat[index], val); - rcu_read_unlock(); } struct cgroup_subsys cpuacct_cgrp_subsys = { -- cgit v1.2.3-71-gd317