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| author |   pengdonglin <pengdonglin@xiaomi.com> | 2025-09-16 12:47:29 +0800 |
|---|---|---|
| committer |   Tejun Heo <tj@kernel.org> | 2025-09-16 08:36:14 -1000 |
| commit | 3ee4211ef8693377f67624a46b4f8577f6a495d9 (patch) | |
| tree | 17e0eac8b8764e5ba52c72857b98fcb1cb5f1ae4 /scripts/basic/git:/ssh:/git@git.zx2c4.com | |
| parent | cgroup: replace global percpu_rwsem with per threadgroup resem when writing to cgroup.procs (diff) | |
cgroup: Remove redundant rcu_read_lock/unlock() in spin_lock
Since commit a8bb74acd8efe ("rcu: Consolidate RCU-sched update-side function definitions")
there is no difference between rcu_read_lock(), rcu_read_lock_bh() and
rcu_read_lock_sched() in terms of RCU read section and the relevant grace
period. That means that spin_lock(), which implies rcu_read_lock_sched(),
also implies rcu_read_lock().
There is no need no explicitly start a RCU read section if one has already
been started implicitly by spin_lock().
Simplify the code and remove the inner rcu_read_lock() invocation.
Cc: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Waiman Long <longman@redhat.com>
Signed-off-by: pengdonglin <pengdonglin@xiaomi.com>
Signed-off-by: pengdonglin <dolinux.peng@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'scripts/basic/git:/ssh:/git@git.zx2c4.com')
0 files changed, 0 insertions, 0 deletions