On Mon, May 10, 2021 at 2:40 PM Roman Gushchin [off-list ref] wrote:

After the introduction of the cgroup.kill there is only one call site
of cgroup_task_freeze() left: cgroup_exit(). cgroup_task_freeze() is
currently taking rcu_read_lock() to read task's cgroup flags, but
because it's always called with css_set_lock locked, the rcu protection
is excessive.

Simplify the code by inlining cgroup_task_freeze().

v2: fix build

Signed-off-by: Roman Gushchin <redacted>

Reviewed-by: Shakeel Butt <redacted>