Commit d8b269e0 authored by Chuyi Zhou's avatar Chuyi Zhou Committed by Tejun Heo
Browse files

cgroup: Remove unused cgroup_subsys::post_attach 



cgroup_subsys::post_attach callback was introduced in commit 5cf1cacb
("cgroup, cpuset: replace cpuset_post_attach_flush() with
cgroup_subsys->post_attach callback") and only cpuset would use this
callback to wait for the mm migration to complete at the end of
__cgroup_procs_write(). Since the previous patch defer the flush operation
until returning to userspace, no one use this callback now. Remove this
callback from cgroup_subsys.

Signed-off-by: default avatarChuyi Zhou <zhouchuyi@bytedance.com>
Acked-by: default avatarWaiman Long <longman@redhat.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 3514309e

include/linux/cgroup-defs.h

+0 −1
Original line number Diff line number Diff line
@@ -763,7 +763,6 @@ struct cgroup_subsys { 
	int (*can_attach)(struct cgroup_taskset *tset);

	void (*cancel_attach)(struct cgroup_taskset *tset);

	void (*attach)(struct cgroup_taskset *tset);

	void (*post_attach)(void);

	int (*can_fork)(struct task_struct *task,

			struct css_set *cset);

	void (*cancel_fork)(struct task_struct *task, struct css_set *cset);

kernel/cgroup/cgroup.c

+0 −4
Original line number Diff line number Diff line
@@ -3033,10 +3033,6 @@ void cgroup_procs_write_finish(struct task_struct *task, bool threadgroup_locked 
	put_task_struct(task);



	cgroup_attach_unlock(threadgroup_locked);



	for_each_subsys(ss, ssid)

		if (ss->post_attach)

			ss->post_attach();

}



static void cgroup_print_ss_mask(struct seq_file *seq, u16 ss_mask)