Commit e7b2dcc5 authored by Li Zefan's avatar Li Zefan Committed by Tejun Heo
Browse files

cgroup: remove cgroup_is_descendant() 



It was used by ns cgroup, and ns cgroup was removed long ago.

Signed-off-by: default avatarLi Zefan <lizefan@huawei.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent cfb5966b

include/linux/cgroup.h

+0 −3
Original line number Diff line number Diff line
@@ -448,9 +448,6 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen); 


int cgroup_task_count(const struct cgroup *cgrp);



/* Return true if cgrp is a descendant of the task's cgroup */

int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task);



/*

 * Control Group taskset, used to pass around set of tasks to cgroup_subsys

 * methods.

kernel/cgroup.c

+0 −28
Original line number Diff line number Diff line
@@ -5035,34 +5035,6 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks) 
	put_css_set_taskexit(cg);

}



/**

 * cgroup_is_descendant - see if @cgrp is a descendant of @task's cgrp

 * @cgrp: the cgroup in question

 * @task: the task in question

 *

 * See if @cgrp is a descendant of @task's cgroup in the appropriate

 * hierarchy.

 *

 * If we are sending in dummytop, then presumably we are creating

 * the top cgroup in the subsystem.

 *

 * Called only by the ns (nsproxy) cgroup.

 */

int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task)

{

	int ret;

	struct cgroup *target;



	if (cgrp == dummytop)

		return 1;



	target = task_cgroup_from_root(task, cgrp->root);

	while (cgrp != target && cgrp!= cgrp->top_cgroup)

		cgrp = cgrp->parent;

	ret = (cgrp == target);

	return ret;

}



static void check_for_release(struct cgroup *cgrp)

{

	/* All of these checks rely on RCU to keep the cgroup