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cgroup: remove cgroup_is_descendant()

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

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Li Zefan 2013-03-12 15:35:58 -07:00 committed by Tejun Heo
parent cfb5966bef
commit e7b2dcc52b
2 changed files with 0 additions and 31 deletions
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3
include/linux/cgroup.h
View File

@ -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.

28
kernel/cgroup.c
View File

@ -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