cgroup: remove cgroup_is_descendant()
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>
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@ -448,9 +448,6 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
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int cgroup_task_count(const struct cgroup *cgrp);
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/* Return true if cgrp is a descendant of the task's cgroup */
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int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task);
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/*
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* Control Group taskset, used to pass around set of tasks to cgroup_subsys
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* methods.
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@ -5035,34 +5035,6 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
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put_css_set_taskexit(cg);
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}
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/**
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* cgroup_is_descendant - see if @cgrp is a descendant of @task's cgrp
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* @cgrp: the cgroup in question
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* @task: the task in question
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*
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* See if @cgrp is a descendant of @task's cgroup in the appropriate
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* hierarchy.
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*
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* If we are sending in dummytop, then presumably we are creating
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* the top cgroup in the subsystem.
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*
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* Called only by the ns (nsproxy) cgroup.
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*/
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int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task)
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{
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int ret;
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struct cgroup *target;
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if (cgrp == dummytop)
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return 1;
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target = task_cgroup_from_root(task, cgrp->root);
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while (cgrp != target && cgrp!= cgrp->top_cgroup)
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cgrp = cgrp->parent;
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ret = (cgrp == target);
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return ret;
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}
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static void check_for_release(struct cgroup *cgrp)
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{
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/* All of these checks rely on RCU to keep the cgroup
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