cgroup: remove unused task_cgroup_path()

task_cgroup_path() is not used anymore. So remove it.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 885f5395fcd04e5e5310e8c1019c0ad7ff9b2535..1261a47932a6498a8c1720fcb06169dcfd8ce97b 100644 (file)
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -118,7 +118,6 @@ int cgroup_rm_cftypes(struct cftype *cfts);
 void cgroup_file_notify(struct cgroup_file *cfile);
 void cgroup_file_show(struct cgroup_file *cfile, bool show);
 
-int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
 int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
 int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
                     struct pid *pid, struct task_struct *tsk);

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 57f31b2344339230a6a8652fbc8146cc8e27d74c..04d1c0cde8824a2def63b3a002ec43abf2cde699 100644 (file)
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -2364,45 +2364,6 @@ int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
 }
 EXPORT_SYMBOL_GPL(cgroup_path_ns);
 
-/**
- * task_cgroup_path - cgroup path of a task in the first cgroup hierarchy
- * @task: target task
- * @buf: the buffer to write the path into
- * @buflen: the length of the buffer
- *
- * Determine @task's cgroup on the first (the one with the lowest non-zero
- * hierarchy_id) cgroup hierarchy and copy its path into @buf.  This
- * function grabs cgroup_mutex and shouldn't be used inside locks used by
- * cgroup controller callbacks.
- *
- * Return value is the same as kernfs_path().
- */
-int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen)
-{
-       struct cgroup_root *root;
-       struct cgroup *cgrp;
-       int hierarchy_id = 1;
-       int ret;
-
-       cgroup_lock();
-       spin_lock_irq(&css_set_lock);
-
-       root = idr_get_next(&cgroup_hierarchy_idr, &hierarchy_id);
-
-       if (root) {
-               cgrp = task_cgroup_from_root(task, root);
-               ret = cgroup_path_ns_locked(cgrp, buf, buflen, &init_cgroup_ns);
-       } else {
-               /* if no hierarchy exists, everyone is in "/" */
-               ret = strscpy(buf, "/", buflen);
-       }
-
-       spin_unlock_irq(&css_set_lock);
-       cgroup_unlock();
-       return ret;
-}
-EXPORT_SYMBOL_GPL(task_cgroup_path);
-
 /**
  * cgroup_attach_lock - Lock for ->attach()
  * @lock_threadgroup: whether to down_write cgroup_threadgroup_rwsem