On 5/2/23 09:38, Michal Koutný wrote:
There is no current user and there are alternative methods to obtain
task's cgroup path.
Signed-off-by: Michal Koutný <mkoutny@xxxxxxxx>
---
kernel/cgroup/cgroup.c | 39 ---------------------------------------
1 file changed, 39 deletions(-)
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 625d7483951c..55e5f0110e3b 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -2378,45 +2378,6 @@ 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
I went to a few of earlier Linux version down to v3.11.
task_cgroup_path() doesn't seems to have any users in my few attempts.
Anyway,
Reviewed-by: Waiman Long <longman@xxxxxxxxxx>
