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cgroup: remove unused task_cgroup_path()

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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>
This commit is contained in:
Miaohe Lin
2023-06-10 11:57:37 +08:00
committed by Tejun Heo
parent 5273ee254e
commit d16b3af466
2 changed files with 0 additions and 40 deletions
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1
include/linux/cgroup.h
View File

@@ -118,7 +118,6 @@ int cgroup_rm_cftypes(struct cftype *cfts);
void cgroup_file_notify(struct cgroup_file *cfile); void cgroup_file_notify(struct cgroup_file *cfile);
void cgroup_file_show(struct cgroup_file *cfile, bool show); 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 cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *tsk); struct pid *pid, struct task_struct *tsk);

39
kernel/cgroup/cgroup.c
View File

@@ -2364,45 +2364,6 @@ int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
} }
EXPORT_SYMBOL_GPL(cgroup_path_ns); 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() * cgroup_attach_lock - Lock for ->attach()
* @lock_threadgroup: whether to down_write cgroup_threadgroup_rwsem * @lock_threadgroup: whether to down_write cgroup_threadgroup_rwsem