cgroup: relocate cgroup_lock_live_group() and cgroup_attach_task_all()

cgroup_lock_live_group() and cgroup_attach_task() are scheduled to be
made static.  Relocate the former and cgroup_attach_task_all() so that
we don't need forward declarations.

This patch is pure relocation.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 147d7cc..ae76170 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -329,6 +329,24 @@ static inline struct cftype *__d_cft(struct dentry *dentry)
        return __d_cfe(dentry)->type;
 }
 
+/**
+ * cgroup_lock_live_group - take cgroup_mutex and check that cgrp is alive.
+ * @cgrp: the cgroup to be checked for liveness
+ *
+ * On success, returns true; the lock should be later released with
+ * cgroup_unlock(). On failure returns false with no lock held.
+ */
+bool cgroup_lock_live_group(struct cgroup *cgrp)
+{
+       mutex_lock(&cgroup_mutex);
+       if (cgroup_is_removed(cgrp)) {
+               mutex_unlock(&cgroup_mutex);
+               return false;
+       }
+       return true;
+}
+EXPORT_SYMBOL_GPL(cgroup_lock_live_group);
+
 /* the list of cgroups eligible for automatic release. Protected by
  * release_list_lock */
 static LIST_HEAD(release_list);
@@ -1944,30 +1962,6 @@ static void cgroup_task_migrate(struct cgroup *oldcgrp,
 }
 
 /**
- * cgroup_attach_task_all - attach task 'tsk' to all cgroups of task 'from'
- * @from: attach to all cgroups of a given task
- * @tsk: the task to be attached
- */
-int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk)
-{
-       struct cgroupfs_root *root;
-       int retval = 0;
-
-       cgroup_lock();
-       for_each_active_root(root) {
-               struct cgroup *from_cg = task_cgroup_from_root(from, root);
-
-               retval = cgroup_attach_task(from_cg, tsk, false);
-               if (retval)
-                       break;
-       }
-       cgroup_unlock();
-
-       return retval;
-}
-EXPORT_SYMBOL_GPL(cgroup_attach_task_all);
-
-/**
  * cgroup_attach_task - attach a task or a whole threadgroup to a cgroup
  * @cgrp: the cgroup to attach to
  * @tsk: the task or the leader of the threadgroup to be attached
@@ -2204,6 +2198,30 @@ out_unlock_cgroup:
        return ret;
 }
 
+/**
+ * cgroup_attach_task_all - attach task 'tsk' to all cgroups of task 'from'
+ * @from: attach to all cgroups of a given task
+ * @tsk: the task to be attached
+ */
+int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk)
+{
+       struct cgroupfs_root *root;
+       int retval = 0;
+
+       cgroup_lock();
+       for_each_active_root(root) {
+               struct cgroup *from_cg = task_cgroup_from_root(from, root);
+
+               retval = cgroup_attach_task(from_cg, tsk, false);
+               if (retval)
+                       break;
+       }
+       cgroup_unlock();
+
+       return retval;
+}
+EXPORT_SYMBOL_GPL(cgroup_attach_task_all);
+
 static int cgroup_tasks_write(struct cgroup *cgrp, struct cftype *cft, u64 pid)
 {
        return attach_task_by_pid(cgrp, pid, false);
@@ -2214,24 +2232,6 @@ static int cgroup_procs_write(struct cgroup *cgrp, struct cftype *cft, u64 tgid)
        return attach_task_by_pid(cgrp, tgid, true);
 }
 
-/**
- * cgroup_lock_live_group - take cgroup_mutex and check that cgrp is alive.
- * @cgrp: the cgroup to be checked for liveness
- *
- * On success, returns true; the lock should be later released with
- * cgroup_unlock(). On failure returns false with no lock held.
- */
-bool cgroup_lock_live_group(struct cgroup *cgrp)
-{
-       mutex_lock(&cgroup_mutex);
-       if (cgroup_is_removed(cgrp)) {
-               mutex_unlock(&cgroup_mutex);
-               return false;
-       }
-       return true;
-}
-EXPORT_SYMBOL_GPL(cgroup_lock_live_group);
-
 static int cgroup_release_agent_write(struct cgroup *cgrp, struct cftype *cft,
                                      const char *buffer)
 {