cgroup: reorder cgroup_migrate()'s parameters
cgroup_migrate() has the destination cgroup as the first parameter
while cgroup_task_migrate() has the destination cset as the last.
Another migration function is scheduled to be added which can make the
discrepancy further stand out. Let's reorder cgroup_migrate()'s
parameters so that the destination cgroup is the last.
This doesn't cause any functional difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 7f4b85a..dc079560 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2362,9 +2362,9 @@
/**
* cgroup_migrate - migrate a process or task to a cgroup
- * @cgrp: the destination cgroup
* @leader: the leader of the process or the task to migrate
* @threadgroup: whether @leader points to the whole process or a single task
+ * @cgrp: the destination cgroup
*
* Migrate a process or task denoted by @leader to @cgrp. If migrating a
* process, the caller must be holding cgroup_threadgroup_rwsem. The
@@ -2378,8 +2378,8 @@
* decided for all targets by invoking group_migrate_prepare_dst() before
* actually starting migrating.
*/
-static int cgroup_migrate(struct cgroup *cgrp, struct task_struct *leader,
- bool threadgroup)
+static int cgroup_migrate(struct task_struct *leader, bool threadgroup,
+ struct cgroup *cgrp)
{
struct cgroup_taskset tset = {
.src_csets = LIST_HEAD_INIT(tset.src_csets),
@@ -2516,7 +2516,7 @@
/* prepare dst csets and commit */
ret = cgroup_migrate_prepare_dst(dst_cgrp, &preloaded_csets);
if (!ret)
- ret = cgroup_migrate(dst_cgrp, leader, threadgroup);
+ ret = cgroup_migrate(leader, threadgroup, dst_cgrp);
cgroup_migrate_finish(&preloaded_csets);
return ret;
@@ -2823,7 +2823,7 @@
goto out_finish;
last_task = task;
- ret = cgroup_migrate(src_cset->dfl_cgrp, task, true);
+ ret = cgroup_migrate(task, true, src_cset->dfl_cgrp);
put_task_struct(task);
@@ -3905,7 +3905,7 @@
css_task_iter_end(&it);
if (task) {
- ret = cgroup_migrate(to, task, false);
+ ret = cgroup_migrate(task, false, to);
put_task_struct(task);
}
} while (task && !ret);
