cgroup: fix incorrect destination cgroup in cgroup_update_dfl_csses()
cgroup_update_dfl_csses() should move each task in the subtree to
self; however, it was incorrectly calling cgroup_migrate_add_src()
with the root of the subtree as @dst_cgrp. Fortunately,
cgroup_migrate_add_src() currently uses @dst_cgrp only to determine
the hierarchy and the bug doesn't cause any actual breakages. Fix it.
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c63fce0..50879aa 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2901,7 +2901,7 @@
struct cgrp_cset_link *link;
list_for_each_entry(link, &dsct->cset_links, cset_link)
- cgroup_migrate_add_src(link->cset, cgrp,
+ cgroup_migrate_add_src(link->cset, dsct,
&preloaded_csets);
}
spin_unlock_bh(&css_set_lock);