cgroup: export cgrp_dfl_root
While cgroup subsystems can't be modules, blkcg supports dynamically
loadable policies which interact with cgroup core. Export
cgrp_dfl_root so that cgroup_on_dfl() can be used in those modules.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f89d929..3f66416 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -145,6 +145,7 @@
* part of that cgroup.
*/
struct cgroup_root cgrp_dfl_root;
+EXPORT_SYMBOL_GPL(cgrp_dfl_root);
/*
* The default hierarchy always exists but is hidden until mounted for the
