linux-kernel - [PATCH 1/4] cgroup: export cgrp_dfl

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Date:	Sun,  2 Aug 2015 16:23:41 -0400
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk, hannes@...xchg.org, lizefan@...wei.com
Cc:	linux-kernel@...r.kernel.org, vgoyal@...hat.com,
	avanzini.arianna@...il.com, cgroups@...r.kernel.org,
	kernel-team@...com, Tejun Heo <tj@...nel.org>
Subject: [PATCH 1/4] 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@...nel.org>
Cc: Li Zefan <lizefan@...wei.com>
Cc: Johannes Weiner <hannes@...xchg.org>
---
 kernel/cgroup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 1276569..9c8eb17 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -145,6 +145,7 @@ static const char *cgroup_subsys_name[] = {
  * 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
-- 
2.4.3

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