linux-kernel - [39/75] memcg: keep root group unchanged if creation fails

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Date:	Tue, 03 Jan 2012 14:33:12 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Hillf Danton <dhillf@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [39/75] memcg: keep root group unchanged if creation fails

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hillf Danton <dhillf@...il.com>

commit a41c58a6665cc995e237303b05db42100b71b65e upstream.

If the request is to create non-root group and we fail to meet it, we
should leave the root unchanged.

Signed-off-by: Hillf Danton <dhillf@...il.com>
Signed-off-by: Hugh Dickins <hughd@...gle.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Acked-by: Michal Hocko <mhocko@...e.cz>
Cc: Balbir Singh <bsingharora@...il.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 mm/memcontrol.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4898,9 +4898,9 @@ mem_cgroup_create(struct cgroup_subsys *
 		int cpu;
 		enable_swap_cgroup();
 		parent = NULL;
-		root_mem_cgroup = mem;
 		if (mem_cgroup_soft_limit_tree_init())
 			goto free_out;
+		root_mem_cgroup = mem;
 		for_each_possible_cpu(cpu) {
 			struct memcg_stock_pcp *stock =
 						&per_cpu(memcg_stock, cpu);
@@ -4939,7 +4939,6 @@ mem_cgroup_create(struct cgroup_subsys *
 	return &mem->css;
 free_out:
 	__mem_cgroup_free(mem);
-	root_mem_cgroup = NULL;
 	return ERR_PTR(error);
 }
 


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