linux-kernel - [PATCH -next] cpuset: initialize cpuset a bit early

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Message-ID: <54F6CBCD.50009@huawei.com>
Date:	Wed, 4 Mar 2015 17:09:33 +0800
From:	Zefan Li <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Ming Lei <tom.leiming@...il.com>,
	Vladimir Davydov <vdavydov@...allels.com>
Subject: [PATCH -next] cpuset: initialize cpuset a bit early

Now we call ss->bind() in cgroup_init(), so cgroup_init() will
call cpuset_bind() and then the latter will access top_cpuset's
cpumask, which is NULL, because cpuset_init() is called after
cgroup_init()

The simplest fix is to swap cgroup_init() and cpuset_init().

Cc: Vladimir Davydov <vdavydov@...allels.com>
Fixes: 295458e67284 ("cgroup: call cgroup_subsys->bind on cgroup subsys initialization")
Reported by: Ming Lei <tom.leiming@...il.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 init/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init/main.c b/init/main.c
index 61b9937..50d1e95 100644
--- a/init/main.c
+++ b/init/main.c
@@ -667,8 +667,8 @@ asmlinkage __visible void __init start_kernel(void)
 	page_writeback_init();
 	proc_root_init();
 	nsfs_init();
-	cgroup_init();
 	cpuset_init();
+	cgroup_init();
 	taskstats_init_early();
 	delayacct_init();
 
-- 
1.8.0.2

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