linux-next: manual merge of the cgroup tree with Linus' tree

[Stephen Rothwell]

Hi Tejun,

Today's linux-next merge of the cgroup tree got a conflict in
mm/memcontrol.c between commit 6f6acb00514c ("memcg: fix swapcache
charge from kernel thread context") from Linus' tree and commit
ec903c0c858e ("cgroup: rename css_tryget*() to css_tryget_online*()")
from the cgroup tree.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

-- 
Cheers,
Stephen Rothwell                    sfr@xxxxxxxxxxxxxxxx

diff --cc mm/memcontrol.c
index 5177c6d4a2dd,b6f91d61b3af..000000000000
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@@ -1077,19 -1074,10 +1074,19 @@@ static struct mem_cgroup *get_mem_cgrou
  
  	rcu_read_lock();
  	do {
 -		memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
 -		if (unlikely(!memcg))
 +		/*
 +		 * Page cache insertions can happen withou an
 +		 * actual mm context, e.g. during disk probing
 +		 * on boot, loopback IO, acct() writes etc.
 +		 */
 +		if (unlikely(!mm))
  			memcg = root_mem_cgroup;
 +		else {
 +			memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
 +			if (unlikely(!memcg))
 +				memcg = root_mem_cgroup;
 +		}
- 	} while (!css_tryget(&memcg->css));
+ 	} while (!css_tryget_online(&memcg->css));
  	rcu_read_unlock();
  	return memcg;
  }

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