From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH block/for-4.5-fixes] writeback: keep superblock pinned
 during cgroup writeback association switches
Date: Thu, 18 Feb 2016 07:57:24 -0500
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To: Nikolay Borisov <kernel@kyup.com>
Cc: Jens Axboe <axboe@kernel.dk>, Tahsin Erdogan <tahsin@google.com>, cgroups@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>, Nauman Rafique <nauman@google.com>, linux-kernel@vger.kernel.org, Jan Kara <jack@suse.com>

On Thu, Feb 18, 2016 at 12:12:40PM +0200, Nikolay Borisov wrote:
> 
> 
> On 02/16/2016 08:24 PM, Tejun Heo wrote:
> > Signed-off-by: Tejun Heo <tj@kernel.org>
> > Reported-and-tested-by: Tahsin Erdogan <tahsin@google.com>
> > Link: http://lkml.kernel.org/g/CAAeU0aNCq7LGODvVGRU-oU_o-6enii5ey0p1c26D1ZzYwkDc5A@mail.gmail.com
> > Fixes: d10c80955265 ("writeback: implement foreign cgroup inode bdi_writeback switching")
> > Cc: stable@vger.kernel.org #v4.5+
> 
> Why is this tagged for 4.5+ since the commit in question was merged in 4.2?

Up until 4.5, the whole cgroup v2 interface is hidden behind a devel
flag and cgroup writeback can only be used through cgroup v2.

Thanks.

-- 
tejun