On Thu, Feb 18, 2016 at 12:12:40PM +0200, Nikolay Borisov wrote:

On 02/16/2016 08:24 PM, Tejun Heo wrote:

quoted

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Tahsin Erdogan <redacted>
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