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    SubjectRe: [PATCH block/for-4.5-fixes] writeback: keep superblock pinned during cgroup writeback association switches
    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

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