On Wed, 23 Nov 2016, Mikulas Patocka wrote:

From: Mikulas Patocka <mpatocka@redhat.com>

dm-bufio: don't take the lock in dm_bufio_shrink_count

dm_bufio_shrink_count is called from do_shrink_slab to find out how many
freeable objects are there. The reported value doesn't have to be precise,
so we don't need to take the dm-bufio lock.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Acked-by: David Rientjes <rientjes@google.com>