4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Lyle <ml...@lyle.org>


[ Upstream commit 6c4ca1e36cdc1a0a7a84797804b87920ccbebf51 ]

register_shrinker is now __must_check, so check it to kill a warning.
Caller of bch_btree_cache_alloc in super.c appropriately checks return
value so this is fully plumbed through.

This V2 fixes checkpatch warnings and improves the commit description,
as I was too hasty getting the previous version out.

Signed-off-by: Michael Lyle <ml...@lyle.org>
Reviewed-by: Vojtech Pavlik <vojt...@suse.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/md/bcache/btree.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -807,7 +807,10 @@ int bch_btree_cache_alloc(struct cache_s
        c->shrink.scan_objects = bch_mca_scan;
        c->shrink.seeks = 4;
        c->shrink.batch = c->btree_pages * 2;
-       register_shrinker(&c->shrink);
+
+       if (register_shrinker(&c->shrink))
+               pr_warn("bcache: %s: could not register shrinker",
+                               __func__);
 
        return 0;
 }


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