bcache: check return value of register_shrinker

[ 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 <mlyle@lyle.org>
Reviewed-by: Vojtech Pavlik <vojtech@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 5b815e6..a5a6909 100644 (file)
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -808,7 +808,10 @@ int bch_btree_cache_alloc(struct cache_set *c)
        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;
 }