[added to the 4.1 stable tree] bcache: Add a cond_resched() call to gc

From: Kent Overstreet <redacted>

This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.

===============

[ Upstream commit c5f1e5adf956e3ba82d204c7c141a75da9fa449a ]

Signed-off-by: Takashi Iwai <redacted>
Tested-by: Eric Wheeler <redacted>
Cc: Kent Overstreet <redacted>
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Sasha Levin <redacted>
---
 drivers/md/bcache/btree.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 9aaa8f8..43829d9 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c

@@ -1741,6 +1741,7 @@ static void bch_btree_gc(struct cache_set *c)
 	do {
 		ret = btree_root(gc_root, c, &op, &writes, &stats);
 		closure_sync(&writes);
+		cond_resched();
 
 		if (ret && ret != -EAGAIN)
 			pr_warn("gc failed!");

-- 
2.5.0