[PATCH 4.4 063/342] bcache: Add a cond_resched() call to gc

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

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

From: Kent Overstreet <redacted>

commit c5f1e5adf956e3ba82d204c7c141a75da9fa449a upstream.

Signed-off-by: Takashi Iwai <redacted>
Tested-by: Eric Wheeler <redacted>
Cc: Kent Overstreet <redacted>
Signed-off-by: Jens Axboe <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/bcache/btree.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c

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