[PATCH 3.16.y-ckt 061/180] bcache: Add a cond_resched() call to gc

[Luis Henriques]

3.16.7-ckt24 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Kent Overstreet <kmo at daterainc.com>

commit c5f1e5adf956e3ba82d204c7c141a75da9fa449a upstream.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
Tested-by: Eric Wheeler <bcache at linux.ewheeler.net>
Cc: Kent Overstreet <kmo at daterainc.com>
Signed-off-by: Jens Axboe <axboe at fb.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 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 40a7a05e42ef..181d3fc29957 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -1729,6 +1729,7 @@ 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!");