loop: add blk-mq.h include
Looks like we pull it in through other ways on x86, but we fail
on sparc:
In file included from drivers/block/cryptoloop.c:30:0:
drivers/block/loop.h:63:24: error: field 'tag_set' has incomplete type
struct blk_mq_tag_set tag_set;
Add the include to loop.h, kill it from loop.c.
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/block/loop.h b/drivers/block/loop.h
index e20cdbb..301c27f 100644
--- a/drivers/block/loop.h
+++ b/drivers/block/loop.h
@@ -11,6 +11,7 @@
#include <linux/bio.h>
#include <linux/blkdev.h>
+#include <linux/blk-mq.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>