From: Mike Snitzer Date: Tue, 16 Dec 2014 17:54:25 +0000 (-0500) Subject: block: mark blk-mq devices as stackable X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ad9cf3bbd18a94806314741ac8092c3422f5aebe;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git block: mark blk-mq devices as stackable Commit 4ee5eaf4 ("block: add a queue flag for request stacking support") introduced the concept of "STACKABLE" and blk-mq devices fit the definition in that they establish q->request_fn. So establish QUEUE_FLAG_STACKABLE in QUEUE_FLAG_MQ_DEFAULT. While not strictly needed (DM _could_ just check for q->mq_ops to assume the device is request-based), request-based DM support for blk-mq devices benefits from the ability to consistently check for QUEUE_FLAG_STACKABLE before allowing a device to be stacked into a request-based DM table. Signed-off-by: Mike Snitzer Signed-off-by: Jens Axboe --- diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 6f388fd1c11c..13e16401a7ce 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -520,6 +520,7 @@ struct request_queue { (1 << QUEUE_FLAG_ADD_RANDOM)) #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ + (1 << QUEUE_FLAG_STACKABLE) | \ (1 << QUEUE_FLAG_SAME_COMP)) static inline void queue_lockdep_assert_held(struct request_queue *q)