blk-mq: short cut the IPI path in blk_mq_force_complete_rq for !SMP

Let the compile optimize out the entire IPI path, given that we are
obviously not going to use it.

Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-mq.c b/block/blk-mq.c
index ea083f5..eef2f3c 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -727,7 +727,8 @@ void blk_mq_force_complete_rq(struct request *rq)
                return;
        }
 
-       if (!test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) {
+       if (!IS_ENABLED(CONFIG_SMP) ||
+           !test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) {
                q->mq_ops->complete(rq);
                return;
        }