block: get rid of likely/unlikely predictions in merge logic

They tend to depend a lot on the workload, so not a clear-cut
likely or unlikely fit.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 73b2356..651136a 100644 (file)
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -149,9 +149,9 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
 static int blk_hw_contig_segment(struct request_queue *q, struct bio *bio,
                                 struct bio *nxt)
 {
-       if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
+       if (!bio_flagged(bio, BIO_SEG_VALID))
                blk_recount_segments(q, bio);
-       if (unlikely(!bio_flagged(nxt, BIO_SEG_VALID)))
+       if (!bio_flagged(nxt, BIO_SEG_VALID))
                blk_recount_segments(q, nxt);
        if (!BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)) ||
            BIOVEC_VIRT_OVERSIZE(bio->bi_hw_back_size + nxt->bi_hw_front_size))
@@ -312,9 +312,9 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
                        q->last_merge = NULL;
                return 0;
        }
-       if (unlikely(!bio_flagged(req->biotail, BIO_SEG_VALID)))
+       if (!bio_flagged(req->biotail, BIO_SEG_VALID))
                blk_recount_segments(q, req->biotail);
-       if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
+       if (!bio_flagged(bio, BIO_SEG_VALID))
                blk_recount_segments(q, bio);
        len = req->biotail->bi_hw_back_size + bio->bi_hw_front_size;
        if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio))
@@ -352,9 +352,9 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
                return 0;
        }
        len = bio->bi_hw_back_size + req->bio->bi_hw_front_size;
-       if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
+       if (!bio_flagged(bio, BIO_SEG_VALID))
                blk_recount_segments(q, bio);
-       if (unlikely(!bio_flagged(req->bio, BIO_SEG_VALID)))
+       if (!bio_flagged(req->bio, BIO_SEG_VALID))
                blk_recount_segments(q, req->bio);
        if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(req->bio)) &&
            !BIOVEC_VIRT_OVERSIZE(len)) {