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Date:   Mon, 17 Aug 2020 12:09:18 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     axboe@...nel.dk
Cc:     ming.lei@...hat.com, hch@....de, baolin.wang@...ux.alibaba.com,
        baolin.wang7@...il.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH RESEND 4/5] block: Remove blk_mq_attempt_merge() function

The small blk_mq_attempt_merge() function is only called by
__blk_mq_sched_bio_merge(), just open code it.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 block/blk-mq-sched.c | 33 ++++++++++-----------------------
 1 file changed, 10 insertions(+), 23 deletions(-)

diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 8e9bafe..1cc7919 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -408,28 +408,6 @@ bool blk_mq_bio_list_merge(struct request_queue *q, struct list_head *list,
 }
 EXPORT_SYMBOL_GPL(blk_mq_bio_list_merge);
 
-/*
- * Reverse check our software queue for entries that we could potentially
- * merge with. Currently includes a hand-wavy stop count of 8, to not spend
- * too much time checking for merges.
- */
-static bool blk_mq_attempt_merge(struct request_queue *q,
-				 struct blk_mq_hw_ctx *hctx,
-				 struct blk_mq_ctx *ctx, struct bio *bio,
-				 unsigned int nr_segs)
-{
-	enum hctx_type type = hctx->type;
-
-	lockdep_assert_held(&ctx->lock);
-
-	if (blk_mq_bio_list_merge(q, &ctx->rq_lists[type], bio, nr_segs)) {
-		ctx->rq_merged++;
-		return true;
-	}
-
-	return false;
-}
-
 bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
 		unsigned int nr_segs)
 {
@@ -447,7 +425,16 @@ bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
 			!list_empty_careful(&ctx->rq_lists[type])) {
 		/* default per sw-queue merge */
 		spin_lock(&ctx->lock);
-		ret = blk_mq_attempt_merge(q, hctx, ctx, bio, nr_segs);
+		/*
+		 * Reverse check our software queue for entries that we could
+		 * potentially merge with. Currently includes a hand-wavy stop
+		 * count of 8, to not spend too much time checking for merges.
+		 */
+		if (blk_mq_bio_list_merge(q, &ctx->rq_lists[type], bio, nr_segs)) {
+			ctx->rq_merged++;
+			ret = true;
+		}
+
 		spin_unlock(&ctx->lock);
 	}
 
-- 
1.8.3.1

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