Re: [PATCH 5/5] blk-mq: Drop 'reserved' member of busy_tag_iter_fn

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On 6/17/22 03:55, John Garry wrote:
We no longer use the 'reserved' member in for any iter function so it
                                         ^^^^^^
One of these two words probably should be removed.

diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 2dcd738c6952..b8cc8b41553f 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -266,7 +266,6 @@ static bool bt_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data)
  	struct blk_mq_hw_ctx *hctx = iter_data->hctx;
  	struct request_queue *q = iter_data->q;
  	struct blk_mq_tag_set *set = q->tag_set;
-	bool reserved = iter_data->reserved;
  	struct blk_mq_tags *tags;
  	struct request *rq;
  	bool ret = true;
@@ -276,7 +275,7 @@ static bool bt_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data)
  	else
  		tags = hctx->tags;
- if (!reserved)
+	if (!iter_data->reserved)
  		bitnr += tags->nr_reserved_tags;
  	/*
  	 * We can hit rq == NULL here, because the tagging functions

Is the above change really necessary?

@@ -337,12 +336,11 @@ static bool bt_tags_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data)
  {
  	struct bt_tags_iter_data *iter_data = data;
  	struct blk_mq_tags *tags = iter_data->tags;
-	bool reserved = iter_data->flags & BT_TAG_ITER_RESERVED;
  	struct request *rq;
  	bool ret = true;
  	bool iter_static_rqs = !!(iter_data->flags & BT_TAG_ITER_STATIC_RQS);
- if (!reserved)
+	if (!(iter_data->flags & BT_TAG_ITER_RESERVED))
  		bitnr += tags->nr_reserved_tags;
/*

Same question here: is the above change really necessary?

Thanks,

Bart.



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