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blk-mq: Remove blk_mq_queue_data.list 

The block layer core sets blk_mq_queue_data.list but no block
drivers read that member. Hence remove it and also the code that
is used to set this member.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Bart Van Assche 2017-04-05 08:39:18 -07:00 committed by Jens Axboe
parent 142bbdfccc
commit f2fbc9dd78
2 changed files with 0 additions and 18 deletions
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17
block/blk-mq.c
View File

@ -984,16 +984,8 @@ bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *hctx, struct list_head *list)
{
struct request_queue *q = hctx->queue;
struct request *rq;
LIST_HEAD(driver_list);
struct list_head *dptr;
int errors, queued, ret = BLK_MQ_RQ_QUEUE_OK;
/*
* Start off with dptr being NULL, so we start the first request
* immediately, even if we have more pending.
*/
dptr = NULL;
/*
* Now process all the entries, sending them to the driver.
*/
@ -1026,7 +1018,6 @@ bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *hctx, struct list_head *list)
list_del_init(&rq->queuelist);
bd.rq = rq;
bd.list = dptr;
/*
* Flag last if we have no more requests, or if we have more
@ -1062,13 +1053,6 @@ bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *hctx, struct list_head *list)
if (ret == BLK_MQ_RQ_QUEUE_BUSY)
break;
/*
* We've done the first request. If we have more than 1
* left in the list, set dptr to defer issue.
*/
if (!dptr && list->next != list->prev)
dptr = &driver_list;
}
hctx->dispatched[queued_to_index(queued)]++;
@ -1451,7 +1435,6 @@ static void __blk_mq_try_issue_directly(struct request *rq, blk_qc_t *cookie,
struct request_queue *q = rq->q;
struct blk_mq_queue_data bd = {
.rq = rq,
.list = NULL,
.last = 1
};
struct blk_mq_hw_ctx *hctx;

1
include/linux/blk-mq.h
View File

@ -81,7 +81,6 @@ struct blk_mq_tag_set {
struct blk_mq_queue_data {
struct request *rq;
struct list_head *list;
bool last;
};