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blk-mq: get rid of ->cmd_size in the hardware queue

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We store it in the tag set, we don't need it in the hardware queue.
While removing cmd_size, place ->queue_num further down to avoid
a hole on 64-bit archs. It's not used in any fast paths, so we
can safely move it.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2015-01-07 10:44:04 -07:00
parent 35b489d32f
commit 17ded32070
2 changed files with 1 additions and 3 deletions
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1
block/blk-mq.c
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@ -1615,7 +1615,6 @@ static int blk_mq_init_hctx(struct request_queue *q,
hctx->queue = q; hctx->queue = q;
hctx->queue_num = hctx_idx; hctx->queue_num = hctx_idx;
hctx->flags = set->flags; hctx->flags = set->flags;
hctx->cmd_size = set->cmd_size;
blk_mq_init_cpu_notifier(&hctx->cpu_notifier, blk_mq_init_cpu_notifier(&hctx->cpu_notifier,
blk_mq_hctx_notify, hctx); blk_mq_hctx_notify, hctx);

3
include/linux/blk-mq.h
View File

@ -34,7 +34,6 @@ struct blk_mq_hw_ctx {
unsigned long flags; /* BLK_MQ_F_* flags */ unsigned long flags; /* BLK_MQ_F_* flags */
struct request_queue *queue; struct request_queue *queue;
unsigned int queue_num;
struct blk_flush_queue *fq; struct blk_flush_queue *fq;
void *driver_data; void *driver_data;
@ -54,7 +53,7 @@ struct blk_mq_hw_ctx {
unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER]; unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
unsigned int numa_node; unsigned int numa_node;
unsigned int cmd_size; /* per-request extra data */ unsigned int queue_num;
atomic_t nr_active; atomic_t nr_active;