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[PATCH] ll_rw_blk: cleanup __make_request() 

- Don't assign variables that are only used once.

- Kill spin_lock() prefetching, it's opportunistic at best.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-07-18 04:14:45 +02:00 committed by Jens Axboe
parent cb78b285c8
commit 51da90fcb6
1 changed files with 7 additions and 15 deletions
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22
block/ll_rw_blk.c
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@ -2885,17 +2885,11 @@ static void init_request_from_bio(struct request *req, struct bio *bio)
static int __make_request(request_queue_t *q, struct bio *bio)
{
struct request *req;
int el_ret, rw, nr_sectors, cur_nr_sectors, barrier, err, sync;
unsigned short prio;
sector_t sector;
int el_ret, nr_sectors, barrier, err;
const unsigned short prio = bio_prio(bio);
const int sync = bio_sync(bio);
sector = bio->bi_sector;
nr_sectors = bio_sectors(bio);
cur_nr_sectors = bio_cur_sectors(bio);
prio = bio_prio(bio);
rw = bio_data_dir(bio);
sync = bio_sync(bio);
/*
* low level driver can indicate that it wants pages above a
@ -2904,8 +2898,6 @@ static int __make_request(request_queue_t *q, struct bio *bio)
*/
blk_queue_bounce(q, &bio);
spin_lock_prefetch(q->queue_lock);
barrier = bio_barrier(bio);
if (unlikely(barrier) && (q->next_ordered == QUEUE_ORDERED_NONE)) {
err = -EOPNOTSUPP;
@ -2953,9 +2945,9 @@ static int __make_request(request_queue_t *q, struct bio *bio)
* not touch req->buffer either...
*/
req->buffer = bio_data(bio);
req->current_nr_sectors = cur_nr_sectors;
req->hard_cur_sectors = cur_nr_sectors;
req->sector = req->hard_sector = sector;
req->current_nr_sectors = bio_cur_sectors(bio);
req->hard_cur_sectors = req->current_nr_sectors;
req->sector = req->hard_sector = bio->bi_sector;
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
req->ioprio = ioprio_best(req->ioprio, prio);
drive_stat_acct(req, nr_sectors, 0);
@ -2973,7 +2965,7 @@ static int __make_request(request_queue_t *q, struct bio *bio)
* Grab a free request. This is might sleep but can not fail.
* Returns with the queue unlocked.
*/
req = get_request_wait(q, rw, bio);
req = get_request_wait(q, bio_data_dir(bio), bio);
/*
* After dropping the lock and possibly sleeping here, our request