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block: remove REQ_ATOM_POLL_SLEPT

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We don't need this to be an atomic flag, it can be a regular
flag. We either end up on the same CPU for the polling, in which
case the state is sane, or we did the sleep which would imply
the needed barrier to ensure we see the right state.

Reviewed-by: Bart Van Assche <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2018-01-10 11:30:56 -07:00
commit 76a86f9d02
4 changed files with 5 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

2
block/blk-mq-debugfs.c
View file

@ -290,13 +290,13 @@ static const char *const rqf_name[] = {
RQF_NAME(SPECIAL_PAYLOAD),
RQF_NAME(ZONE_WRITE_LOCKED),
RQF_NAME(MQ_TIMEOUT_EXPIRED),
RQF_NAME(MQ_POLL_SLEPT),
};
#undef RQF_NAME
#define RQAF_NAME(name) [REQ_ATOM_##name] = #name
static const char *const rqaf_name[] = {
RQAF_NAME(COMPLETE),
RQAF_NAME(POLL_SLEPT),
};
#undef RQAF_NAME

5
block/blk-mq.c
View file

@ -483,7 +483,6 @@ void blk_mq_free_request(struct request *rq)
blk_put_rl(blk_rq_rl(rq));
blk_mq_rq_update_state(rq, MQ_RQ_IDLE);
clear_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags);
if (rq->tag != -1)
blk_mq_put_tag(hctx, hctx->tags, ctx, rq->tag);
if (sched_tag != -1)
@ -2976,7 +2975,7 @@ static bool blk_mq_poll_hybrid_sleep(struct request_queue *q,
unsigned int nsecs;
ktime_t kt;
if (test_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags))
if (rq->rq_flags & RQF_MQ_POLL_SLEPT)
return false;
/*
@ -2996,7 +2995,7 @@ static bool blk_mq_poll_hybrid_sleep(struct request_queue *q,
if (!nsecs)
return false;
set_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags);
rq->rq_flags |= RQF_MQ_POLL_SLEPT;
/*
* This will be replaced with the stats tracking code, using

2
block/blk.h
View file

@ -124,8 +124,6 @@ void blk_account_io_done(struct request *req);
*/
enum rq_atomic_flags {
REQ_ATOM_COMPLETE = 0,
REQ_ATOM_POLL_SLEPT,
};
/*