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authorJens Axboe <axboe@kernel.dk>2018-01-10 21:30:56 +0300
committerJens Axboe <axboe@kernel.dk>2018-01-10 21:47:43 +0300
commit76a86f9d027b342b8759a4b2f9f7fe046e284220 (patch)
tree05037d9a7d2b1057a01202fc989295e0f2ac51c2
parent5d75d3f2e736d6c8be79b677e10edb6af1bf7ed6 (diff)
downloadlinux-76a86f9d027b342b8759a4b2f9f7fe046e284220.tar.xz
block: remove REQ_ATOM_POLL_SLEPT
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 <bart.vanassche@wdc.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/blk-mq-debugfs.c2
-rw-r--r--block/blk-mq.c5
-rw-r--r--block/blk.h2
-rw-r--r--include/linux/blkdev.h2
4 files changed, 5 insertions, 6 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 25d41151073d..dd890d5e0fbd 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -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
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 266fc4f6b046..3239ca9e199f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -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
diff --git a/block/blk.h b/block/blk.h
index a68dbe312ea3..eb306c52121e 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -124,8 +124,6 @@ void blk_account_io_done(struct request *req);
*/
enum rq_atomic_flags {
REQ_ATOM_COMPLETE = 0,
-
- REQ_ATOM_POLL_SLEPT,
};
/*
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 007a7cf1f262..ba31674d8581 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -127,6 +127,8 @@ typedef __u32 __bitwise req_flags_t;
#define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
/* timeout is expired */
#define RQF_MQ_TIMEOUT_EXPIRED ((__force req_flags_t)(1 << 20))
+/* already slept for hybrid poll */
+#define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 21))
/* flags that prevent us from merging requests: */
#define RQF_NOMERGE_FLAGS \