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| author | Christoph Hellwig <hch@lst.de> | 2020-04-25 09:53:36 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-04-25 09:45:44 -0600 |
| commit | 8cf7961dab42c9177a556b719c15f5b9449c24d1 (patch) | |
| tree | cf0e7e5d0b7f6f0ee665629b61fc91cc56ed77c7 /include/linux/blk-mq.h | |
| parent | ae3cc8d8ff061d3ffca96665685550e70a86472a (diff) | |
| download | linux-stable-8cf7961dab42c9177a556b719c15f5b9449c24d1.tar.gz linux-stable-8cf7961dab42c9177a556b719c15f5b9449c24d1.tar.bz2 linux-stable-8cf7961dab42c9177a556b719c15f5b9449c24d1.zip | |
block: bypass ->make_request_fn for blk-mq drivers
Call blk_mq_make_request when no ->make_request_fn is set. This is
safe now that blk_alloc_queue always sets up the pointer for make_request
based drivers. This avoids an indirect call in the blk-mq driver I/O
fast path, which is rather expensive due to spectre mitigations.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blk-mq.h')
| -rw-r--r-- | include/linux/blk-mq.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 51fbf6f76593..d7307795439a 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -578,4 +578,6 @@ static inline void blk_mq_cleanup_rq(struct request *rq) rq->q->mq_ops->cleanup_rq(rq); } +blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio); + #endif |