block: skip elevator fields init for non-elv queue

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Don't init rq->hash and rq->rb_node in blk_mq_rq_ctx_init() if there is
no elevator. Also, move some other initialisers that imply barriers to
the end, so the compiler is free to rearrange and optimise other the
rest of them.

note: fold in a change from Jens leaving queue_list unconditional, as
it might lead to problems otherwise.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-10-18 21:37:27 +01:00 • committed by Jens Axboe

parent 2ff0682da6

commit 4f266f2be8

1 changed files with 14 additions and 14 deletions

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block/blk-mq.c

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