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elevator: update the document of elevator_switch

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We no longer support falling back to the old io scheduler if switching to
the new one fails. Update the document to indicate that.

Fixes: a1ce35fa49 ("block: remove dead elevator code")
Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/94250961689ba7d2e67a7d9e7995a11166fedb31.1669126766.git.nickyc975@zju.edu.cn
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jinlong Chen 2022-11-22 22:21:23 +08:00 committed by Jens Axboe
parent 93c68cc46a
commit ac1171bd2c
1 changed files with 4 additions and 4 deletions
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8
block/elevator.c
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@ -650,10 +650,10 @@ void elevator_init_mq(struct request_queue *q)
}
/*
* switch to new_e io scheduler. be careful not to introduce deadlocks -
* we don't free the old io scheduler, before we have allocated what we
* need for the new one. this way we have a chance of going back to the old
* one, if the new one fails init for some reason.
* Switch to new_e io scheduler.
*
* If switching fails, we are most likely running out of memory and not able
* to restore the old io scheduler, so leaving the io scheduler being none.
*/
int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
{