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authorJinlong Chen <nickyc975@zju.edu.cn>2022-11-22 17:21:23 +0300
committerJens Axboe <axboe@kernel.dk>2022-11-23 16:47:46 +0300
commitac1171bd2c7a3a32dfbdd3c347919fee32b745a1 (patch)
treeb79a6abca07ca1c90e18a576b7dfc5edffee557a /block
parent93c68cc46a070775cc6675e3543dd909eb9f6c9e (diff)
downloadlinux-ac1171bd2c7a3a32dfbdd3c347919fee32b745a1.tar.xz
elevator: update the document of elevator_switch
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: a1ce35fa4985 ("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>
Diffstat (limited to 'block')
-rw-r--r--block/elevator.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/block/elevator.c b/block/elevator.c
index a5bdc3b1e7e5..01aa9f38f22e 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -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)
{