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authorJinlong Chen <nickyc975@zju.edu.cn>2022-11-22 17:21:24 +0300
committerJens Axboe <axboe@kernel.dk>2022-11-23 16:48:08 +0300
commite0cca8bc9cd8d6176921cb3f5f466d3ccfbc6b99 (patch)
treedea3c5eaf51c93df9492117fafb1200a824ea730 /block
parentac1171bd2c7a3a32dfbdd3c347919fee32b745a1 (diff)
downloadlinux-e0cca8bc9cd8d6176921cb3f5f466d3ccfbc6b99.tar.xz
elevator: printk a warning if switching to a new io scheduler fails
printk a warning to indicate that the io scheduler has been set to none if switching to a new io scheduler fails. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/d51ed0fb457db7a4f9cbb0dbce36d534e22be457.1669126766.git.nickyc975@zju.edu.cn Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/elevator.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 01aa9f38f22e..1fa45717b1d6 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -683,6 +683,12 @@ int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
out_unfreeze:
blk_mq_unquiesce_queue(q);
blk_mq_unfreeze_queue(q);
+
+ if (ret) {
+ pr_warn("elv: switch to \"%s\" failed, falling back to \"none\"\n",
+ new_e->elevator_name);
+ }
+
return ret;
}