Commit f8db3835 authored Nov 06, 2019 by Jan Kara Committed by Jens Axboe Nov 06, 2019

block: Warn if elevator= parameter is used



With transition to blk-mq, the elevator= kernel argument was removed as
it makes less and less sense with the current variety of devices.  Since
this may surprise some users and there are advices on the Internet that
still suggest to use it, let's at least warn if the parameter is used.

Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent fa532287

block/elevator.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -831,3 +831,12 @@ struct request elv_rb_latter_request(struct request_queue q,
		return NULL;
		}
		EXPORT_SYMBOL(elv_rb_latter_request);

		static int __init elevator_setup(char *str)
		{
		pr_warn("Kernel parameter elevator= does not have any effect anymore.\n"
		"Please use sysfs to set IO scheduler for individual devices.\n");
		return 1;
		}

		__setup("elevator=", elevator_setup);

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