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Commit 92153d30 authored Nov 16, 2016 by Yasuaki Ishimatsu Committed by Jens Axboe Nov 16, 2016

null_blk: add usage hints for NVM



If CONFIG_NVM is disabled, loading null_block module with use_lightnvm=1
fails. But there are no messages and documents related to the failure.

Add the appropriate error message.

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>

Massaged the text a bit.

Signed-off-by: Jens Axboe <axboe@fb.com>

parent 0a6219a9

Documentation/block/null_blk.txt

+1 −1

Original line number	Diff line number	Diff line
		@@ -72,4 +72,4 @@ use_per_node_hctx=[0/1]: Default: 0
		queue for each CPU node in the system.

		use_lightnvm=[0/1]: Default: 0
		Register device with LightNVM. Requires blk-mq to be used.
		Register device with LightNVM. Requires blk-mq and CONFIG_NVM to be enabled.

drivers/block/null_blk.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -577,6 +577,7 @@ static void null_nvm_unregister(struct nullb *nullb)
		#else
		static int null_nvm_register(struct nullb *nullb)
		{
		pr_err("null_blk: CONFIG_NVM needs to be enabled for LightNVM\n");
		return -EINVAL;
		}
		static void null_nvm_unregister(struct nullb *nullb) {}