Commit 92153d30 authored by Yasuaki Ishimatsu's avatar Yasuaki Ishimatsu Committed by Jens Axboe
Browse files

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: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>

Massaged the text a bit.

Signed-off-by: default avatarJens 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) {}

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