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null_blk: add usage hints for NVM

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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 <[email protected]>

Massaged the text a bit.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Yasuaki Ishimatsu 2016-11-16 08:26:11 -07:00 • committed by Jens Axboe
commit 92153d30c7
2 changed files with 2 additions and 1 deletions
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Documentation/block/null_blk.txt
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@ -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.