diff options
| author | Yasuaki Ishimatsu <yasu.isimatu@gmail.com> | 2016-11-16 08:26:11 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-16 08:26:11 -0700 |
| commit | 92153d30c7c8863022cad684926d71ffaed6a56d (patch) | |
| tree | f1ebf00c6fa2521dec6234ca2b76ebb6c23a49d2 | |
| parent | 0a6219a95f0b0690fb7094acb26002e7a4791197 (diff) | |
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>
| -rw-r--r-- | Documentation/block/null_blk.txt | 2 | ||||
| -rw-r--r-- | drivers/block/null_blk.c | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt index d8880ca30af4..3140dbd860d8 100644 --- a/Documentation/block/null_blk.txt +++ b/Documentation/block/null_blk.txt @@ -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. diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index ba6f4a2e73db..4943ee22716e 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -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) {} |