linux-kernel - Re: [PATCH] blk-mq: fix the cmd_flag

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Date:   Thu, 24 Jan 2019 09:22:04 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Jeff Moyer <jmoyer@...hat.com>,
        Jianchao Wang <jianchao.w.wang@...cle.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blk-mq: fix the cmd_flag_name array

On 1/24/19 8:09 AM, Jeff Moyer wrote:
> Jianchao Wang <jianchao.w.wang@...cle.com> writes:
> 
>> Swap REQ_NOWAIT and REQ_NOUNMAP and add REQ_HIPRI.
>>
>> Signed-off-by: Jianchao Wang <jianchao.w.wang@...cle.com>
>> ---
>>  block/blk-mq-debugfs.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
>> index 90d6876..f812083 100644
>> --- a/block/blk-mq-debugfs.c
>> +++ b/block/blk-mq-debugfs.c
>> @@ -308,8 +308,9 @@ static const char *const cmd_flag_name[] = {
>>  	CMD_FLAG_NAME(PREFLUSH),
>>  	CMD_FLAG_NAME(RAHEAD),
>>  	CMD_FLAG_NAME(BACKGROUND),
>> -	CMD_FLAG_NAME(NOUNMAP),
>>  	CMD_FLAG_NAME(NOWAIT),
>> +	CMD_FLAG_NAME(NOUNMAP),
>> +	CMD_FLAG_NAME(HIPRI),
>>  };
>>  #undef CMD_FLAG_NAME
> 
> Acked-by: Jeff Moyer <jmoyer@...hat.com>
> 
> You might consider also adding a comment above the req_flag_bits enum
> noting that modifications also need to be propagated to cmd_flag_name.

Agree... These things are notoriously difficult to keep in sync, this
isn't the first time we've had a fixup. Not sure if that situation
is improvable, but at least a comment might help.

-- 
Jens Axboe