Hi Ming Lei
Thanks for your quick comment.
As the function request_to_qc_t() in 'include/linux/blk-mq.h ' used the magic '-1',
Seems it is hard to replace it with BLK_MQ_NO_TAG :(

-----Original Message-----
From: Ming Lei [mailto:ming.lei@redhat.com] 
Sent: Wednesday, August 26, 2020 12:29 PM
To: tianxianting (RD) <redacted>
Cc: axboe@kernel.dk; linux-block@vger.kernel.org; linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [v2] blk-mq: use BLK_MQ_NO_TAG for no tag

On Wed, Aug 26, 2020 at 10:06:51AM +0800, Xianting Tian wrote:

Replace various magic -1 constants for tags with BLK_MQ_NO_TAG.
And move the definition of BLK_MQ_NO_TAG from 'block/blk-mq-tag.h'
to 'include/linux/blk-mq.h'

All three symbols are supposed for block core internal code only, so looks you shouldn't move them to public header.


Thanks,
Ming