linux-kernel - RE: [PATCH] blk-mq: use BLK_MQ_NO

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Date:   Mon, 24 Aug 2020 06:18:33 +0000
From:   Tianxianting <tian.xianting@....com>
To:     Jens Axboe <axboe@...nel.dk>, "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "kafai@...com" <kafai@...com>,
        "songliubraving@...com" <songliubraving@...com>,
        "yhs@...com" <yhs@...com>, "andriin@...com" <andriin@...com>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "kpsingh@...omium.org" <kpsingh@...omium.org>
CC:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] blk-mq: use BLK_MQ_NO_TAG for no tag

Hi Jens
Sorry to trouble you, I am very sorry for taking it for granted for the patch compile.

I checked, compile for the two changed files are OK:
block/blk-core.c
block/blk-mq-sched.c

Compile failed for the function in below header file:
include/linux/blk-mq.h: request_to_qc_t()
-       if (rq->tag != -1)
+       if (rq->tag != BLK_MQ_NO_TAG)

BLK_MQ_NO_TAG is defined in 'block/blk-mq-tag.h',  if I include this header file in 'include/linux/blk-mq.h' via '#include "../../block/blk-mq-tag.h"', 
Many other similar compile failed happen, for example:
In file included from ./include/linux/../../block/blk-mq-tag.h:5:0,
                 from ./include/linux/blk-mq.h:8,
                 from block/blk.h:6,
                 from block/bio.c:24:
./include/linux/../../block/blk-mq.h:21:29: error: ‘HCTX_MAX_TYPES’ undeclared here (not in a function); did you mean ‘KOBJ_NS_TYPES’?
   struct list_head rq_lists[HCTX_MAX_TYPES];
                             ^~~~~~~~~~~~~~
If I moved below BLK_MQ_NO_TAG definition to 'include/linux/blk-mq.h', all kernel compiles are ok with the patch.
enum {
        BLK_MQ_NO_TAG           = -1U,
        BLK_MQ_TAG_MIN          = 1,
        BLK_MQ_TAG_MAX          = BLK_MQ_NO_TAG - 1,
};
Will you accept above moving of BLK_MQ_NO_TAG to 'include/linux/blk-mq.h'?   
Thanks

-----Original Message-----
From: Jens Axboe [mailto:axboe@...nel.dk] 
Sent: Monday, August 24, 2020 4:58 AM
To: tianxianting (RD) <tian.xianting@....com>; ast@...nel.org; daniel@...earbox.net; kafai@...com; songliubraving@...com; yhs@...com; andriin@...com; john.fastabend@...il.com; kpsingh@...omium.org
Cc: linux-block@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blk-mq: use BLK_MQ_NO_TAG for no tag

On 8/23/20 9:44 AM, Xianting Tian wrote:
> Replace various magic -1 constants for tags with BLK_MQ_NO_TAG.

Doesn't look like this patch was even compiled...

-- 
Jens Axboe