Re: drm/debugfs: Drop conditionals around of_node pointers

From: Sui Jingfeng <sui.jingfeng@linux.dev>
To: "Doug Anderson" <dianders@chromium.org>, 隋景峰 <suijingfeng@bosc.ac.cn>
Cc: Maxime Ripard <mripard@kernel.org>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	Biju Das <biju.das.jz@bp.renesas.com>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: drm/debugfs: Drop conditionals around of_node pointers
Date: Wed, 1 May 2024 12:36:17 +0800	[thread overview]
Message-ID: <a59cdfc1-7cc0-4944-b527-68c3ff981529@linux.dev> (raw)
In-Reply-To: <CAD=FV=W2ksFLtv3o5tqrpXY4aHD_wUq7R7rT9hOHCQa8FLmeoQ@mail.gmail.com>

Hi,

On 2024/5/1 05:33, Doug Anderson wrote:
> Hi,
>
> On Mon, Apr 29, 2024 at 6:16 PM 隋景峰 <suijingfeng@bosc.ac.cn> wrote:
>> Hi,
>>
>>
>>> -----原始邮件-----
>>> 发件人: "Maxime Ripard" <mripard@kernel.org>
>>> 发送时间: 2024-04-29 19:30:24 (星期一)
>>> 收件人: "Sui Jingfeng" <suijingfeng@bosc.ac.cn>
>>> 抄送: "Sui Jingfeng" <sui.jingfeng@linux.dev>, "Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>, "Thomas Zimmermann" <tzimmermann@suse.de>, "David Airlie" <airlied@gmail.com>, "Daniel Vetter" <daniel@ffwll.ch>, "Douglas Anderson" <dianders@chromium.org>, "Laurent Pinchart" <laurent.pinchart+renesas@ideasonboard.com>, "Biju Das" <biju.das.jz@bp.renesas.com>, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
>>> 主题: Re: drm/debugfs: Drop conditionals around of_node pointers
>>>
>>> On Sun, Apr 28, 2024 at 04:52:13PM +0800, Sui Jingfeng wrote:
>>>> ping
>>>>
>>>> 在 2024/3/22 06:22, Sui Jingfeng 写道:
>>>>> Having conditional around the of_node pointer of the drm_bridge structure
>>>>> turns out to make driver code use ugly #ifdef blocks.
>>> The code being ugly is an opinion, what problem is it causing exactly?
>>>
>>>> Drop the conditionals to simplify debugfs.
>>> What does it simplifies?
>>>
>>>>> Fixes: d8dfccde2709 ("drm/bridge: Drop conditionals around of_node pointers")
>>>>> Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
>>> Why do we want to backport that patch to stable?
> Technically it's not CCing stable and so it's not really incorrect.
> ...but I agree that this is a bit of a stretch to call it a "Fix".
> Maybe drop the "Fixes" line?

OK, good idea, acceptable.

Originally, I add the fix tag to hint that my modification belongs to
the commit d8dfccde2709 ("drm/bridge: Drop conditionals around of_node pointers") too.
But get missed.

>
>> My commit message is written based on commit of d8dfccde2709
>>
>> $ git show c9e358dfc4a8
>>
>>      This patch is based on commit c9e358dfc4a8 ("driver-core: remove
>>      conditionals around devicetree pointers").
>>
>>      Having conditional around the of_node pointer of the drm_bridge
>>      structure turns out to make driver code use ugly #ifdef blocks. Drop the
>>      conditionals to simplify drivers. While this slightly increases the size
>>      of struct drm_bridge on non-OF system, the number of bridges used today
>>      and foreseen tomorrow on those systems is very low, so this shouldn't be
>>      an issue.
>>
>>      So drop #if conditionals by adding struct device_node forward declaration.
>>
>>> Maxime
>> I'm just start to contribute by mimic other people's tone, there seems no need
>> to over read.
> I think the fact that you skipped the reference to commit c9e358dfc4a8
> ("driver-core: remove conditionals around devicetree pointers") was
> relevant here. Referencing that commit makes it easy for the reader to
> see that you are following convention used throughout the kernel and
> not just asserting your own opinion about style.
>
> If you add that reference into your commit message and send a v2, I'm
> happy to apply it.

OK, thanks a lot.

> -Doug

-- 
Best regards,
Sui