Re: Re: drm/debugfs: Drop conditionals around of_node pointers

[隋景峰]

Hi,


> -----原始邮件-----
> 发件人: "Maxime Ripard" <mripard@xxxxxxxxxx>
> 发送时间: 2024-04-29 19:30:24 (星期一)
> 收件人: "Sui Jingfeng" <suijingfeng@xxxxxxxxxx>
> 抄送: "Sui Jingfeng" <sui.jingfeng@xxxxxxxxx>, "Maarten Lankhorst" <maarten.lankhorst@xxxxxxxxxxxxxxx>, "Thomas Zimmermann" <tzimmermann@xxxxxxx>, "David Airlie" <airlied@xxxxxxxxx>, "Daniel Vetter" <daniel@xxxxxxxx>, "Douglas Anderson" <dianders@xxxxxxxxxxxx>, "Laurent Pinchart" <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>, "Biju Das" <biju.das.jz@xxxxxxxxxxxxxx>, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
> 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@xxxxxxxxx>
> 
> Why do we want to backport that patch to stable?

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.