linux-kernel - Re: [PATCH 1/2] drm/amd/display: change variables type

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Date:   Mon, 25 Jul 2022 22:38:53 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     Magali Lemes <magalilemes00@...il.com>
Cc:     André Almeida <andrealmeid@...lia.com>,
        siqueirajordao@...eup.net, sunpeng.li@....com,
        tales.aparecida@...il.com, airlied@...ux.ie, Xinhui.Pan@....com,
        Rodrigo.Siqueira@....com, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, mairacanal@...eup.net,
        dri-devel@...ts.freedesktop.org, alexander.deucher@....com,
        isabbasso@...eup.net, andrealmeid@...eup.net,
        christian.koenig@....com
Subject: Re: [PATCH 1/2] drm/amd/display: change variables type

On 07/25, Magali Lemes wrote:
> 
> On 7/25/22 16:42, André Almeida wrote:
> > Hi Magali,
> > 
> > Às 15:15 de 25/07/22, Magali Lemes escreveu:
> > > As "dcn3_15_soc" and "dcn3_16_soc" are of type "struct
> > > _vcs_dpi_soc_bounding_box_st", change their types accordingly.
> > > 
> > I can see that indeed this type change sense for those variables, but
> > isn't a bit strange that the type was wrong in the first place? I wonder
> > if this variable is even used, given that it would very likely throw a
> > compiler error when using the wrong type and trying to access struct
> > members that aren't defined.
> 
> 
> A compilation error would be thrown if either "dc/dcn315/dcn315_resource.h"
> or "dc/dcn316/dcn316_resource.h" were included in the files where
> "dcn3_15_soc" and "dcn3_16_soc" are initialized. Since they are not
> included, the wrong variable type error is not shown.
> To solve the sparse warning in the second patch of this series, those
> variables need to be declared first, but they are already declared, we're
> only missing the headers. If I only add the headers, then those variables
> will be seen, and I get the expected incompatible variables types error. So,
> fixing the types here is a preliminary work for the next patch.
> 

Hi Magali,

Thanks for inspecting it. What you say makes sense, but André pointed
out something that makes sense to me too.

As fas as I checked, dcn3_15_soc and dcn16_soc is not used outside their
respective FPU files. Maybe the proper solution is removing those
declarations (and make the struct static). Can you take a look at it?

Best Regards,

Melissa
> 
> Magali
> 
> 
> > 
> > > Signed-off-by: Magali Lemes <magalilemes00@...il.com>
> > > ---
> > >   drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.h | 2 +-
> > >   drivers/gpu/drm/amd/display/dc/dcn316/dcn316_resource.h | 2 +-
> > >   2 files changed, 2 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.h b/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.h
> > > index 39929fa67a51..45276317c057 100644
> > > --- a/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.h
> > > +++ b/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.h
> > > @@ -32,7 +32,7 @@
> > >   	container_of(pool, struct dcn315_resource_pool, base)
> > >   extern struct _vcs_dpi_ip_params_st dcn3_15_ip;
> > > -extern struct _vcs_dpi_ip_params_st dcn3_15_soc;
> > > +extern struct _vcs_dpi_soc_bounding_box_st dcn3_15_soc;
> > >   struct dcn315_resource_pool {
> > >   	struct resource_pool base;
> > > diff --git a/drivers/gpu/drm/amd/display/dc/dcn316/dcn316_resource.h b/drivers/gpu/drm/amd/display/dc/dcn316/dcn316_resource.h
> > > index 0dc5a6c13ae7..d2234aac5449 100644
> > > --- a/drivers/gpu/drm/amd/display/dc/dcn316/dcn316_resource.h
> > > +++ b/drivers/gpu/drm/amd/display/dc/dcn316/dcn316_resource.h
> > > @@ -32,7 +32,7 @@
> > >   	container_of(pool, struct dcn316_resource_pool, base)
> > >   extern struct _vcs_dpi_ip_params_st dcn3_16_ip;
> > > -extern struct _vcs_dpi_ip_params_st dcn3_16_soc;
> > > +extern struct _vcs_dpi_soc_bounding_box_st dcn3_16_soc;
> > >   struct dcn316_resource_pool {
> > >   	struct resource_pool base;

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