Re: linux-next-20251029 - build error in amdgpu

["Timur Kristóf" <timur.kristof@gmail.com>]

On Wed, 2025-11-05 at 19:24 -0800, Amit Dhingra wrote:
> On Thu, Nov 06, 2025 at 03:40:52AM +0100, Timur Kristóf wrote:
> > On Wed, 2025-11-05 at 18:34 -0800, Amit Dhingra wrote:
> > > 
> > > > 
> > > > What do I need to do to trigger the warning?
> > > > 
> > > I have the same problem.
> > > 
> > > linux-next on Arch Linux
> > > GCC : 15.2.1 20250813
> > > 
> > > 
> > > Steps to reproduce the error
> > > - make mrproper
> > > - make allmodconfig
> > > - make drivers/gpu/drm/amd/amdgpu/
> > > 
> > > Turns out its due to randconfig, See [1]
> > > 
> > > Setting RANDSTRUCT_NONE=y seems to stop the error.
> > 
> > Can you please try and see if this fixes the warning?
> > https://pastebin.com/raw/b8j3UABj
> 
> The patch above defining all fields seems to fix the error.
> 
> > 
> > Alternatively, if anyone has other recommendations on how to fix
> > it,
> > I'm also open to suggestions.
> > 
> 
> What seemed to also work for me is to defining the struct as below
> without an initialization.
> 
> static const struct stream_encoder_funcs dce110_an_str_enc_funcs;
> 
> Its static so should be initialized zeroed out. objdump shows correct
> size
> allocation.
> 
> objdump -x dce_stream_encoder.o
> 
>   0000000000000b60 l     O .rodata	0000000000000130
> dce110_str_enc_funcs
>   0000000000000a00 l     O .rodata	0000000000000130
> dce110_an_str_enc_funcs
> 

Thanks! This looks even cleaner.

I will submit a patch to fix the warning next week.
Can I add your name and email to the Suggested-by tag?

Thanks,
Timur



> 
> > Thanks,
> > Timur
> > 
> > 
> > > > 
> > > > Valdis Klētnieks <valdis.kletnieks@vt.edu> ezt írta (időpont:
> > > > 2025.
> > > > nov.
> > > > 2., Vas 1:59):
> > > > 
> > > > > On Thu, 30 Oct 2025 19:05:30 +0100, Timur Kristóf said:
> > > > > 
> > > > > > Can you say how to reproduce that?
> > > > > > I use the same version of GCC but it hasn't given me any
> > > > > > warning or
> > > > > > error for that patch.
> > > > > 
> > > > > Upon further testing,
> > > > > 
> > > > > [/usr/src/linux-next] make
> > > > > 
> > > > > is sufficient on my system. Turns out that it errors out even
> > > > > without W=1.
> > > > > My
> > > > > next guess was that it had to do with -Werror, which would
> > > > > cause
> > > > > warnings
> > > > > to
> > > > > be treated as errors, but my .config has
> > > > > 
> > > > > # CONFIG_WERROR is not set
> > > > > # CONFIG_DRM_WERROR is not set
> > > > > # CONFIG_DRM_AMDGPU_WERROR is not set
> > > > > 
> > > > > Do you perhaps have patches in your tree that aren't in next-
> > > > > 20251029?
> > > > > 
> > > > > I wonder if Fedora's build of gcc 15.2.1 is different somehow
> > > > > from the
> > > > > build you're using....
> > > > > 
> > > > > 
> > > > > 
> > > > >