Re: mainline build failure (new) for x86_64 allmodconfig with clang

[Nathan Chancellor]

Hi Sudip,

On Sat, Sep 17, 2022 at 11:55:05AM +0100, Sudip Mukherjee (Codethink) wrote:
> Hi All,
> 
> The latest mainline kernel branch fails to build for x86_64 allmodconfig
> with clang. The errors are:
> 
> drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn314/display_mode_vba_314.c:4020:6: error: stack frame size (2184) exceeds limit (2048) in 'dml314_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
> void dml314_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
>      ^
> 1 error generated.
> 
> 
> Note: This is a new error seen on top on a335366bad13 ("Merge tag 'gpio-fixes-for-v6.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux").
> Previous reported clang build error is now fixed, thanks to Nathan.
> 
> And, it appears Nathan has already sent a fix for this:
> https://github.com/intel-lab-lkp/linux/commit/4ecc45d7585ae2e05d622879ad97e13a7d8c595b
> https://github.com/intel-lab-lkp/linux/commit/819976a950b497d7f10cd9a198a94c26a9005b30

I did not realize this was a mainline issue too :( it seems that
commit af2f2a256e04 ("drm/amd/display: Enable dlg and vba compilation
for dcn314") is needed to see this and it was only in -next for three
releases (20220914 to 20220916), which I missed checking as closely as I
normally do due to Plumbers wrapping up and traveling.

The series is on the mailing lists at
https://lore.kernel.org/20220916210658.3412450-1-nathan@xxxxxxxxxx/,
which is basically just 's/31/314/g' on the dml31 fixes because the code
is identical. Hopefully those two patches can be picked up in the same
manner as the other ones so that x86_64 allmodconfig does not ship
broken in 6.0 and thank you to the AMD folks for moving on those
already!

Cheers,
Nathan