Re: [REGRESSION] next/master: (build) stack frame size (2088) exceeds limit (2048) in 'dml31_ModeSupport...

On 6/5/26 06:23, Randy Dunlap wrote:
> [adding amd-gfx]

[+Nathan -- I'm also wondering if we should CC the amdgpu maintainers,
but lets wait with that for a moment]

Nathan afaics saw this problem a few weeks ago already and filed and
issue for tracking: https://github.com/ClangBuiltLinux/linux/issues/2161

To quote from there: ""After LLVM commit 8ac9461e48e0 ("[SLP] Reject
2-element vectorization when vector inst count exceeds scalar",
2026-04-11), I am seeing two new -Wframe-larger-than instances from
drivers/gpu/drm/amd/display […]""

Side note: I wonder if that LLVM commit somehow made it to the KernelCI
env, or if something in the amdgpu code in -next changed and made the
problem worse.

Ciao, Thorsten

> On 6/4/26 10:59 AM, KernelCI bot wrote:
>> Hello,
>>
>> New build issue found on next/master:
>>
>> ---
>>  stack frame size (2088) exceeds limit (2048) in 'dml31_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than] in drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.o (drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.c) [logspec:kbuild,kbuild.compiler.error]
>> ---
>>
>> - dashboard: https://d.kernelci.org/i/maestro:96417cd30041ab8f3153128d0120c6cd70782d99
>> - giturl: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>> - commit HEAD:  b99ae45861eccff1e1d8c7b05a13650be805d437
>> - tags: next-20260604
>>
>> Please include the KernelCI tag when submitting a fix:
>>
>> Reported-by: kernelci.org bot <[email protected]>
>>
>>
>> Log excerpt:
>> =====================================================
>> /tmp/kci/linux/drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.c:3872:6: error: stack frame size (2088) exceeds limit (2048) in 'dml31_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
>>  3872 | void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
>>       |      ^
>> 1 error generated.
>>
>> =====================================================
>>
>>
>> # Builds where the incident occurred:
>>
>> ## x86_64_defconfig+kselftest+x86-board on (x86_64):
>> - compiler: clang-21
>> - config: None
>> - dashboard: https://d.kernelci.org/build/maestro:6a21abf22cc72b6e94bf3c60
>>
>>
>> #kernelci issue maestro:96417cd30041ab8f3153128d0120c6cd70782d99
>>
>> --
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