linux-kernel - Re: drivers/gpu/drm/amd/amdgpu/../display/dc/dml2/display_mode_core.c:6193:12: warning: stack frame size (3368) exceeds limit (2048) in 'dml_core_mode

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Date: Tue, 6 Feb 2024 14:20:17 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Qingqing Zhuo <Qingqing.Zhuo@....com>
CC: kernel test robot <lkp@...el.com>, <oe-kbuild-all@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, Alex Deucher <alexander.deucher@....com>,
	Rodrigo Siqueira <Rodrigo.Siqueira@....com>, Roman Li <roman.li@....com>
Subject: Re:
 drivers/gpu/drm/amd/amdgpu/../display/dc/dml2/display_mode_core.c:6193:12:
 warning: stack frame size (3368) exceeds limit (2048) in
 'dml_core_mode_support'

From: Kernel Test Robot <lkp@...el.com>
Date: Mon, 20 Nov 2023 10:01:21 +0800

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   037266a5f7239ead1530266f7d7af153d2a867fa
> commit: 7966f319c66d9468623c6a6a017ecbc0dd79be75 drm/amd/display: Introduce DML2
> date:   6 weeks ago
> config: x86_64-randconfig-121-20231119 (https://download.01.org/0day-ci/archive/20231120/202311200955.pmjdQEM1-lkp@intel.com/config)
> compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231120/202311200955.pmjdQEM1-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202311200955.pmjdQEM1-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>    warning: unknown warning option '-Wstringop-truncation'; did you mean '-Wstring-concatenation'? [-Wunknown-warning-option]
>    warning: unknown warning option '-Wpacked-not-aligned'; did you mean '-Wpacked-non-pod'? [-Wunknown-warning-option]
>>> drivers/gpu/drm/amd/amdgpu/../display/dc/dml2/display_mode_core.c:6193:12: warning: stack frame size (3368) exceeds limit (2048) in 'dml_core_mode_support' [-Wframe-larger-than]
>    dml_bool_t dml_core_mode_support(struct display_mode_lib_st *mode_lib)

Ping? This still happens on the latest RC and linux-next on LLVM 19 at
least (-O2) and breaks CONFIG_WERROR builds.

>               ^
>    2183/3368 (64.82%) spills, 1185/3368 (35.18%) variables
>    drivers/gpu/drm/amd/amdgpu/../display/dc/dml2/display_mode_core.c:8241:6: warning: stack frame size (2232) exceeds limit (2048) in 'dml_core_mode_programming' [-Wframe-larger-than]
>    void dml_core_mode_programming(struct display_mode_lib_st *mode_lib, const struct dml_clk_cfg_st *clk_cfg)
>         ^
>    1441/2232 (64.56%) spills, 791/2232 (35.44%) variables
>    4 warnings generated.
Thanks,
Olek