linux-kernel - Re: [PATCH] drm/amd/display: Increase frame-larger-than warning limit

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Date: Mon, 3 Jun 2024 15:29:48 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Palmer Dabbelt <palmer@...osinc.com>
Cc: alexander.deucher@....com, harry.wentland@....com, sunpeng.li@....com,
	Rodrigo.Siqueira@....com, christian.koenig@....com,
	Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
	Qingqing.Zhuo@....com, hamza.mahfooz@....com, chenhuacai@...nel.org,
	amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: Increase frame-larger-than warning limit

Hi Palmer,

On Thu, May 30, 2024 at 07:57:42AM -0700, Palmer Dabbelt wrote:
> From: Palmer Dabbelt <palmer@...osinc.com>
> 
> I get a handful of build errors along the lines of
> 
>     linux/drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c:58:13: error: stack frame size (2352) exceeds limit (2048) in 'DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation' [-Werror,-Wframe-larger-than]
>     static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation(
>                 ^
>     linux/drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c:1724:6: error: stack frame size (2096) exceeds limit (2048) in 'dml32_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
>     void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
>          ^

Judging from the message, this is clang/LLVM? What version? I assume
this showed up in 6.10-rc1 because of commit 77acc6b55ae4 ("riscv: add
support for kernel-mode FPU"), which allows this driver to be built for
RISC-V. Is this allmodconfig or some other configuration?

> as of 6.10-rc1.
> 
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
> ---
>  drivers/gpu/drm/amd/display/dc/dml/Makefile | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> index c4a5efd2dda5..b2bd72e63734 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> @@ -62,9 +62,9 @@ endif
>  
>  ifneq ($(CONFIG_FRAME_WARN),0)
>  ifeq ($(filter y,$(CONFIG_KASAN)$(CONFIG_KCSAN)),y)
> -frame_warn_flag := -Wframe-larger-than=3072
> +frame_warn_flag := -Wframe-larger-than=4096
>  else
> -frame_warn_flag := -Wframe-larger-than=2048
> +frame_warn_flag := -Wframe-larger-than=3072
>  endif
>  endif
>  
> -- 
> 2.45.1
>