Re: [PATCH] drm/amd/pm: Avoid more large frame warnings

["Lazar, Lijo" <lijo.lazar@amd.com>]

On 6/11/2025 2:51 AM, Palmer Dabbelt wrote:
> From: Palmer Dabbelt <palmer@dabbelt.com>
> 
> 9KiB frames seem pretty big, but without this I'm getting some warnings
> as of 6.16-rc1
> 
>       CC [M]  drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_6_ppt.o
>     drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_6_ppt.c: In function 'smu_v13_0_6_get_gpu_metrics':
>     drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_6_ppt.c:2885:1: error: the frame size of 8304 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>      2885 | }
>           | ^
>     cc1: all warnings being treated as errors
>

Could you also provide your build environment details?

With below in Makefile + gcc 11.4.0, stack frame size is 168 bytes.

ccflags-y += -fstack-usage

smu_v13_0_6_ppt.c:2667:16:smu_v13_0_6_get_gpu_metrics   168     static

Thanks,
Lijo

> Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
> ---
>  drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile b/drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile
> index 51f1fa9789ab..9824b7f4827f 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile
> +++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile
> @@ -23,9 +23,19 @@
>  # Makefile for the 'smu manager' sub-component of powerplay.
>  # It provides the smu management services for the driver.
>  
> +ifneq ($(CONFIG_FRAME_WARN),0)
> +    frame_warn_limit := 9216
> +    ifeq ($(call test-lt, $(CONFIG_FRAME_WARN), $(frame_warn_limit)),y)
> +        frame_warn_flag := -Wframe-larger-than=$(frame_warn_limit)
> +    endif
> +endif
> +
>  SMU13_MGR = smu_v13_0.o aldebaran_ppt.o yellow_carp_ppt.o smu_v13_0_0_ppt.o smu_v13_0_4_ppt.o \
>  	    smu_v13_0_5_ppt.o smu_v13_0_7_ppt.o smu_v13_0_6_ppt.o smu_v13_0_12_ppt.o
>  
>  AMD_SWSMU_SMU13MGR = $(addprefix $(AMD_SWSMU_PATH)/smu13/,$(SMU13_MGR))
>  
>  AMD_POWERPLAY_FILES += $(AMD_SWSMU_SMU13MGR)
> +
> +CFLAGS_$(AMD_SWSMU_PATH)/smu13/smu_v13_0_12_ppt.o := $(frame_warn_flag)
> +CFLAGS_$(AMD_SWSMU_PATH)/smu13/smu_v13_0_6_ppt.o := $(frame_warn_flag)