Re: [PATCH] drm: Select DRM_KMS_HELPER from DRM_DEBUG_DP_MST_TOPOLOGY_REFS

[Thomas Zimmermann]

Am 04.03.25 um 20:12 schrieb Janne Grunau via B4 Relay:
> From: Janne Grunau <j@xxxxxxxxxx>
>
> Using "depends on" and "select" for the same Kconfig symbol is known to
> cause circular dependencies (cmp. "Kconfig recursive dependency
> limitations" in Documentation/kbuild/kconfig-language.rst.
> DRM drivers are selecting drm helpers so do the same for
> DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
> Fixes following circular dependency reported on x86 for the downstream
> Asahi Linux tree:
>
> error: recursive dependency detected!
>    symbol DRM_KMS_HELPER is selected by DRM_GEM_SHMEM_HELPER
>    symbol DRM_GEM_SHMEM_HELPER is selected by RUST_DRM_GEM_SHMEM_HELPER
>    symbol RUST_DRM_GEM_SHMEM_HELPER is selected by DRM_ASAHI
>    symbol DRM_ASAHI depends on RUST
>    symbol RUST depends on CALL_PADDING
>    symbol CALL_PADDING depends on OBJTOOL
>    symbol OBJTOOL is selected by STACK_VALIDATION
>    symbol STACK_VALIDATION depends on UNWINDER_FRAME_POINTER
>    symbol UNWINDER_FRAME_POINTER is part of choice block at arch/x86/Kconfig.debug:224
>    symbol <choice> unknown is visible depending on UNWINDER_GUESS
>    symbol UNWINDER_GUESS prompt is visible depending on STACKDEPOT
>    symbol STACKDEPOT is selected by DRM_DEBUG_DP_MST_TOPOLOGY_REFS
>    symbol DRM_DEBUG_DP_MST_TOPOLOGY_REFS depends on DRM_KMS_HELPER
>
> Fixes: 12a280c72868 ("drm/dp_mst: Add topology ref history tracking for debugging")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Janne Grunau <j@xxxxxxxxxx>

Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

> ---
>   drivers/gpu/drm/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index fbef3f471bd0e5101699cf576542f7350bea3982..bd228dc77e99b4356b09de02d9001237eb2423e2 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -188,7 +188,7 @@ config DRM_DEBUG_DP_MST_TOPOLOGY_REFS
>           bool "Enable refcount backtrace history in the DP MST helpers"
>   	depends on STACKTRACE_SUPPORT
>           select STACKDEPOT
> -        depends on DRM_KMS_HELPER
> +        select DRM_KMS_HELPER
>           depends on DEBUG_KERNEL
>           depends on EXPERT
>           help
>
> ---
> base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b
> change-id: 20250304-drm_debug_dp_mst_topo_kconfig-a112904ba611
>
> Best regards,

--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)