[RFC PATCH] powerpc: Add check to select PPC_RADIX_BROADCAST_TLBIE

[Ritesh Harjani (IBM)]

Madhavan Srinivasan <maddy at linux.ibm.com> writes:

> Commit 3d45a3d0d2e6 ("powerpc: Define config option for processors with broadcast TLBIE")

We may need to add above to Fixes tag as well, no?

> added a config option PPC_RADIX_BROADCAST_TLBIE to support processors with
> broadcast TLBIE. Since this option is relevant only for RADIX_MMU, add
> a check as a dependency to enable PPC_RADIX_BROADCAST_TLBIE in both
> powernv and pseries configs. This fixes the unmet config dependency
> warning reported
>
>    WARNING: unmet direct dependencies detected for PPC_RADIX_BROADCAST_TLBIE
>      Depends on [n]: PPC_RADIX_MMU [=n]
>      Selected by [y]:
>      - PPC_PSERIES [=y] && PPC64 [=y] && PPC_BOOK3S [=y]
>
> Reported-by: kernel test robot <lkp at intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202504051857.jRqxM60c-lkp@intel.com/
> Signed-off-by: Madhavan Srinivasan <maddy at linux.ibm.com>

It's a bit strange that even though PPC_RADIX_BROADCAST_TLBIE adds
PPC_RADIX_MMU as a dependency where is it defined, we still have to add
an extra check for the same dependency to enable this for any platform.

The config generated by the 0day in the shared link, indeed had an unmet
dependency. i.e.

CONFIG_PPC_64S_HASH_MMU=y
# CONFIG_PPC_RADIX_MMU is not set
CONFIG_PPC_RADIX_BROADCAST_TLBIE=y


So, the fix look good to me. Please feel free to take:
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list at gmail.com>


> ---
>  arch/powerpc/platforms/powernv/Kconfig | 2 +-
>  arch/powerpc/platforms/pseries/Kconfig | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/Kconfig b/arch/powerpc/platforms/powernv/Kconfig
> index 3fbe0295ce14..95d7ba73d43d 100644
> --- a/arch/powerpc/platforms/powernv/Kconfig
> +++ b/arch/powerpc/platforms/powernv/Kconfig
> @@ -17,7 +17,7 @@ config PPC_POWERNV
>  	select MMU_NOTIFIER
>  	select FORCE_SMP
>  	select ARCH_SUPPORTS_PER_VMA_LOCK
> -	select PPC_RADIX_BROADCAST_TLBIE
> +	select PPC_RADIX_BROADCAST_TLBIE if PPC_RADIX_MMU
>  	default y
>  
>  config OPAL_PRD
> diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
> index a934c2a262f6..fa3c2fff082a 100644
> --- a/arch/powerpc/platforms/pseries/Kconfig
> +++ b/arch/powerpc/platforms/pseries/Kconfig
> @@ -23,7 +23,7 @@ config PPC_PSERIES
>  	select FORCE_SMP
>  	select SWIOTLB
>  	select ARCH_SUPPORTS_PER_VMA_LOCK
> -	select PPC_RADIX_BROADCAST_TLBIE
> +	select PPC_RADIX_BROADCAST_TLBIE if PPC_RADIX_MMU
>  	default y
>  
>  config PARAVIRT
> -- 
> 2.48.1