Re: [PATCH v3 5/8] arm64: Select GENERIC_CPU_CACHE_MAINTENANCE and ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION

[Catalin Marinas <catalin.marinas@arm.com>]

On Wed, Aug 20, 2025 at 11:29:47AM +0100, Jonathan Cameron wrote:
> Ensure the hooks that the generic cache maintenance framework uses are
> available on ARM64 by selecting ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION.
> 
> The generic CPU cache maintenance framework provides a way to register
> drivers for devices implementing the underlying support for
> cpu_cache_has_invalidate_memregion().
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
>  arch/arm64/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index e9bbfacc35a6..15bf429b3f59 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -21,6 +21,7 @@ config ARM64
>  	select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
>  	select ARCH_HAS_CACHE_LINE_SIZE
>  	select ARCH_HAS_CC_PLATFORM
> +	select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION

We could drop this if GENERIC_CPU_CACHE_MAINTENANCE selects it.

>  	select ARCH_HAS_CURRENT_STACK_POINTER
>  	select ARCH_HAS_DEBUG_VIRTUAL
>  	select ARCH_HAS_DEBUG_VM_PGTABLE
> @@ -146,6 +147,7 @@ config ARM64
>  	select GENERIC_ARCH_TOPOLOGY
>  	select GENERIC_CLOCKEVENTS_BROADCAST
>  	select GENERIC_CPU_AUTOPROBE
> +	select GENERIC_CPU_CACHE_MAINTENANCE

Either way:

Acked-by: Catalin Marinas <catalin.marinas@arm.com>