# Re: \[PATCH v15 03/11\] riscv/Kconfig: make direct map manipulation options depend on MMU

- From: Palmer Dabbelt \<palmer@dabbelt.com\>
- Date: 2021-01-23 04:13:37 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/01/198249
- Thread: https://ratatoskr.run/linux-api/2021/01/197758/t.md

```text
On Wed, 20 Jan 2021 10:06:04 PST (-0800), rppt@kernel.org wrote:
> From: Mike Rapoport <redacted>
>
> ARCH_HAS_SET_DIRECT_MAP and ARCH_HAS_SET_MEMORY configuration options have
> no meaning when CONFIG_MMU is disabled and there is no point to enable them
> for the nommu case.
>
> Add an explicit dependency on MMU for these options.
>
> Signed-off-by: Mike Rapoport <redacted>
> Reported-by: kernel test robot <redacted>
> ---
>  arch/riscv/Kconfig | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index d82303dcc6b6..d35ce19ab1fa 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -25,8 +25,8 @@ config RISCV
>  	select ARCH_HAS_KCOV
>  	select ARCH_HAS_MMIOWB
>  	select ARCH_HAS_PTE_SPECIAL
> -	select ARCH_HAS_SET_DIRECT_MAP
> -	select ARCH_HAS_SET_MEMORY
> +	select ARCH_HAS_SET_DIRECT_MAP if MMU
> +	select ARCH_HAS_SET_MEMORY if MMU
>  	select ARCH_HAS_STRICT_KERNEL_RWX if MMU
>  	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
>  	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT

Reviewed-by: Palmer Dabbelt <redacted>
Acked-by: Palmer Dabbelt <redacted>

LMK if you want this to go in via the RISC-V tree, otherwise I'm going to
assume it's going in along with the rest of these.  FWIW I see these in other
architectures without the MMU guard.

Thanks!

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```