[PATCH v6 07/22] powerpc/book3s64/kuap: Rename MMU_FTR_RADIX_KUAP to MMU_FTR_KUAP

[Michael Ellerman]

"Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> writes:
> diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
> index 255a1837e9f7..f5c7a17c198a 100644
> --- a/arch/powerpc/include/asm/mmu.h
> +++ b/arch/powerpc/include/asm/mmu.h
> @@ -28,6 +28,11 @@
>   * Individual features below.
>   */
>  
> +/*
> + * Supports KUAP (key 0 controlling userspace addresses) on radix
> + */

That comment needs updating.

I think this feature now means we have either key 0 controlling uaccess
on radix OR we're using the AMR to manually implement KUAP.

> +#define MMU_FTR_KUAP			ASM_CONST(0x00000200)

I agree with Christophe that this name is now too generic.

With that name one would expect it to be enabled on the 32-bit CPUs that
implement KUAP.

Maybe MMU_FTR_BOOK3S_KUAP ?


If in future the other MMUs want an MMU feature for KUAP then we could
rename it to MMU_FTR_KUAP, but we'd need to be careful with ifdefs to
make sure it guards the right things.

cheers