Re: [PATCH RFC RFT v2 1/5] mm: Introduce ARCH_HAS_USER_SHADOW_STACK

On Tue, 2023-11-14 at 20:05 +0000, Mark Brown wrote:

+config ARCH_HAS_USER_SHADOW_STACK +       bool +       help +         The architecture has hardware support for userspace shadow call +          stacks (eg, x86 CET, arm64 GCS, RISC-V Zisslpcfi).

I feel like normally a patch like this should come with the second feature that gets enabled. (i.e. arm or riscv). Especially since the comment lists currently unsupported features. I think something like this got nixed by an x86 maintainer earlier, but that was before these other features were getting pushed.

I don't have a strong objection to having it ahead of the other features though and it is nice to remove X86 defines out of core code.