On Thu, Aug 01, 2024 at 01:06:37PM +0100, Mark Brown wrote: > @@ -2870,6 +2872,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = { > .matches = has_nv1, > ARM64_CPUID_FIELDS_NEG(ID_AA64MMFR4_EL1, E2H0, NI_NV1) > }, > + { > + .desc = "Guarded Control Stack (GCS)", > + .capability = ARM64_HAS_GCS, > + .type = ARM64_CPUCAP_SYSTEM_FEATURE, Given that it's for user space only, system feature makes sense. Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>