Re: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits

Kirill A. Shutemov
2025-06-20T17:31:29Z

On Fri, Jun 20, 2025 at 08:36:30AM -0700, Xin Li wrote:
> On 6/20/2025 6:53 AM, Kirill A. Shutemov wrote:
> > diff --git a/arch/x86/Kconfig.cpufeatures b/arch/x86/Kconfig.cpufeatures
> > index 250c10627ab3..9574c198fc08 100644
> > --- a/arch/x86/Kconfig.cpufeatures
> > +++ b/arch/x86/Kconfig.cpufeatures
> > @@ -124,6 +124,10 @@ config X86_DISABLED_FEATURE_PCID
> > def_bool y
> > depends on !X86_64
> > +config X86_DISABLED_FEATURE_LASS
> > + def_bool y
> > + depends on !X86_64
> > +
> > config X86_DISABLED_FEATURE_PKU
> > def_bool y
> > depends on !X86_INTEL_MEMORY_PROTECTION_KEYS
>
> You don't need to add X86_DISABLED_FEATURE_LASS, because the LASS code
> is NOT optional at build time, i.e., you now don't have CONFIG_X86_LASS.

Hmm. But it is optional. It depends on CONFIG_X86_64. I don't think we
want it to be advertised on 32-bit kernels.

--
Kiryl Shutsemau / Kirill A. Shutemov