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

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Message-ID: <d3055288-c640-4df3-978e-abb97b1610e7@zytor.com>
Date: Fri, 20 Jun 2025 08:36:30 -0700
From: Xin Li <xin@...or.com>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
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        Josh Poimboeuf <jpoimboe@...nel.org>,
        Xiongwei Song <xiongwei.song@...driver.com>,
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Cc: Jonathan Corbet <corbet@....net>, Sohil Mehta <sohil.mehta@...el.com>,
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Subject: Re: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits

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.

It was removed per the change log:

Changes from v1[1]:
- Remove CONFIG_X86_LASS

Thanks!
     Xin