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

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To: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Xiongwei Song <xiongwei.song@xxxxxxxxxxxxx>, Xin Li <xin3.li@xxxxxxxxx>, "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>, Brijesh Singh <brijesh.singh@xxxxxxx>, Michael Roth <michael.roth@xxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Alexey Kardashevskiy <aik@xxxxxxx>, Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Subject: Re: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits
From: Xin Li <xin@xxxxxxxxx>
Date: Fri, 20 Jun 2025 09:12:23 -0700
Cc: Jonathan Corbet <corbet@xxxxxxx>, Sohil Mehta <sohil.mehta@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>, Daniel Sneddon <daniel.sneddon@xxxxxxxxxxxxxxx>, Kai Huang <kai.huang@xxxxxxxxx>, Sandipan Das <sandipan.das@xxxxxxx>, Breno Leitao <leitao@xxxxxxxxxx>, Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Hou Tao <houtao1@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Vegard Nossum <vegard.nossum@xxxxxxxxxx>, Kees Cook <kees@xxxxxxxxxx>, Eric Biggers <ebiggers@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, "Masami Hiramatsu (Google)" <mhiramat@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Luis Chamberlain <mcgrof@xxxxxxxxxx>, Yuntao Wang <ytcoode@xxxxxxxxx>, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>, Christophe Leroy <christophe.leroy@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Changbin Du <changbin.du@xxxxxxxxxx>, Huang Shijie <shijie@xxxxxxxxxxxxxxxxxxxxxx>, Geert Uytterhoeven <geert+renesas@xxxxxxxxx>, Namhyung Kim <namhyung@xxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Yian Chen <yian.chen@xxxxxxxxx>
In-reply-to: <25600557-9cd5-406c-9acf-abc163afde2d@infradead.org>
References: <20250620135325.3300848-1-kirill.shutemov@linux.intel.com> <20250620135325.3300848-2-kirill.shutemov@linux.intel.com> <25600557-9cd5-406c-9acf-abc163afde2d@infradead.org>
User-agent: Mozilla Thunderbird

On 6/20/2025 9:02 AM, Randy Dunlap wrote:

+config X86_DISABLED_FEATURE_LASS
+	def_bool y
+	depends on !X86_64

Please explain why this is   !X86_64.


When NOT on X86_64, the LASS code should not be compiled.

But first of all, as I replied earlier, X86_DISABLED_FEATURE_LASS is
completely not needed.

Thanks!
    Xin

Follow-Ups:
- Re: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits
  - From: Randy Dunlap

References:
- [PATCHv6 00/16] x86: Enable Linear Address Space Separation support
  - From: Kirill A. Shutemov
- [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits
  - From: Kirill A. Shutemov
- Re: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits
  - From: Randy Dunlap

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