linux-kernel - Re: [PATCH 04/20] x86/cpu: Use named asm operands in clflushopt()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAHk-=wjBjq6u+r9KGTHQ5nOA1L2TDhz0JPL_+eE07un9y9Qm-w@mail.gmail.com>
Date: Fri, 14 Mar 2025 13:46:00 -1000
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, 
	Peter Zijlstra <peterz@...radead.org>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, 
	Uros Bizjak <ubizjak@...il.com>, Andrew Cooper <andrew.cooper3@...rix.com>, 
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 04/20] x86/cpu: Use named asm operands in clflushopt()

On Fri, 14 Mar 2025 at 11:42, Josh Poimboeuf <jpoimboe@...nel.org> wrote:
>
> +       alternative_io(".byte 0x3e; clflush %[val]",
> +                      ".byte 0x66; clflush %[val]", X86_FEATURE_CLFLUSHOPT,
> +                      [val] "+m" (*(volatile char __force *)__p));

Hmm. I think we could just use 'clflushopt', it looks like it exists
in binutils-2.25, which is our minimal version requirement.

But maybe that's a separate cleanup.

             Linus