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Message-ID: <Yuzl7+qPtK1i2aSj@suse.de>
Date: Fri, 5 Aug 2022 11:42:07 +0200
From: Joerg Roedel <jroedel@...e.de>
To: David Laight <David.Laight@...lab.com>
Cc: 'Kanna Scarlet' <knscarlet@...weeb.org>,
Borislav Petkov <bp@...en8.de>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>,
"x86@...nel.org" <x86@...nel.org>,
Ard Biesheuvel <ardb@...nel.org>,
Bill Metzenthen <billm@...bpc.org.au>,
Brijesh Singh <brijesh.singh@....com>,
Josh Poimboeuf <jpoimboe@...nel.org>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Mark Rutland <mark.rutland@....com>,
Michael Roth <michael.roth@....com>,
Peter Zijlstra <peterz@...radead.org>,
Sean Christopherson <seanjc@...gle.com>,
Steven Rostedt <rostedt@...dmis.org>,
Ammar Faizi <ammarfaizi2@...weeb.org>,
GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] x86: Change mov $0, %reg with xor %reg, %reg
On Fri, Aug 05, 2022 at 09:26:02AM +0000, David Laight wrote:
> Use "xor %rax,%rax" instead of "xor %eax,%eax" to save
> the 'reg' prefix.
Also, some places explicitly use the mov variant to zero a register
without touching rflags. Please be careful to not change those.
Regards,
--
Jörg Rödel
jroedel@...e.de
SUSE Software Solutions Germany GmbH
Frankenstraße 146
90461 Nürnberg
Germany
(HRB 36809, AG Nürnberg)
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