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From: Kanna Scarlet <knscarlet@gnuweeb.org>
To: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org
Cc: Kanna Scarlet <knscarlet@gnuweeb.org>,
	Ard Biesheuvel <ardb@kernel.org>,
	Bill Metzenthen <billm@melbpc.org.au>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Joerg Roedel <jroedel@suse.de>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Michael Roth <michael.roth@amd.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Sean Christopherson <seanjc@google.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ammar Faizi <ammarfaizi2@gnuweeb.org>,
	GNU/Weeb Mailing List <gwml@vger.gnuweeb.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [PATCH 0/1] x86 change mov 0, %reg to xor %reg, %reg
Date: Thu,  4 Aug 2022 15:26:54 +0000
Message-Id: <20220804152656.8840-1-knscarlet@gnuweeb.org>
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Hello Linux x86 maintainers,

I'm an informatic student 19 y.o. I am still studying Linux kernel open
source in GNU/Weeb community. I want to be a linux kerne dev in the
future. This is my first time sending a patch to Linux Kernel, I am
still learning the community. I may make a mistake in this email, please
correct me if i am wrong

I want to improve x86-64 assembly code with this patch. This patch
changes mov $0, %reg with xor %reg, %reg because xor %reg, %reg is
smaller so it is good to save space

asm:
ba 00 00 00 00  mov   $0x0,%edx
31 d2           xor   %edx,%edx


Regards,

Signed-off-by: Kanna Scarlet <knscarlet@gnuweeb.org>
---

Kanna Scarlet (1):
  x86: Change mov $0, %reg with xor %reg, %reg

 arch/x86/boot/compressed/head_64.S     | 2 +-
 arch/x86/boot/compressed/mem_encrypt.S | 2 +-
 arch/x86/kernel/ftrace_32.S            | 4 ++--
 arch/x86/kernel/head_64.S              | 2 +-
 arch/x86/math-emu/div_Xsig.S           | 2 +-
 arch/x86/math-emu/reg_u_sub.S          | 2 +-
 6 files changed, 7 insertions(+), 7 deletions(-)


base-commit: ff89dd08c0f0a3fd330c9ef9d775e880f82c291e
-- 
Kanna Scarlet