From: Arvind Sankar <nivedita@alum.mit.edu>
Date: Tue, 7 Jan 2020 19:44:35 +0000 (-0500)
Subject: x86/boot/compressed/64: Use LEA to initialize boot stack pointer
X-Git-Tag: v5.15~4219^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=48bfdb9deffdc6b683feb25e15f4f26aac503501;p=platform%2Fkernel%2Flinux-starfive.git

x86/boot/compressed/64: Use LEA to initialize boot stack pointer

It's shorter, and it's what is used in every other place, so make it
consistent.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200107194436.2166846-2-nivedita@alum.mit.edu
---

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 1f1f6c8..d1220de 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -81,9 +81,7 @@ SYM_FUNC_START(startup_32)
 	subl	$1b, %ebp
 
 /* setup a stack and make sure cpu supports long mode. */
-	movl	$boot_stack_end, %eax
-	addl	%ebp, %eax
-	movl	%eax, %esp
+	leal	boot_stack_end(%ebp), %esp
 
 	call	verify_cpu
 	testl	%eax, %eax