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Subject[tip: x86/boot] x86/boot/compressed/64: Use LEA to initialize boot stack pointer
The following commit has been merged into the x86/boot branch of tip:

Commit-ID: 48bfdb9deffdc6b683feb25e15f4f26aac503501
Gitweb: https://git.kernel.org/tip/48bfdb9deffdc6b683feb25e15f4f26aac503501
Author: Arvind Sankar <nivedita@alum.mit.edu>
AuthorDate: Tue, 07 Jan 2020 14:44:35 -05:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Wed, 12 Feb 2020 11:11:06 +01:00

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
---
arch/x86/boot/compressed/head_64.S | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

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
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