2019-01-23 10:05:16

by Cao jin

[permalink] [raw]
Subject: [PATCH] x86/boot: save several bytes in decompressor

gdt64 represents the content of GDTR under x86-64, which actually needs
10 bytes only, ".long" & ".word" is superfluous.

Signed-off-by: Cao jin <[email protected]>
---
arch/x86/boot/compressed/head_64.S | 2 --
1 file changed, 2 deletions(-)

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 58f6a467f1fa..541358454f10 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -642,8 +642,6 @@ no_longmode:
.data
gdt64:
.word gdt_end - gdt
- .long 0
- .word 0
.quad 0
gdt:
.word gdt_end - gdt
--
2.17.0





2019-01-23 10:07:51

by Kirill A. Shutemov

[permalink] [raw]
Subject: Re: [PATCH] x86/boot: save several bytes in decompressor

On Wed, Jan 23, 2019 at 06:00:14PM +0800, Cao jin wrote:
> gdt64 represents the content of GDTR under x86-64, which actually needs
> 10 bytes only, ".long" & ".word" is superfluous.
>
> Signed-off-by: Cao jin <[email protected]>

Acked-by: Kirill A. Shutemov <[email protected]>

--
Kirill A. Shutemov

Subject: [tip:x86/cleanups] x86/boot: Save several bytes in decompressor

Commit-ID: 0a278662f53159354a0391a17741a20db736256a
Gitweb: https://git.kernel.org/tip/0a278662f53159354a0391a17741a20db736256a
Author: Cao jin <[email protected]>
AuthorDate: Wed, 23 Jan 2019 18:00:14 +0800
Committer: Thomas Gleixner <[email protected]>
CommitDate: Tue, 29 Jan 2019 22:09:12 +0100

x86/boot: Save several bytes in decompressor

gdt64 represents the content of GDTR under x86-64, which actually needs
10 bytes only, ".long" & ".word" is superfluous.

Signed-off-by: Cao jin <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

---
arch/x86/boot/compressed/head_64.S | 2 --
1 file changed, 2 deletions(-)

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 64037895b085..b27b338d2f6d 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -645,8 +645,6 @@ no_longmode:
.data
gdt64:
.word gdt_end - gdt
- .long 0
- .word 0
.quad 0
gdt:
.word gdt_end - gdt