linux-kernel - [tip:x86/asm] x86/asm/boot/64: Use __BOOT

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Message-ID: <tip-40e4f2d177f748a83e7639554ea7d11568a9fa1f@git.kernel.org>
Date:	Thu, 2 Apr 2015 05:33:19 -0700
From:	tip-bot for Denys Vlasenko <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	bp@...e.de, luto@...capital.net, tglx@...utronix.de, bp@...en8.de,
	wad@...omium.org, mingo@...nel.org, hpa@...or.com,
	torvalds@...ux-foundation.org, fweisbec@...il.com,
	rostedt@...dmis.org, keescook@...omium.org,
	linux-kernel@...r.kernel.org, oleg@...hat.com, ast@...mgrid.com,
	dvlasenk@...hat.com
Subject: [tip:x86/asm] x86/asm/boot/64:
  Use __BOOT_TSS instead of literal $0x20

Commit-ID:  40e4f2d177f748a83e7639554ea7d11568a9fa1f
Gitweb:     http://git.kernel.org/tip/40e4f2d177f748a83e7639554ea7d11568a9fa1f
Author:     Denys Vlasenko <dvlasenk@...hat.com>
AuthorDate: Wed, 1 Apr 2015 16:50:58 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 2 Apr 2015 12:00:20 +0200

x86/asm/boot/64: Use __BOOT_TSS instead of literal $0x20

__BOOT_TSS = (GDT_ENTRY_BOOT_TSS * 8)
GDT_ENTRY_BOOT_TSS = (GDT_ENTRY_BOOT_CS + 2)
GDT_ENTRY_BOOT_CS = 2

(2 + 2) * 8 = 4 * 8 = 32 = 0x20

No code changes.

Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
Reviewed-by: Steven Rostedt <rostedt@...dmis.org>
Acked-by: Borislav Petkov <bp@...e.de>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Will Drewry <wad@...omium.org>
Link: http://lkml.kernel.org/r/1427899858-7165-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/boot/compressed/head_64.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 90c1521..b0c0d16 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -165,7 +165,7 @@ ENTRY(startup_32)
 	/* After gdt is loaded */
 	xorl	%eax, %eax
 	lldt	%ax
-	movl    $0x20, %eax
+	movl    $__BOOT_TSS, %eax
 	ltr	%ax
 
 	/*
--
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