linux-kernel - [tip:x86/urgent] x86, doc: Fix incorrect comment about 64-bit code segment descriptors

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Message-ID: <tip-1256276c98dbcfb009ac8e0687df9a1e291fd149@git.kernel.org>
Date:	Mon, 25 Feb 2013 14:15:18 -0800
From:	tip-bot for Konrad Rzeszutek Wilk <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	konrad.wilk@...cle.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/urgent] x86, doc:
  Fix incorrect comment about 64-bit code segment descriptors

Commit-ID:  1256276c98dbcfb009ac8e0687df9a1e291fd149
Gitweb:     http://git.kernel.org/tip/1256276c98dbcfb009ac8e0687df9a1e291fd149
Author:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
AuthorDate: Mon, 25 Feb 2013 15:54:10 -0500
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Mon, 25 Feb 2013 13:42:37 -0800

x86, doc: Fix incorrect comment about 64-bit code segment descriptors

The AMD64 Architecture Programmer's Manual Volume 2, on page
89 mentions: "If the processor is running in 64-bit mode (L=1),
the only valid setting of the D bit is 0." This matches
with what the code does.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Link: http://lkml.kernel.org/r/1361825650-14031-4-git-send-email-konrad.wilk@oracle.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/kernel/head_64.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 980053c..37f5304 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -49,7 +49,7 @@ L3_START_KERNEL = pud_index(__START_KERNEL_map)
 startup_64:
 
 	/*
-	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 1,
+	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,
 	 * and someone has loaded an identity mapped page table
 	 * for us.  These identity mapped page tables map all of the
 	 * kernel pages and possibly all of memory.
@@ -146,7 +146,7 @@ ident_complete:
 	jmp secondary_startup_64
 ENTRY(secondary_startup_64)
 	/*
-	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 1,
+	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,
 	 * and someone has loaded a mapped page table.
 	 *
 	 * %esi holds a physical pointer to real_mode_data.
--
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