linux-kernel - [PATCH 08/19] modify write

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Date:	Wed, 12 Dec 2007 10:53:53 -0200
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, glommer@...il.com, tglx@...utronix.de,
	mingo@...e.hu, ehabkost@...hat.com, jeremy@...p.org,
	avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, rusty@...tcorp.com.au,
	ak@...e.de, chrisw@...s-sol.org, rostedt@...dmis.org,
	hpa@...or.com, zach@...are.com, roland@...hat.com,
	Glauber de Oliveira Costa <gcosta@...hat.com>
Subject: [PATCH 08/19] modify write_ldt function

This patch modifies the write_ldt() function to make use
of the new struct desc_struct instead of entry_1 and entry_2
entries

Signed-off-by: Glauber de Oliveira Costa <gcosta@...hat.com>
---
 arch/x86/kernel/ldt.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index a8cdca3..7eb0c8a 100644
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -186,7 +186,7 @@ static int read_default_ldt(void __user *ptr, unsigned long bytecount)
 static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
 {
 	struct mm_struct *mm = current->mm;
-	__u32 entry_1, entry_2;
+	struct desc_struct ldt;
 	int error;
 	struct user_desc ldt_info;
 
@@ -218,21 +218,20 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
 	/* Allow LDTs to be cleared by the user. */
 	if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
 		if (oldmode || LDT_empty(&ldt_info)) {
-			entry_1 = 0;
-			entry_2 = 0;
+			memset(&ldt, 0, sizeof(ldt));
 			goto install;
 		}
 	}
 
-	entry_1 = LDT_entry_a(&ldt_info);
-	entry_2 = LDT_entry_b(&ldt_info);
+	ldt.a = LDT_entry_a(&ldt_info);
+	ldt.b = LDT_entry_b(&ldt_info);
 	if (oldmode)
-		entry_2 &= ~(1 << 20);
+		ldt.avl = 0;
 
 	/* Install the new entry ...  */
 install:
-	write_ldt_entry(mm->context.ldt, ldt_info.entry_number, entry_1,
-			entry_2);
+	write_ldt_entry(mm->context.ldt, ldt_info.entry_number,
+			ldt.a, ldt.b);
 	error = 0;
 
 out_unlock:
-- 
1.5.0.6

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