x86: 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: NGlauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

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: