x86: change write_ldt_entry signature

this patch changes the signature of write_ldt_entry.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
CC: Zachary Amsden <zach@vmware.com>
CC: Jeremy Fitzhardinge <Jeremy.Fitzhardinge.citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 7f98c63..72dd14d 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -357,11 +357,11 @@
 }
 
 static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
-				u32 low, u32 high)
+				const void *ptr)
 {
 	unsigned long lp = (unsigned long)&dt[entrynum];
 	xmaddr_t mach_lp = virt_to_machine(lp);
-	u64 entry = (u64)high << 32 | low;
+	u64 entry = *(u64 *)ptr;
 
 	preempt_disable();