x86: use the same data type for tls_array.

This patch changes the type of tls_array in x86_64 to
a desc_struct. Now, both i386 and x86_64 tls_array have
the same type, and code accessing it can be shared.
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>

include/asm-x86/desc_64.h

@@ -150,7 +150,7 @@ static inline void set_ldt(void *addr, int entries)
 static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
 {
 	unsigned int i;
-	u64 *gdt = (u64 *)(get_cpu_gdt_table(cpu) + GDT_ENTRY_TLS_MIN);
+	struct desc_struct *gdt = (get_cpu_gdt_table(cpu) + GDT_ENTRY_TLS_MIN);
 
 	for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
 		gdt[i] = t->tls_array[i];

include/asm-x86/processor_64.h

@@ -19,6 +19,7 @@
 #include <linux/personality.h>
 #include <linux/cpumask.h>
 #include <asm/processor-flags.h>
+#include <asm/desc_defs.h>
 
 #define TF_MASK		0x00000100
 #define IF_MASK		0x00000200
@@ -244,7 +245,7 @@ struct thread_struct {
  *               goes into MSR_IA32_DS_AREA */
 	unsigned long	ds_area_msr;
 /* cached TLS descriptors. */
-	u64 tls_array[GDT_ENTRY_TLS_ENTRIES];
+	struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
 } __attribute__((aligned(16)));
 
 #define INIT_THREAD  { \