x86: use _ASM_EXTABLE macro in include/asm-x86/futex.h

Use the _ASM_EXTABLE macro from <asm/asm.h>, instead of open-coding
__ex_table entires in include/asm-x86/futex.h.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/asm-x86/futex.h

@@ -17,11 +17,8 @@
 "2:	.section .fixup,\"ax\"\n				\
 3:	mov	%3, %1\n					\
 	jmp	2b\n						\
-	.previous\n						\
-	.section __ex_table,\"a\"\n				\
-	.align	8\n"						\
-	_ASM_PTR "1b,3b\n					\
-	.previous"						\
+	.previous\n"						\
+	_ASM_EXTABLE(1b,3b)					\
 	: "=r" (oldval), "=r" (ret), "+m" (*uaddr)		\
 	: "i" (-EFAULT), "0" (oparg), "1" (0))
 
@@ -35,11 +32,9 @@
 3:	.section .fixup,\"ax\"\n				\
 4:	mov	%5, %1\n					\
 	jmp	3b\n						\
-	.previous\n						\
-	.section __ex_table,\"a\"\n				\
-	.align	8\n"						\
-	_ASM_PTR "1b,4b,2b,4b\n					\
-	.previous"						\
+	.previous\n"						\
+	_ASM_EXTABLE(1b,4b)					\
+	_ASM_EXTABLE(2b,4b)					\
 	: "=&a" (oldval), "=&r" (ret), "+m" (*uaddr),		\
 	  "=&r" (tem)						\
 	: "r" (oparg), "i" (-EFAULT), "1" (0))
@@ -111,18 +106,12 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
 		return -EFAULT;
 
 	__asm__ __volatile__(
-
 		"1:	lock; cmpxchgl %3, %1			\n"
 		"2:	.section .fixup, \"ax\"			\n"
 		"3:	mov     %2, %0				\n"
 		"	jmp     2b				\n"
 		"	.previous				\n"
-
-		"	.section __ex_table, \"a\"		\n"
-		"	.align  8				\n"
-			_ASM_PTR " 1b,3b			\n"
-		"	.previous				\n"
-
+		_ASM_EXTABLE(1b,3b)
 		: "=a" (oldval), "+m" (*uaddr)
 		: "i" (-EFAULT), "r" (newval), "0" (oldval)
 		: "memory"