[PATCH] x86-64: Fix ENOSYS in system call tracing

This patch:

- out of range system calls failing to return -ENOSYS under
  system call tracing

[AK: split out from another patch by Jan as separate bugfix]
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>

arch/x86_64/kernel/entry.S

@@ -315,6 +315,8 @@ tracesys:
 	LOAD_ARGS ARGOFFSET  /* reload args from stack in case ptrace changed it */
 	RESTORE_REST
 	cmpq $__NR_syscall_max,%rax
+	movq $-ENOSYS,%rcx
+	cmova %rcx,%rax
 	ja  1f
 	movq %r10,%rcx	/* fixup for C */
 	call *sys_call_table(,%rax,8)