x86: call nmi_watchdog_default in i386

this does not exist, so it will be an empty macro

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/nmi.h b/include/asm-x86/nmi.h
index 2b94199..1e36302 100644
--- a/include/asm-x86/nmi.h
+++ b/include/asm-x86/nmi.h
@@ -39,6 +39,9 @@
 #ifdef CONFIG_X86_64
 extern void default_do_nmi(struct pt_regs *);
 extern void die_nmi(char *str, struct pt_regs *regs, int do_panic);
+extern void nmi_watchdog_default(void);
+#else
+#define nmi_watchdog_default() do {} while (0)
 #endif
 
 extern int check_nmi_watchdog(void);
@@ -50,7 +53,6 @@
 extern void release_perfctr_nmi(unsigned int);
 extern int reserve_evntsel_nmi(unsigned int);
 extern void release_evntsel_nmi(unsigned int);
-extern void nmi_watchdog_default(void);
 
 extern void setup_apic_nmi_watchdog(void *);
 extern void stop_apic_nmi_watchdog(void *);