Blackfin: implement nmi_watchdog for SMP on BF561

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/kernel/time-ts.c b/arch/blackfin/kernel/time-ts.c
index a351f97..41a9075 100644
--- a/arch/blackfin/kernel/time-ts.c
+++ b/arch/blackfin/kernel/time-ts.c
@@ -21,6 +21,7 @@
 #include <asm/blackfin.h>
 #include <asm/time.h>
 #include <asm/gptimers.h>
+#include <asm/nmi.h>
 
 /* Accelerators for sched_clock()
  * convert from cycles(64bits) => nanoseconds (64bits)
@@ -309,6 +310,9 @@
 
 	smp_mb();
 	evt->event_handler(evt);
+
+	touch_nmi_watchdog();
+
 	return IRQ_HANDLED;
 }