ppc64: add missing gcc barrier in softirq code.

include/asm-ppc64/softirq.h

@@ -11,19 +11,18 @@
 #include <asm/atomic.h>
 #include <asm/hardirq.h>
 
-
 #define local_bh_disable()	do { local_bh_count(smp_processor_id())++; barrier(); } while (0)
 #define __local_bh_enable()	do { barrier(); local_bh_count(smp_processor_id())--; } while (0)
 
 #define local_bh_enable()  \
 do {                                                    \
+	barrier();					\
         if (!--local_bh_count(smp_processor_id())       \
             && softirq_pending(smp_processor_id())) {   \
                 do_softirq();                           \
         }                                               \
 } while (0)
 
-
 #define in_softirq() (local_bh_count(smp_processor_id()) != 0)
 
 #endif	/* __ASM_SOFTIRQ_H */