sparc64: Implement IRQ stacks.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/include/asm/irq_64.h b/arch/sparc/include/asm/irq_64.h
index 3473e25..e3dd930 100644
--- a/arch/sparc/include/asm/irq_64.h
+++ b/arch/sparc/include/asm/irq_64.h
@@ -93,4 +93,8 @@
 void __trigger_all_cpu_backtrace(void);
 #define trigger_all_cpu_backtrace() __trigger_all_cpu_backtrace()
 
+extern void *hardirq_stack[NR_CPUS];
+extern void *softirq_stack[NR_CPUS];
+#define __ARCH_HAS_DO_SOFTIRQ
+
 #endif