diff --git a/arch/ish/include/emu/exec.h b/arch/ish/include/emu/exec.h
index 74ee2d982ded1c..6ef02e41f9a515 100644
--- a/arch/ish/include/emu/exec.h
+++ b/arch/ish/include/emu/exec.h
@@ -1,6 +1,10 @@
 #ifndef __ISH_EXEC_H
 #define __ISH_EXEC_H
 
+struct emu;
+struct emu_mm;
+struct pt_regs;
+
 extern int emu_run_to_interrupt(struct emu *emu, struct pt_regs *regs);
 extern void emu_poke_cpu(int cpu);
 
diff --git a/arch/ish/kernel/smp.c b/arch/ish/kernel/smp.c
index f7978f149481ed..966df967ca0a88 100644
--- a/arch/ish/kernel/smp.c
+++ b/arch/ish/kernel/smp.c
@@ -11,7 +11,7 @@
 #include "time_user.h"
 #include "threads_user.h"
 
-void __init smp_prepare_boot_cpu()
+void __init smp_prepare_boot_cpu(void)
 {
 }
 
@@ -91,7 +91,7 @@ static irqreturn_t ipi_irq(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-void smp_send_stop()
+void smp_send_stop(void)
 {
 	printk("TODO: actually stop the threads\n");
 }