diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h
index 50a4969..8d7f7c1 100644
--- a/arch/um/include/kern_util.h
+++ b/arch/um/include/kern_util.h
@@ -117,4 +117,7 @@
 
 extern void copy_sc(union uml_pt_regs *regs, void *from);
 
+unsigned long to_irq_stack(int sig, unsigned long *mask_out);
+unsigned long from_irq_stack(int nested);
+
 #endif