diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h b/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h
index b8f9ad5..8eea90f 100644
--- a/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h
+++ b/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h
@@ -11,7 +11,11 @@
 	return mmu_psize_defs[psize].ap;
 }
 
+#ifdef CONFIG_PPC_RADIX_MMU
 extern void radix__tlbiel_all(unsigned int action);
+#else
+static inline void radix__tlbiel_all(unsigned int action) { WARN_ON(1); };
+#endif
 
 extern void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma,
 					   unsigned long start, unsigned long end);