diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index a1a364e..c2b5561 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -1805,3 +1805,21 @@
 	__asm__ __volatile__("wrpr	%0, 0, %%pstate"
 			     : : "r" (pstate));
 }
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+
+void online_page(struct page *page)
+{
+	ClearPageReserved(page);
+	set_page_count(page, 0);
+	free_cold_page(page);
+	totalram_pages++;
+	num_physpages++;
+}
+
+int remove_memory(u64 start, u64 size)
+{
+	return -EINVAL;
+}
+
+#endif /* CONFIG_MEMORY_HOTPLUG */