diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index f388203..31e95ac 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -60,6 +60,8 @@
 void memblock_trim_memory(phys_addr_t align);
 
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
+			    unsigned long  *end_pfn);
 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 			  unsigned long *out_end_pfn, int *out_nid);