diff --git a/mm/internal.h b/mm/internal.h
index d80300392a19..9c298afb9688 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -572,17 +572,6 @@ static inline void mminit_verify_zonelist(void)
 }
 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 
-/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
-#if defined(CONFIG_SPARSEMEM)
-extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
-				unsigned long *end_pfn);
-#else
-static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
-				unsigned long *end_pfn)
-{
-}
-#endif /* CONFIG_SPARSEMEM */
-
 #define NODE_RECLAIM_NOSCAN	-2
 #define NODE_RECLAIM_FULL	-1
 #define NODE_RECLAIM_SOME	0
diff --git a/mm/sparse.c b/mm/sparse.c
index d21c6e5910d0..952f06d8f373 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -126,7 +126,7 @@ static inline int sparse_early_nid(struct mem_section *section)
 }
 
 /* Validate the physical addressing limitations of the model */
-void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
+static void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
 						unsigned long *end_pfn)
 {
 	unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);