diff --git a/mm/sparse.h b/mm/sparse.h
index 530692cdd516..4ee507c34b98 100644
--- a/mm/sparse.h
+++ b/mm/sparse.h
@@ -20,7 +20,7 @@ void sparse_sections_init(void);
 int sparse_index_init(unsigned long section_nr, int nid);
 
 static inline void sparse_init_one_section(struct mem_section *ms,
-		unsigned long pnum, struct page *mem_map,
+		unsigned long section_nr, struct page *mem_map,
 		struct mem_section_usage *usage, unsigned long flags)
 {
 	unsigned long coded_mem_map;
@@ -32,7 +32,7 @@ static inline void sparse_init_one_section(struct mem_section *ms,
 	 * page_to_pfn() on !CONFIG_SPARSEMEM_VMEMMAP can simply subtract it
 	 * from the page pointer to obtain the PFN.
 	 */
-	coded_mem_map = (unsigned long)(mem_map - section_nr_to_pfn(pnum));
+	coded_mem_map = (unsigned long)(mem_map - section_nr_to_pfn(section_nr));
 	VM_WARN_ON_ONCE(coded_mem_map & ~SECTION_MAP_MASK);
 
 	ms->section_mem_map &= ~SECTION_MAP_MASK;