diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index c6c0c41..9717081 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -256,9 +256,9 @@
 #define part_stat_read(part, field)					\
 ({									\
 	typeof((part)->dkstats->field) res = 0;				\
-	int i;								\
-	for_each_possible_cpu(i)					\
-		res += per_cpu_ptr((part)->dkstats, i)->field;		\
+	unsigned int _cpu;						\
+	for_each_possible_cpu(_cpu)					\
+		res += per_cpu_ptr((part)->dkstats, _cpu)->field;	\
 	res;								\
 })