diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 2fee782077c1ac5e7043efed88ad971f779bfa07..91bca355cd3105462bdb4c6756d094910ecd0c81 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -441,7 +441,7 @@ static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 static inline void poison_init_mem(void *s, size_t count)
 {
 	u32 *p = (u32 *)s;
-	while ((count = count - 4))
+	for (; count != 0; count -= 4)
 		*p++ = 0xe7fddef0;
 }