diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index 00b8bdc64c3e..827f94044cfc 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -9,48 +9,25 @@
 
 #include <asm/e820.h>
 
-#define _MAX_MEM_PATTERNS 4
+static u64 patterns[] __initdata = {
+	0,
+	0xffffffffffffffffULL,
+	0x5555555555555555ULL,
+	0xaaaaaaaaaaaaaaaaULL,
+};
 
 static void __init memtest(unsigned long start_phys, unsigned long size,
-				 unsigned pattern)
+			   u64 pattern)
 {
 	unsigned long i;
-	unsigned long *start;
+	u64 *start;
 	unsigned long start_bad;
 	unsigned long last_bad;
-	unsigned long val;
 	unsigned long start_phys_aligned;
 	unsigned long count;
 	unsigned long incr;
 
-	pattern = pattern % _MAX_MEM_PATTERNS;
-
-	switch (pattern) {
-	case 0:
-		val = 0UL;
-		break;
-	case 1:
-		val = -1UL;
-		break;
-	case 2:
-#ifdef CONFIG_X86_64
-		val = 0x5555555555555555UL;
-#else
-		val = 0x55555555UL;
-#endif
-		break;
-	case 3:
-#ifdef CONFIG_X86_64
-		val = 0xaaaaaaaaaaaaaaaaUL;
-#else
-		val = 0xaaaaaaaaUL;
-#endif
-		break;
-	default:
-		return;
-	}
-
-	incr = sizeof(unsigned long);
+	incr = sizeof(pattern);
 	start_phys_aligned = ALIGN(start_phys, incr);
 	count = (size - (start_phys_aligned - start_phys))/incr;
 	start = __va(start_phys_aligned);
@@ -58,15 +35,16 @@ static void __init memtest(unsigned long start_phys, unsigned long size,
 	last_bad = 0;
 
 	for (i = 0; i < count; i++)
-		start[i] = val;
+		start[i] = pattern;
 	for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
-		if (*start != val) {
+		if (*start != pattern) {
 			if (start_phys_aligned == last_bad + incr) {
 				last_bad += incr;
 			} else {
 				if (start_bad) {
-					printk(KERN_CONT "\n  %016lx bad mem addr %010lx - %010lx reserved",
-						val, start_bad, last_bad + incr);
+					printk(KERN_CONT "\n  %016llx bad mem addr %010lx - %010lx reserved",
+					       (unsigned long long) pattern,
+					       start_bad, last_bad + incr);
 					reserve_early(start_bad, last_bad + incr, "BAD RAM");
 				}
 				start_bad = last_bad = start_phys_aligned;
@@ -74,8 +52,9 @@ static void __init memtest(unsigned long start_phys, unsigned long size,
 		}
 	}
 	if (start_bad) {
-		printk(KERN_CONT "\n  %016lx bad mem addr %010lx - %010lx reserved",
-			val, start_bad, last_bad + incr);
+		printk(KERN_CONT "\n  %016llx bad mem addr %010lx - %010lx reserved",
+		       (unsigned long long) pattern, start_bad,
+		       last_bad + incr);
 		reserve_early(start_bad, last_bad + incr, "BAD RAM");
 	}
 }
@@ -95,13 +74,16 @@ early_param("memtest", parse_memtest);
 void __init early_memtest(unsigned long start, unsigned long end)
 {
 	u64 t_start, t_size;
-	unsigned pattern;
+	unsigned int i;
+	u64 pattern;
 
 	if (!memtest_pattern)
 		return;
 
 	printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
-	for (pattern = 0; pattern < memtest_pattern; pattern++) {
+	for (i = 0; i < memtest_pattern; i++) {
+		unsigned int idx = i % ARRAY_SIZE(patterns);
+		pattern = patterns[idx];
 		t_start = start;
 		t_size = 0;
 		while (t_start < end) {
@@ -115,8 +97,7 @@ void __init early_memtest(unsigned long start, unsigned long end)
 
 			printk(KERN_CONT "\n  %010llx - %010llx pattern %d",
 			       (unsigned long long)t_start,
-			       (unsigned long long)t_start + t_size,
-			       pattern % _MAX_MEM_PATTERNS);
+			       (unsigned long long)t_start + t_size, idx);
 
 			memtest(t_start, t_size, pattern);