lib/string.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/string.c b/lib/string.c
index 77bd0b1d3296..b2de45a581f4 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -29,6 +29,7 @@
 #include <linux/errno.h>
 #include <linux/slab.h>
 
+#include <asm/unaligned.h>
 #include <asm/byteorder.h>
 #include <asm/word-at-a-time.h>
 #include <asm/page.h>
@@ -935,6 +936,21 @@ __visible int memcmp(const void *cs, const void *ct, size_t count)
 	const unsigned char *su1, *su2;
 	int res = 0;
 
+#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+	if (count >= sizeof(unsigned long)) {
+		const unsigned long *u1 = cs;
+		const unsigned long *u2 = ct;
+		do {
+			if (get_unaligned(u1) != get_unaligned(u2))
+				break;
+			u1++;
+			u2++;
+			count -= sizeof(unsigned long);
+		} while (count >= sizeof(unsigned long));
+		cs = u1;
+		ct = u2;
+	}
+#endif
 	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
 		if ((res = *su1 - *su2) != 0)
 			break;