diff --git a/sys/compat/linuxkpi/common/include/linux/string.h b/sys/compat/linuxkpi/common/include/linux/string.h
--- a/sys/compat/linuxkpi/common/include/linux/string.h
+++ b/sys/compat/linuxkpi/common/include/linux/string.h
@@ -236,4 +236,17 @@
 		return (memset64((uint64_t *)p, (uintptr_t)v, n));
 }
 
+static inline void
+memcpy_and_pad(void *dst, size_t dstlen, const void *src, size_t len, int ch)
+{
+
+	if (len >= dstlen) {
+		memcpy(dst, src, dstlen);
+	} else {
+		memcpy(dst, src, len);
+		/* Pad with given padding character. */
+		memset((char *)dst + len, ch, dstlen - len);
+	}
+}
+
 #endif	/* _LINUXKPI_LINUX_STRING_H_ */