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
@@ -38,6 +38,7 @@
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/err.h>
+#include <linux/bitops.h> /* for BITS_PER_LONG */
 
 #include <sys/libkern.h>
 
@@ -196,4 +197,34 @@
 	return (-E2BIG);
 }
 
-#endif					/* _LINUXKPI_LINUX_STRING_H_ */
+static inline void *
+memset32(uint32_t *b, uint32_t c, size_t len)
+{
+	uint32_t *dst = b;
+
+	while (len--)
+		*dst++ = c;
+	return (b);
+}
+
+static inline void *
+memset64(uint64_t *b, uint64_t c, size_t len)
+{
+	uint64_t *dst = b;
+
+	while (len--)
+		*dst++ = c;
+	return (b);
+}
+
+static inline void *
+memset_p(void **p, void *v, size_t n)
+{
+
+	if (BITS_PER_LONG == 32)
+		return (memset32((uint32_t *)p, (uintptr_t)v, n));
+	else
+		return (memset64((uint64_t *)p, (uintptr_t)v, n));
+}
+
+#endif	/* _LINUXKPI_LINUX_STRING_H_ */