diff --git a/sys/compat/linuxkpi/common/include/linux/kernel.h b/sys/compat/linuxkpi/common/include/linux/kernel.h
index b60b346a53c9..8066c91d432d 100644
--- a/sys/compat/linuxkpi/common/include/linux/kernel.h
+++ b/sys/compat/linuxkpi/common/include/linux/kernel.h
@@ -130,9 +130,11 @@
 #define	ALIGN(x, y)		roundup2((x), (y))
 #undef PTR_ALIGN
 #define	PTR_ALIGN(p, a)		((__typeof(p))ALIGN((uintptr_t)(p), (a)))
+#define	IS_ALIGNED(x, a)	(((x) & ((__typeof(x))(a) - 1)) == 0)
 #define	DIV_ROUND_UP(x, n)	howmany(x, n)
 #define	__KERNEL_DIV_ROUND_UP(x, n)	howmany(x, n)
 #define	DIV_ROUND_UP_ULL(x, n)	DIV_ROUND_UP((unsigned long long)(x), (n))
+#define	DIV_ROUND_DOWN_ULL(x, n) (((unsigned long long)(x) / (n)) * (n))
 #define	FIELD_SIZEOF(t, f)	sizeof(((t *)0)->f)
 
 #define	printk(...)		printf(__VA_ARGS__)