diff --git a/sys/compat/linuxkpi/common/include/linux/slab.h b/sys/compat/linuxkpi/common/include/linux/slab.h
--- a/sys/compat/linuxkpi/common/include/linux/slab.h
+++ b/sys/compat/linuxkpi/common/include/linux/slab.h
@@ -90,6 +90,8 @@
 /* drm-kmod 5.4 compat */
 #define kfree_async(ptr)	kfree(ptr);
 
+#define ZERO_OR_NULL_PTR(x)	((x) == NULL)
+
 static inline gfp_t
 linux_check_m_flags(gfp_t flags)
 {