"pointer type mismatch in container_of()"); \
((type *)(__mptr - offsetof(type, member))); })
+/**
+ * container_of_const - cast a member of a structure out to the containing
+ * structure and preserve the const-ness of the pointer
+ * @ptr: the pointer to the member
+ * @type: the type of the container struct this is embedded in.
+ * @member: the name of the member within the struct.
+ */
+#define container_of_const(ptr, type, member) \
+ _Generic(ptr, \
+ const typeof(*(ptr)) *: ((const type *)container_of(ptr, type, member)),\
+ default: ((type *)container_of(ptr, type, member)) \
+ )
+
#endif /* _LINUX_CONTAINER_OF_H */