(type *)( (char *)__mptr - offsetof(type,member) );})
-static inline void prefetch(const void *x) {;}
+static inline void prefetch(const void *x) {const void * foo; foo = x;}
/*
* These are non-NULL pointers that will result in page faults
container_of(ptr, type, member)
/**
+ * list_entry - get the struct for the tail entry
+ * @ptr: the list_head head pointer.
+ * @type: the type of the struct this is embedded in.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_tail_entry(head, type, member) ({ \
+ type * tail = NULL; \
+ if ((head)->prev != (head)) { \
+ tail = list_entry((head)->prev, type, member); \
+ } \
+ tail; \
+})
+
+/**
+ * list_first_entry - get the struct for the first entry
+ * @ptr: the list_head head pointer.
+ * @type: the type of the struct this is embedded in.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_first_entry(head, type, member) \
+({ \
+ type * first = NULL; \
+ if ((head)->next != (head)) { \
+ first = list_entry((head)->next, type, member); \
+ } \
+ first; \
+ })
+
+
+
+
+/**
* list_for_each - iterate over a list
* @pos: the &struct list_head to use as a loop counter.
* @head: the head for your list.
