Implement a proper block layer with partition support.

[pintos-anon] / src / lib / kernel / list.h

diff --git a/src/lib/kernel/list.h b/src/lib/kernel/list.h
index a041299f6701f02e9d840dc52dab9ab4077702d9..82efbb5b1c19053a4b7c68723f358bb413ece4c2 100644 (file)
--- a/src/lib/kernel/list.h
+++ b/src/lib/kernel/list.h
@@ -105,8 +105,22 @@ struct list
    name of the outer structure STRUCT and the member name MEMBER
    of the list element.  See the big comment at the top of the
    file for an example. */
-#define list_entry(LIST_ELEM, STRUCT, MEMBER)                              \
-        ((STRUCT *) ((uint8_t *) (LIST_ELEM) - offsetof (STRUCT, MEMBER)))
+#define list_entry(LIST_ELEM, STRUCT, MEMBER)           \
+        ((STRUCT *) ((uint8_t *) &(LIST_ELEM)->next     \
+                     - offsetof (STRUCT, MEMBER.next)))
+
+/* List initialization.
+
+   A list may be initialized by calling list_init():
+
+       struct list my_list;
+       list_init (&my_list);
+
+   or with an initializer using LIST_INITIALIZER:
+
+       struct list my_list = LIST_INITIALIZER (my_list); */
+#define LIST_INITIALIZER(NAME) { { NULL, &(NAME).tail }, \
+                                 { &(NAME).head, NULL } }
 
 void list_init (struct list *);