Re: [PATCH] Introduce a handy list_first_entry macro

On Tue, 17 Apr 2007 15:18:56 +0400 Pavel Emelianov wrote:

There are many places in the kernel where the construction like

foo = list_entry(head->next, struct foo_struct, list);

are used.
The code might look more descriptive and neat if using the macro

list_first_entry(head, type, member) \
list_entry((head)->next, type, member)

Here is the macro itself and the examples of its usage in the
generic code. If it will turn out to be useful, I can prepare
the set of patches to inject in into arch-specific code, drivers,
networking, etc.

Signed-off-by: Pavel Emelianov <xemul@xxxxxxxxxx>
Signed-off-by: Kirill Korotaev <dev@xxxxxxxxxx>

---
diff --git a/include/linux/list.h b/include/linux/list.h
index fd59659..71318fc 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -425,6 +425,9 @@ static inline void list_splice_init_rcu(
#define list_entry(ptr, type, member) \
container_of(ptr, type, member)

+#define list_first_entry(ptr, type, member) \
+ list_entry((ptr)->next, type, member)
+

Please provide kernel-doc for that like the rest of list.h has.

/**
* list_for_each - iterate over a list
* @pos: the &struct list_head to use as a loop cursor.


---
~Randy
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