diff mbox

[U-Boot,v2,04/12] list: Add list_last_entry() to find the last entry

Message ID 1475721740-15124-5-git-send-email-sjg@chromium.org
State Accepted
Delegated to: Bin Meng
Headers show

Commit Message

Simon Glass Oct. 6, 2016, 2:42 a.m. UTC 
We have list_first_entry() but in some cases it is useful to find the last
item added to the list. Add a macro for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
---

Changes in v2: None

 include/linux/list.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

Comments

Bin Meng Oct. 8, 2016, 4:23 a.m. UTC | #1 
On Thu, Oct 6, 2016 at 10:42 AM, Simon Glass <sjg@chromium.org> wrote:
> We have list_first_entry() but in some cases it is useful to find the last
> item added to the list. Add a macro for this.
>
> Signed-off-by: Simon Glass <sjg@chromium.org>
> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
> ---
>
> Changes in v2: None
>
>  include/linux/list.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>

applied to u-boot-x86, thanks!
diff mbox

Patch

diff --git a/include/linux/list.h b/include/linux/list.h
index b78851c..5b8d1df 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -338,6 +338,17 @@  static inline void list_splice_tail_init(struct list_head *list,
 	list_entry((ptr)->next, type, member)
 
 /**
+ * list_last_entry - get the last element from a list
+ * @ptr:	the list head to take the element from.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Note, that list is expected to be not empty.
+ */
+#define list_last_entry(ptr, type, member) \
+	list_entry((ptr)->prev, type, member)
+
+/**
  * list_for_each	-	iterate over a list
  * @pos:	the &struct list_head to use as a loop cursor.
  * @head:	the head for your list.