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Message-Id: <20220114010627.21104-2-ricardo.martinez@linux.intel.com>
Date: Thu, 13 Jan 2022 18:06:15 -0700
From: Ricardo Martinez <ricardo.martinez@...ux.intel.com>
To: netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Cc: kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
ryazanov.s.a@...il.com, loic.poulain@...aro.org,
m.chetan.kumar@...el.com, chandrashekar.devegowda@...el.com,
linuxwwan@...el.com, chiranjeevi.rapolu@...ux.intel.com,
haijun.liu@...iatek.com, amir.hanania@...el.com,
andriy.shevchenko@...ux.intel.com, dinesh.sharma@...el.com,
eliot.lee@...el.com, ilpo.johannes.jarvinen@...el.com,
moises.veleta@...el.com, pierre-louis.bossart@...el.com,
muralidharan.sethuraman@...el.com, Soumya.Prakash.Mishra@...el.com,
sreehari.kancharla@...el.com,
Ricardo Martinez <ricardo.martinez@...ux.intel.com>
Subject: [PATCH net-next v4 01/13] list: Add list_next_entry_circular() and list_prev_entry_circular()
Add macros to get the next or previous entries and wraparound if
needed. For example, calling list_next_entry_circular() on the last
element should return the first element in the list.
Signed-off-by: Ricardo Martinez <ricardo.martinez@...ux.intel.com>
---
include/linux/list.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/include/linux/list.h b/include/linux/list.h
index dd6c2041d09c..c147eeb2d39d 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -563,6 +563,19 @@ static inline void list_splice_tail_init(struct list_head *list,
#define list_next_entry(pos, member) \
list_entry((pos)->member.next, typeof(*(pos)), member)
+/**
+ * list_next_entry_circular - get the next element in list
+ * @pos: the type * to cursor.
+ * @head: the list head to take the element from.
+ * @member: the name of the list_head within the struct.
+ *
+ * Wraparound if pos is the last element (return the first element).
+ * Note, that list is expected to be not empty.
+ */
+#define list_next_entry_circular(pos, head, member) \
+ (list_is_last(&(pos)->member, head) ? \
+ list_first_entry(head, typeof(*(pos)), member) : list_next_entry(pos, member))
+
/**
* list_prev_entry - get the prev element in list
* @pos: the type * to cursor
@@ -571,6 +584,19 @@ static inline void list_splice_tail_init(struct list_head *list,
#define list_prev_entry(pos, member) \
list_entry((pos)->member.prev, typeof(*(pos)), member)
+/**
+ * list_prev_entry_circular - get the prev element in list
+ * @pos: the type * to cursor.
+ * @head: the list head to take the element from.
+ * @member: the name of the list_head within the struct.
+ *
+ * Wraparound if pos is the first element (return the last element).
+ * Note, that list is expected to be not empty.
+ */
+#define list_prev_entry_circular(pos, head, member) \
+ (list_is_first(&(pos)->member, head) ? \
+ list_last_entry(head, typeof(*(pos)), member) : list_prev_entry(pos, member))
+
/**
* list_for_each - iterate over a list
* @pos: the &struct list_head to use as a loop cursor.
--
2.17.1
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