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From: Ricardo Martinez <ricardo.martinez@linux.intel.com>
To: netdev@vger.kernel.org, linux-wireless@vger.kernel.org
Cc: kuba@kernel.org, davem@davemloft.net, johannes@sipsolutions.net,
	ryazanov.s.a@gmail.com, loic.poulain@linaro.org,
	m.chetan.kumar@intel.com, chandrashekar.devegowda@intel.com,
	linuxwwan@intel.com, chiranjeevi.rapolu@linux.intel.com,
	haijun.liu@mediatek.com, amir.hanania@intel.com,
	andriy.shevchenko@linux.intel.com, dinesh.sharma@intel.com,
	eliot.lee@intel.com, ilpo.johannes.jarvinen@intel.com,
	moises.veleta@intel.com, pierre-louis.bossart@intel.com,
	muralidharan.sethuraman@intel.com,
	Soumya.Prakash.Mishra@intel.com, sreehari.kancharla@intel.com,
	madhusmita.sahu@intel.com,
	Ricardo Martinez <ricardo.martinez@linux.intel.com>
Subject: [PATCH net-next v8 01/14] list: Add list_next_entry_circular() and list_prev_entry_circular()
Date: Fri,  6 May 2022 11:12:57 -0700	[thread overview]
Message-ID: <20220506181310.2183829-2-ricardo.martinez@linux.intel.com> (raw)
In-Reply-To: <20220506181310.2183829-1-ricardo.martinez@linux.intel.com>

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@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.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.
-- 
2.25.1


  reply	other threads:[~2022-05-06 18:13 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-06 18:12 [PATCH net-next v8 00/14] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem Ricardo Martinez
2022-05-06 18:12 ` Ricardo Martinez [this message]
2022-05-06 18:12 ` [PATCH net-next v8 02/14] net: skb: introduce skb_data_area_size() Ricardo Martinez
2022-05-09 16:49   ` Jakub Kicinski
2022-05-09 18:34     ` Sergey Ryazanov
2022-05-09 19:50       ` Jakub Kicinski
2022-05-09 21:37         ` Martinez, Ricardo
2022-05-10 10:01           ` Andy Shevchenko
2022-05-10 13:37         ` Sergey Ryazanov
2022-05-06 18:12 ` [PATCH net-next v8 03/14] net: wwan: t7xx: Add control DMA interface Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 04/14] net: wwan: t7xx: Add core components Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 05/14] net: wwan: t7xx: Add port proxy infrastructure Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 06/14] net: wwan: t7xx: Add control port Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 07/14] net: wwan: t7xx: Add AT and MBIM WWAN ports Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 08/14] net: wwan: t7xx: Data path HW layer Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 09/14] net: wwan: t7xx: Add data path interface Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 10/14] net: wwan: t7xx: Add WWAN network interface Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 11/14] net: wwan: t7xx: Introduce power management Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 12/14] net: wwan: t7xx: Runtime PM Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 13/14] net: wwan: t7xx: Device deep sleep lock/unlock Ricardo Martinez
2022-05-06 18:13 ` [PATCH net-next v8 14/14] net: wwan: t7xx: Add maintainers and documentation Ricardo Martinez
2022-05-09 11:00 ` [PATCH net-next v8 00/14] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem patchwork-bot+netdevbpf

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