linux-kernel - [PATCH 2/2] list: introduce list_last_entry_or

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Message-Id: <1432845405-28062-1-git-send-email-ddstreet@ieee.org>
Date:	Thu, 28 May 2015 16:36:45 -0400
From:	Dan Streetman <ddstreet@...e.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ken Helias <kenhelias@...email.de>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Andrey Utkin <andrey.krieger.utkin@...il.com>,
	Masahiro Yamada <yamada.m@...panasonic.com>,
	linux-kernel@...r.kernel.org, Dan Streetman <ddstreet@...e.org>
Subject: [PATCH 2/2] list: introduce list_last_entry_or_null

non-rcu variant of list_last_or_null_rcu

Signed-off-by: Dan Streetman <ddstreet@...e.org>
---
 include/linux/list.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/list.h b/include/linux/list.h
index feb773c..38577f89 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -385,6 +385,17 @@ static inline void list_splice_tail_init(struct list_head *list,
 	(!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL)
 
 /**
+ * list_last_entry_or_null - 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_head within the struct.
+ *
+ * Note that if the list is empty, it returns NULL.
+ */
+#define list_last_entry_or_null(ptr, type, member) \
+	(!list_empty(ptr) ? list_last_entry(ptr, type, member) : NULL)
+
+/**
  * list_next_entry - get the next element in list
  * @pos:	the type * to cursor
  * @member:	the name of the list_head within the struct.
-- 
2.1.0

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