linux-kernel - [PATCH 1/4] list: introduce list_is

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Message-Id: <305feb971ae11e192f35f25d66bb7b2e28e06c39.1449755818.git.geliangtang@163.com>
Date:	Thu, 10 Dec 2015 22:17:15 +0800
From:	Geliang Tang <geliangtang@....com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jan Kara <jack@...e.cz>, Josef Bacik <jbacik@...com>,
	Josh Triplett <josh@...htriplett.org>
Cc:	Geliang Tang <geliangtang@....com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>,
	Jens Axboe <axboe@...nel.dk>, live-patching@...r.kernel.org,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] list: introduce list_is_first()

We already have list_is_last(), it makes sense to also add
list_is_first() for consistency. This list utility function
to check for first element in a list.

Signed-off-by: Geliang Tang <geliangtang@....com>
---
 include/linux/list.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/list.h b/include/linux/list.h
index 5356f4d..2c43ef4 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -170,6 +170,17 @@ static inline void list_move_tail(struct list_head *list,
 }
 
 /**
+ * list_is_first - tests whether @list is the first entry in list @head
+ * @list: the entry to test
+ * @head: the head of the list
+ */
+static inline int list_is_first(const struct list_head *list,
+				const struct list_head *head)
+{
+	return list->prev == head;
+}
+
+/**
  * list_is_last - tests whether @list is the last entry in list @head
  * @list: the entry to test
  * @head: the head of the list
-- 
2.5.0


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