From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1W1Zuw-0006iP-VI for barebox@lists.infradead.org; Fri, 10 Jan 2014 11:06:23 +0000 From: Sascha Hauer Date: Fri, 10 Jan 2014 12:05:52 +0100 Message-Id: <1389351959-20448-2-git-send-email-s.hauer@pengutronix.de> In-Reply-To: <1389351959-20448-1-git-send-email-s.hauer@pengutronix.de> References: <1389351959-20448-1-git-send-email-s.hauer@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 1/8] list: add list_first_entry_or_null() To: barebox@lists.infradead.org Signed-off-by: Sascha Hauer --- include/linux/list.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/list.h b/include/linux/list.h index 5ae90b4..bc63ece 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -292,6 +292,17 @@ static inline void list_splice_init(struct list_head *list, list_entry((head)->prev, type, member) /** + * list_first_entry_or_null - get the first 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 if the list is empty, it returns NULL. + */ +#define list_first_entry_or_null(ptr, type, member) \ + (!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL) + +/** * list_for_each - iterate over a list * @pos: the &struct list_head to use as a loop cursor. * @head: the head for your list. -- 1.8.5.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox