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From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/8] list: add list_first_entry_or_null()
Date: Fri, 10 Jan 2014 12:05:52 +0100	[thread overview]
Message-ID: <1389351959-20448-2-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1389351959-20448-1-git-send-email-s.hauer@pengutronix.de>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 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


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  reply	other threads:[~2014-01-10 11:06 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-10 11:05 bootm + devicetree + much memory Sascha Hauer
2014-01-10 11:05 ` Sascha Hauer [this message]
2014-01-10 11:05 ` [PATCH 2/8] bootm: introduce bootm_load_os helper Sascha Hauer
2014-01-10 11:05 ` [PATCH 3/8] ARM: bootm: move os loading to do_bootm_linux Sascha Hauer
2014-01-10 11:05 ` [PATCH 4/8] bootm: introduce bootm_load_initrd helper Sascha Hauer
2014-01-10 11:05 ` [PATCH 5/8] bootm: introduce bootm_load_devicetree helper Sascha Hauer
2014-01-10 11:05 ` [PATCH 6/8] ARM: bootm: locate zImage higher into RAM Sascha Hauer
2014-01-10 11:05 ` [PATCH 7/8] ARM: bootm: determine RAM start in separate function Sascha Hauer
2014-01-10 11:05 ` [PATCH 8/8] ARM: bootm: pass free memory to __do_bootm_linux Sascha Hauer

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