From: Jeff Liu <jeff.liu@oracle.com>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] [PATCH 1/6] list: introduce list_last_entry_or_null()
Date: Fri, 15 Nov 2013 12:31:15 +0800 [thread overview]
Message-ID: <5285A393.8000808@oracle.com> (raw)
From: Jie Liu <jeff.liu@oracle.com>
Introduce a trivial helper list_last_entry_or_null() to fetch the
last entry from a list, return NULL if the list is empty.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
---
include/linux/list.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/linux/list.h b/include/linux/list.h
index ef95941..3337249 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -384,6 +384,17 @@ 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_struct 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_struct within the struct.
--
1.8.3.2
WARNING: multiple messages have this Message-ID (diff)
From: Jeff Liu <jeff.liu@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: jfs-discussion@lists.sourceforge.net, jiri@resnulli.us,
gregkh@linuxfoundation.org, oleg@redhat.com,
"xfs@oss.sgi.com" <xfs@oss.sgi.com>,
cluster-devel@redhat.com, linux-mtd@lists.infradead.org,
akpm@linux-foundation.org
Subject: [PATCH 1/6] list: introduce list_last_entry_or_null()
Date: Fri, 15 Nov 2013 12:31:15 +0800 [thread overview]
Message-ID: <5285A393.8000808@oracle.com> (raw)
From: Jie Liu <jeff.liu@oracle.com>
Introduce a trivial helper list_last_entry_or_null() to fetch the
last entry from a list, return NULL if the list is empty.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
---
include/linux/list.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/linux/list.h b/include/linux/list.h
index ef95941..3337249 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -384,6 +384,17 @@ 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_struct 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_struct within the struct.
--
1.8.3.2
WARNING: multiple messages have this Message-ID (diff)
From: Jeff Liu <jeff.liu@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: jfs-discussion@lists.sourceforge.net, jiri@resnulli.us,
gregkh@linuxfoundation.org, oleg@redhat.com,
"xfs@oss.sgi.com" <xfs@oss.sgi.com>,
cluster-devel@redhat.com, linux-mtd@lists.infradead.org,
akpm@linux-foundation.org
Subject: [PATCH 1/6] list: introduce list_last_entry_or_null()
Date: Fri, 15 Nov 2013 12:31:15 +0800 [thread overview]
Message-ID: <5285A393.8000808@oracle.com> (raw)
From: Jie Liu <jeff.liu@oracle.com>
Introduce a trivial helper list_last_entry_or_null() to fetch the
last entry from a list, return NULL if the list is empty.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
---
include/linux/list.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/linux/list.h b/include/linux/list.h
index ef95941..3337249 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -384,6 +384,17 @@ 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_struct 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_struct within the struct.
--
1.8.3.2
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
WARNING: multiple messages have this Message-ID (diff)
From: Jeff Liu <jeff.liu@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org, "xfs@oss.sgi.com" <xfs@oss.sgi.com>,
cluster-devel@redhat.com, linux-mtd@lists.infradead.org,
jfs-discussion@lists.sourceforge.net, oleg@redhat.com,
jiri@resnulli.us, gregkh@linuxfoundation.org
Subject: [PATCH 1/6] list: introduce list_last_entry_or_null()
Date: Fri, 15 Nov 2013 12:31:15 +0800 [thread overview]
Message-ID: <5285A393.8000808@oracle.com> (raw)
From: Jie Liu <jeff.liu@oracle.com>
Introduce a trivial helper list_last_entry_or_null() to fetch the
last entry from a list, return NULL if the list is empty.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
---
include/linux/list.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/linux/list.h b/include/linux/list.h
index ef95941..3337249 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -384,6 +384,17 @@ 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_struct 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_struct within the struct.
--
1.8.3.2
next reply other threads:[~2013-11-15 4:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-15 4:31 Jeff Liu [this message]
2013-11-15 4:31 ` [PATCH 1/6] list: introduce list_last_entry_or_null() Jeff Liu
2013-11-15 4:31 ` Jeff Liu
2013-11-15 4:31 ` Jeff Liu
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