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Subject[PATCH -mm 1/5] list.h: add list_singleton
Add list_singleton to check a list has just one entry.

list_singleton is useful to check whether a list_head which
have been temporarily allocated for listing objects can be
released or not.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
---
include/linux/list.h | 9 +++++++++
1 file changed, 9 insertions(+)

Index: 2.6.25-rc5-mm1/include/linux/list.h
===================================================================
--- 2.6.25-rc5-mm1.orig/include/linux/list.h
+++ 2.6.25-rc5-mm1/include/linux/list.h
@@ -211,6 +211,15 @@ static inline int list_empty_careful(con
return (next == head) && (next == head->prev);
}

+/**
+ * list_singleton - tests whether a list has just one entry.
+ * @head: the list to test.
+ */
+static inline int list_singleton(const struct list_head *head)
+{
+ return !list_empty(head) && (head->next == head->prev);
+}
+
static inline void __list_splice(struct list_head *list,
struct list_head *head)
{
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com







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