linux-kernel - [PATCH -mm 1/5] list.h: add list

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Date:	Fri, 14 Mar 2008 16:40:36 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	Prasanna S Panchamukhi <prasanna@...ibm.com>,
	Shaohua Li <shaohua.li@...el.com>,
	David Miller <davem@...emloft.net>,
	"Frank Ch. Eigler" <fche@...hat.com>
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@...hat.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@...hat.com





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