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list.h: add list_is_singular()

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Add list_is_singular() to check a list has just one entry.

list_is_singular() 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>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Masami Hiramatsu 2008-04-28 02:14:27 -07:00 committed by Linus Torvalds
parent 3d8d996e0c
commit 9960257281
1 changed files with 9 additions and 0 deletions
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9
include/linux/list.h
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@ -319,6 +319,15 @@ static inline int list_empty_careful(const struct list_head *head)
return (next == head) && (next == head->prev);
}
/**
* list_is_singular - tests whether a list has just one entry.
* @head: the list to test.
*/
static inline int list_is_singular(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)
{