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Date: Fri, 15 Nov 2013 12:31:15 +0800 From: Jeff Liu <jeff.liu@...cle.com> To: linux-kernel@...r.kernel.org CC: akpm@...ux-foundation.org, "xfs@....sgi.com" <xfs@....sgi.com>, cluster-devel@...hat.com, linux-mtd@...ts.infradead.org, jfs-discussion@...ts.sourceforge.net, oleg@...hat.com, jiri@...nulli.us, gregkh@...uxfoundation.org Subject: [PATCH 1/6] list: introduce list_last_entry_or_null() From: Jie Liu <jeff.liu@...cle.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@...cle.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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