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| author | Jiri Pirko <jiri@resnulli.us> | 2013-05-29 05:02:56 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-05-31 17:31:52 -0700 |
| commit | 6d7581e62f8be462440d7b22c6361f7c9fa4902b (patch) | |
| tree | 0f85824301b8a252ffe5a4e88288191c46cd98b2 /include/linux/list.h | |
| parent | e4e8536f65b51ce91c30588b0925872bdfc60d03 (diff) | |
| download | linux-rt-6d7581e62f8be462440d7b22c6361f7c9fa4902b.tar.gz | |
list: introduce list_first_entry_or_null
non-rcu variant of list_first_or_null_rcu
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/list.h')
| -rw-r--r-- | include/linux/list.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h index 6a1f8df9144b..b83e5657365a 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -362,6 +362,17 @@ static inline void list_splice_tail_init(struct list_head *list, list_entry((ptr)->next, type, member) /** + * list_first_entry_or_null - get the first 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_first_entry_or_null(ptr, type, member) \ + (!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL) + +/** * list_for_each - iterate over a list * @pos: the &struct list_head to use as a loop cursor. * @head: the head for your list. |