Messages in this thread Patch in this message | | | From | NeilBrown <> | Date | Mon, 30 Apr 2018 14:31:30 +1000 | Subject | [PATCH 3/4] rculist: add list_for_each_entry_from_rcu() |
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list_for_each_entry_from_rcu() is an RCU version of list_for_each_entry_from(). It walks a linked list under rcu protection, from a given start point.
It is similar to list_for_each_entry_continue_rcu() but starts *at* the given position rather than *after* it.
Naturally, the start point must be known to be in the list.
Signed-off-by: NeilBrown <neilb@suse.com> --- include/linux/rculist.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/include/linux/rculist.h b/include/linux/rculist.h index 127f534fec94..36df6ccbc874 100644 --- a/include/linux/rculist.h +++ b/include/linux/rculist.h @@ -403,6 +403,19 @@ static inline void list_splice_tail_init_rcu(struct list_head *list, &pos->member != (head); \ pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) +/** + * list_for_each_entry_from_rcu - iterate over a list from current point + * @pos: the type * to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the list_node within the struct. + * + * Iterate over the tail of a list starting from a given position, + * which must have been in the list when the RCU read lock was taken. + */ +#define list_for_each_entry_from_rcu(pos, head, member) \ + for (; &(pos)->member != (head); \ + pos = list_entry_rcu(pos->member.next, typeof(*(pos)), member)) + /** * hlist_del_rcu - deletes entry from hash list without re-initialization * @n: the element to delete from the hash list.
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