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llists: move llist_reverse_order from raid5 to llist.c

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Make this useful helper available for other users.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Neil Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Hellwig 2013-11-14 14:32:11 -08:00 • committed by Linus Torvalds
commit b89241e8cd
3 changed files with 24 additions and 14 deletions
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22
lib/llist.c
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@ -81,3 +81,25 @@ struct llist_node *llist_del_first(struct llist_head *head)
return entry;
}
EXPORT_SYMBOL_GPL(llist_del_first);
/**
* llist_reverse_order - reverse order of a llist chain
* @head: first item of the list to be reversed
*
* Reverse the oder of a chain of llist entries and return the
* new first entry.
*/
struct llist_node *llist_reverse_order(struct llist_node *head)
{
struct llist_node *new_head = NULL;
while (head) {
struct llist_node *tmp = head;
head = head->next;
tmp->next = new_head;
new_head = tmp;
}
return new_head;
}
EXPORT_SYMBOL_GPL(llist_reverse_order);