Re: [RFC PATCH 1/2] kernel/notifier: replace single-linked list with double-linked list for reverse traversal

David Laight
2026-04-16T12:30:08Z

On Wed, 15 Apr 2026 15:01:37 +0800
chensong_2000@189.cn wrote:

> From: Song Chen <chensong_2000@189.cn>
>
> The current notifier chain implementation uses a single-linked list
> (struct notifier_block *next), which only supports forward traversal
> in priority order. This makes it difficult to handle cleanup/teardown
> scenarios that require notifiers to be called in reverse priority order.

If it is only cleanup/teardown then the list can be order-reversed
as part of that process at the same time as the list is deleted.

David