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

[Song Chen]

Hi,

On 4/16/26 20:30, David Laight wrote:
> On Wed, 15 Apr 2026 15:01:37 +0800
> chensong_2000@xxxxxx wrote:
>
> > From: Song Chen <chensong_2000@xxxxxx>
> >
> > 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

Sorry, i don't follow, the notifiers in the list are deleted when 
calling notifier_chain_unregister, other than that, they are traversed 
forward and backward.

Song