Re: [PATCH v7 1/3] llist: Add a lock-less list variant terminated by a sentinel node

[Waiman Long]

On 10/3/22 13:36, Tejun Heo wrote:
> Hello,
>
> On Mon, Oct 03, 2022 at 01:32:49PM -0400, Waiman Long wrote:
> > What my current thinking is to make llist works with both NULL and sentinel
> > terminated lockless list. Users who wish to use the sentinel terminated
> > version will have to use special sentinel version of LLIST_HEAD() macro and
> > llist_del_all() and __llist_del_all() functions. In this way, I don't need
> > to touch an existing users of llist while minimizing code redundancy. What
> > do you think?
> Wouldn't that be more error-prone in the long term? I'd just bite the bullet
> and convert the empty tests. It is a hassle to find them but given that it's
> just the head node testing, it hopefully wouldn't be too bad.

OK, I will take a further look at what changes will be needed by the 
existing llist users.

Thanks,
Longman