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

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Date:   Mon, 3 Oct 2022 13:40:05 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ming Lei <ming.lei@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Koutný <mkoutny@...e.com>
Subject: Re: [PATCH v7 1/3] llist: Add a lock-less list variant terminated by
 a sentinel node


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