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

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Message-ID: <YzsUgY4CC0SH8Sl2@slm.duckdns.org>
Date:   Mon, 3 Oct 2022 06:57:37 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
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 Mon, Oct 03, 2022 at 12:55:24PM -0400, Waiman Long wrote:
> That was my original plan. However, after looking at some existing users of
> lockless list, they have coded in the dependency on the fact that a lockless
> list is empty if it is NULL. I guess I can make this true also for the new
> lockless list with sentinel at the expense of a bit more overhead in the
> entry insertion path and deletion path. I will take a further look at that.

There aren't that many users of llist. Maybe it'd be easier / cleaner to
introduce a macro to test whether a llist is empty and replace the NULL
tests?

Thanks.

-- 
tejun