linux-kernel - Re:Re: [PATCH] sched/rt.c: use list_is_singular() instead of '->prev != ->next'

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Date:   Tue, 27 Oct 2020 10:07:47 +0800 (CST)
From:   苏辉 <sh_def@....com>
To:     "Steven Rostedt" <rostedt@...dmis.org>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH] sched/rt.c: use list_is_singular() instead of
 '->prev != ->next'

>Perhaps there should be a list_has_more_than_one() API, as list_is_singular
>requires two checks, and the "more_than_one" only requires a single check.
>
>list_is_singular() is:
>
>		return !list_empty(list) && (list->next == list->prev);
>
>
>which is more work than what you are replacing.
>

Hi, Steve:

Thanks for your explanation.
Maybe we should add another api called "list_more_than_one" just without
list_empty() check.

I will send PATCH V2 later.

Thank.