linux-kernel - Re: [PATCH v2] scripts: coccinelle: check for !(un)?likely usage

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Message-ID: <alpine.DEB.2.21.1908300842060.2184@hadrien>
Date:   Fri, 30 Aug 2019 08:42:34 +0800 (CST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Denis Efremov <efremov@...ux.com>
cc:     linux-kernel@...r.kernel.org, cocci@...teme.lip6.fr,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Michal Marek <michal.lkml@...kovi.net>,
        Markus Elfring <Markus.Elfring@....de>,
        Joe Perches <joe@...ches.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v2] scripts: coccinelle: check for !(un)?likely usage



On Thu, 29 Aug 2019, Denis Efremov wrote:

> On 8/29/19 8:10 PM, Denis Efremov wrote:
> > This patch adds coccinelle script for detecting !likely and
> > !unlikely usage. These notations are confusing. It's better
> > to replace !likely(x) with unlikely(!x) and !unlikely(x) with
> > likely(!x) for readability.
>
> I'm not sure that this rule deserves the acceptance.
> Just to want to be sure that "!unlikely(x)" and "!likely(x)"
> are hard-readable is not only my perception and that they
> become more clear in form "likely(!x)" and "unlikely(!x)" too.

Is likely/unlikely even useful for anything once it is a subexpression?

julia