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

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Date:   Sun, 25 Aug 2019 17:30:57 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Denis Efremov <efremov@...ux.com>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Julia Lawall <julia.lawall@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>, cocci@...teme.lip6.fr
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts: coccinelle: check for !(un)?likely usage

> +(
> +* !likely(E)
> +|
> +* !unlikely(E)
> +)

Can the following code variant be nicer?

+*! \( likely \| unlikely \) (E)


> +(
> +-!likely(E)
> ++unlikely(E)
> +|
> +-!unlikely(E)
> ++likely(E)
> +)

I would find the following SmPL change specification more succinct.

+(
+-!likely
++unlikely
+|
+-!unlikely
++likely
+)(E)


> +coccilib.org.print_todo(p[0], "WARNING use unlikely instead of !likely")
…
> +msg="WARNING: Use unlikely instead of !likely"
> +coccilib.report.print_report(p[0], msg)

1. I find such a message construction nicer without the extra variable “msg”.

2. I recommend to make the provided information unique.
   * How do you think about to split the SmPL disjunction in the rule “r”
     for this purpose?

   * Should the transformation become clearer?

Regards,
Markus