linux-kernel - Re: [PATCH] coccinelle: semantic patch to check for inappropriate do

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Date:   Sun, 5 Jan 2020 11:33:41 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     Wen Yang <wenyang@...ux.alibaba.com>, cocci@...teme.lip6.fr,
        kernel-janitors@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Matthias Männich <maennich@...gle.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] coccinelle: semantic patch to check for inappropriate
 do_div() calls

> +virtual context
> +virtual org
> +virtual report

The operation mode “patch” is not supported here.
Should the term “semantic code search” be used instead in the subject again?


> +@@
> +(
> +* do_div(f, l);
> +|
> +* do_div(f, ul);
> +|
> +* do_div(f, ul64);
> +|
> +* do_div(f, sl64);
> +)

I suggest to avoid the specification of duplicate SmPL code.

+@@
+*do_div(f, \( l \| ul \| ul64 \| sl64 \) );


Will any more case distinctions become helpful?


> +@...ipt:python depends on report@
> +p << r.p;
> +@@
> +
> +msg="WARNING: WARNING: do_div() does a 64-by-32 division, which may truncation the divisor to 32-bit"
> +coccilib.report.print_report(p[0], msg)

Please improve the message construction.

Regards,
Markus