linux-kernel - Re: [v2] coccinelle: semantic patch to check for inappropriate do

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Date:   Thu, 9 Jan 2020 13:14:45 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     Julia Lawall <julia.lawall@...ia.fr>,
        Wen Yang <wenyang@...ux.alibaba.com>, cocci@...teme.lip6.fr
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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: [v2] coccinelle: semantic patch to check for inappropriate
 do_div() calls

>> Does the Coccinelle software ensure that a variable like “r.ul” contains
>> really useful data even if the expected branch of the SmPL disjunction
>> was occasionally not matched?
>
> The python code will only be executed if it does.

The Python scripts will be executed if the SmPL rule “r” found something.
I suggest to take a closer look at the involved data types for
really safe case distinctions.
Does the dependency management around the application of SmPL disjunctions
need any further clarification?

Regards,
Markus