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

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Message-ID: <alpine.DEB.2.21.2001091304310.10786@hadrien>
Date:   Thu, 9 Jan 2020 13:04:48 +0100 (CET)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Markus Elfring <Markus.Elfring@....de>
cc:     Wen Yang <wenyang@...ux.alibaba.com>, cocci@...teme.lip6.fr,
        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



On Thu, 9 Jan 2020, Markus Elfring wrote:

> >> Thus I suggest now to split the source code search pattern into
> >> four separate rules.
> >
> > Why?
>
> 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.

julia