linux-kernel - Re: [v2] Documentation: Coccinelle: fix typos and command example

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Message-ID: <33b47421-5966-2b5a-17ec-d55a1169d30b@web.de>
Date:   Thu, 2 Jul 2020 08:01:59 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Julia Lawall <julia.lawall@...ia.fr>,
        Randy Dunlap <rdunlap@...radead.org>,
        Coccinelle <cocci@...teme.lip6.fr>, linux-doc@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>
Subject: Re: [v2] Documentation: Coccinelle: fix typos and command example

>>> Julia, Markus- can you tell me how to run coccicheck on one source file?
>>
>> You can choose between two methods.
>>
>> * Use the documented build target with appropriate parameters.
>>   (How many Linux software modules do consist of only a single source file?)
>
> This is a useless piece of information.  What are "appropriate parameters".

I propose to take another look at details from the discussed software documentation
for the desired selection of useful settings.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/dev-tools/coccinelle.rst?id=cd77006e01b3198c75fb7819b3d0ff89709539bb#n167

It is mentioned there that the make variable “M” can be used
to apply Coccinelle to a specific directory.

* Which existing directories will contain a single source file for a while?

* You can create folders on demand with one source file (or equivalent
  symbolic links), can't you?

>> * Do you get further ideas from another concrete command example?
>>   https://lore.kernel.org/linux-arm-kernel/5b693ee0-0cb1-7ff3-b562-bac6bcb6aae8@web.de/
>>   https://lkml.org/lkml/2020/6/29/357
>>
>>   elfring@...ne:~/Projekte/Linux/next-patched> make J=1 C=1 CHECK='scripts/coccicheck' MODE=context COCCI=~/Projekte/Linux/next-patched/scripts/coccinelle/null/show_pointer_usage_before_null_check-20200701.cocci drivers/usb/mtu3/mtu3_gadget.o
>
> This is not what is intended.

I am curious how corresponding intentions will be adjusted.

> What is intended has never worked.

I wonder about this view.
Did I get inappropriate impressions from the presented test example?

> The coccicheck script expects that the file name is received on its command
> line, and that is not the case.  I have asked the person who wrote the
> code if he knows how to fix it.

I am also curious how this area might evolve further.

Regards,
Markus