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Subject: Re: coccinelle: api/devm_platform_ioremap_resource: remove useless
 script
To:     Marc Zyngier <maz@kernel.org>, kernel-janitors@vger.kernel.org,
        Coccinelle <cocci@systeme.lip6.fr>
Cc:     Himanshu Jha <himanshujha199640@gmail.com>,
        Julia Lawall <julia.lawall@lip6.fr>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Gilles Muller <Gilles.Muller@lip6.fr>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linus Torvalds <torvalds@linuxfoundation.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Michal Marek <michal.lkml@markovi.net>,
        Nicolas Palix <nicolas.palix@imag.fr>,
        Thomas Gleixner <tglx@linutronix.de>,
        YueHaibing <yuehaibing@huawei.com>,
        LKML <linux-kernel@vger.kernel.org>
References: <e895d04ef5a282b5b48fcb21cbc175d2@www.loen.fr>
 <693a3b68-a0f1-81fe-40ce-2b6ba189450c@web.de> <868spgzcti.wl-maz@kernel.org>
From:   Markus Elfring <Markus.Elfring@web.de>
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Date:   Sun, 20 Oct 2019 07:45:50 +0200
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>>> I think part of the issue is that the script reports a WARNING

Would anybody like to change this category to =E2=80=9CINFO=E2=80=9D?


>> How much does this information influence really the stress tolerance
>> and change resistance (or acceptance) for the presented collateral evol=
ution?
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/=
scripts/coccinelle/api/devm_platform_ioremap_resource.cocci
>
> -ENOPARSE.

* Automated processes can trigger also big amounts of possible adjustments=
.

* The software development capacity will vary for affected components
  during the years.

* Implementing changes is a recurring project management task, isn't it?


>>> for something that is definitely correct code,
>>
>> Can related software improvement possibilities be taken into account
>> again under other circumstances?
>
> These patches provide no improvement whatsoever.

* Do you find information from the description of a corresponding
  commit 7945f929f1a77a1c8887a97ca07f87626858ff42
  ("drivers: provide devm_platform_ioremap_resource()") reasonable?
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/d=
rivers/base/platform.c

* How do you think about to compare any differences with
  software build results?


> As pointed out, they mostly introduce bugs.

Would you like to check any error statistics in more detail?


> Providing Coccinelle scripts that scream about perfectly valid code is p=
ointless,

They usually point opportunities out for further collateral evolution,
don't they?


> and the result is actively harmful.

You might not like some changes for a while.


> If said script was providing a correct semantic patch

I got the impression that this can also happen often enough.
Would you like to check the concrete transformation failure rate once more=
?


> instead of being an incentive for people to churn untested patches
> that span the whole tree, that'd be a different story.

Various developers got motivated to achieve something (possible improvemen=
ts?)
also by the means of available software analysis tools.
Mistakes can then happen as usual during such adjustment attempts.


> But that's not what this is about.

I guess that your software development concerns can be clarified a bit mor=
e.

Regards,
Markus