linux-kernel - Re: [PATCH] coccinelle: api/devm_platform_ioremap

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Date:   Sat, 19 Oct 2019 14:09:41 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Markus Elfring <Markus.Elfring@....de>
Cc:     Julia Lawall <Julia.Lawall@...6.fr>,
        Himanshu Jha <himanshujha199640@...il.com>,
        kernel-janitors@...r.kernel.org,
        Coccinelle <cocci@...teme.lip6.fr>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>
Subject: Re: [PATCH] coccinelle: api/devm_platform_ioremap_resource: remove
 useless script

On 19/10/2019 11:00:47+0200, Markus Elfring wrote:
> > While it is useful for new drivers to use devm_platform_ioremap_resource,
> 
> This is nice.
> 
> 
> > this script is currently used to spam maintainers,
> 
> This view is unfortunate.
> 
> Do we stumble on a target conflict again?
> 
> 
> > often updating very old drivers.
> 
> This can also happen.
> 
> 
> > The net benefit is the removal of 2 lines of code in the driver
> 
> Additional effects can be reconsidered, can't they?
> 

What are the additional effects? What is the end goal of converting all
the existing drivers to devm_platform_ioremap_resource? The existing
code is currently always correct and it is difficult to see how this
would lead to any bug avoidance in the long term.

> > but the review load for the maintainers is huge.
> 
> Does collateral evolution trigger a remarkable amount of changes occasionally?
> 

This is not an evolution, it is unnecessary churn. Those patches have no
benefit and eat up very valuable reviewer time.

> 
> How will such feedback influence the development and integration of
> further scripts for the semantic patch language (Coccinelle software)?
> 

There are a few other scripts that have no added value when applied to
existing code, like ptr_ret.cocci.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com