linux-kernel - Re: [PATCH 1/1] platform: x86: Deletion of checks before backlight_device

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Date:	Thu, 27 Nov 2014 19:13:10 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:	Anisse Astier <anisse@...ier.eu>,
	Corentin Chary <corentin.chary@...il.com>,
	Darren Hart <dvhart@...radead.org>,
	Ike Panhc <ike.pan@...onical.com>,
	Jonathan Woithe <jwoithe@...t42.net>,
	Mattia Dongili <malattia@...ux.it>,
	platform-driver-x86@...r.kernel.org,
	acpi4asus-user@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 1/1] platform: x86: Deletion of checks before
 backlight_device_unregister()



On Mon, 24 Nov 2014, SF Markus Elfring wrote:

> >> This issue was detected by using the Coccinelle software.
> >
> > What script was used ?
>
> A semantic patch approach which I published on the mailing lists in March
> is in action on my software development system for a while.
>
>
> > Is it in scripts/coccinelle ?
>
> Not yet.
>
> I hope that the involved update suggestions got sufficient positive feedback
> to integrate five scripts there.

The current scripts are very complicated, involving the interaction
between multiple scripts and a database, and I think they are not very
suitable for make coccicheck.  Also, the idea of removing the null checks
is not appropriate in all contexts.  Perhaps it could be possible to add
a script to the Linux kernel that handles a number of common cases for
which removing the null test is widely considered to be desirable.

julia
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