linux-kernel - Re: [PATCH] coccinelle: api: detect duplicate chip data arrays

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Message-ID: <alpine.DEB.2.20.1710052116480.2626@hadrien>
Date:   Thu, 5 Oct 2017 21:19:16 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Joe Perches <joe@...ches.com>
cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Liam Breck <liam@...workimprov.net>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        Pali Rohár <pali.rohar@...il.com>,
        Linux PM mailing list <linux-pm@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Michal Marek <mmarek@...e.com>, cocci@...teme.lip6.fr,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kbuild test robot <fengguang.wu@...el.com>
Subject: Re: [PATCH] coccinelle: api: detect duplicate chip data arrays



On Thu, 5 Oct 2017, Joe Perches wrote:

> On Thu, 2017-10-05 at 21:13 +0200, Julia Lawall wrote:
> >
> > On Fri, 6 Oct 2017, Masahiro Yamada wrote:
> >
> > > 2017-10-01 21:42 GMT+09:00 Julia Lawall <Julia.Lawall@...6.fr>:
> > > > This semantic patch detects duplicate arrays declared using BQ27XXX_DATA
> > > > within a single structure.  It is currently specific to the file
> > > > drivers/power/supply/bq27xxx_battery.c.
> > > >
> > > > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> > > >
> > > > ---
> > >
> > > Applied to linux-kbuild/misc.
> >
> > Thanks for picking it up.
>
> If it is specific to one file, why not just run it
> and post the resultant patch?  Why have it in tree?

I guess that they anticipate that the data may change in the future?

If id-utils is used, Coccinelle will completely ignore files that don't
contain BQ27XXX_DATA, so the rule will have essentially no performance
impact.  If there is no indexing, it will only "grep" for BQ27XXX_DATA,
not actually parse the files that don't contain it.  So there is not much
performance impact even in that case.

julia