linux-kernel - Re: [Cocci] [PATCH] coccinnelle: Remove ptr

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Message-ID: <20200107102954.GB1135@ninjato>
Date:   Tue, 7 Jan 2020 11:29:54 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     Maxime Ripard <maxime@...no.tech>, michal.lkml@...kovi.net,
        Gilles.Muller@...6.fr, Tomi Valkeinen <tomi.valkeinen@...com>,
        Mark Brown <broonie@...nel.org>, nicolas.palix@...g.fr,
        linux-kernel@...r.kernel.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Julia.Lawall@...6.fr, Thierry Reding <thierry.reding@...il.com>,
        cocci@...teme.lip6.fr
Subject: Re: [Cocci] [PATCH] coccinnelle: Remove ptr_ret script

On Tue, Jan 07, 2020 at 11:06:56AM +0100, Julia Lawall wrote:
> 
> 
> On Tue, 7 Jan 2020, Maxime Ripard wrote:
> 
> > The ptr_ret script script addresses a number of situations where we end up
> > testing an error pointer, and if it's an error returning it, or return 0
> > otherwise to transform it into a PTR_ERR_OR_ZERO call.
> >
> > So it will convert a block like this:
> >
> > if (IS_ERR(err))
> >     return PTR_ERR(err);
> >
> > return 0;
> >
> > into
> >
> > return PTR_ERR_OR_ZERO(err);
> >
> > While this is technically correct, it has a number of drawbacks. First, it
> > merges the error and success path, which will make it harder for a reviewer
> > or reader to grasp.
> >
> > It's also more difficult to extend if we were to add some code between the
> > error check and the function return, making the author essentially revert
> > that patch before adding new lines, while it would have been a trivial
> > addition otherwise for the rewiever.
> >
> > Therefore, since that script is only about cosmetic in the first place,
> > let's remove it since it's not worth it.
> >
> > Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> > Cc: Thierry Reding <thierry.reding@...il.com>
> > Cc: Tomi Valkeinen <tomi.valkeinen@...com>
> > Cc: Mark Brown <broonie@...nel.org>
> > Signed-off-by: Maxime Ripard <maxime@...no.tech>
> 
> Acked-by: Julia Lawall <julia.lawall@...ia.fr>

Convincing patch description, good catch!

Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>


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