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

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Date:   Tue, 15 Dec 2020 09:52:36 +0100 (CET)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Maxime Ripard <maxime@...no.tech>
cc:     Wolfram Sang <wsa@...-dreams.de>, michal.lkml@...kovi.net,
        Gilles.Muller@...6.fr, Mark Brown <broonie@...nel.org>,
        nicolas.palix@...g.fr, linux-kernel@...r.kernel.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Thierry Reding <thierry.reding@...il.com>,
        cocci@...teme.lip6.fr
Subject: Re: [Cocci] [PATCH] coccinnelle: Remove ptr_ret script



On Tue, 15 Dec 2020, Maxime Ripard wrote:

> Hi,
>
> On Tue, Jan 07, 2020 at 11:29:54AM +0100, Wolfram Sang wrote:
> > 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>
>
> It looks like this patch was never applied, whose tree should it go
> through?

Sorry.  I can take it.  I'm not sure that I still have the original
message, though.  If you have it handy, that would be helpful.

julia