linux-kernel - Re: spi: cadence-xspi: Drop useless assignment to NULL

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Message-ID: <20231121075716.it3cpwhwymkaqjrh@pengutronix.de>
Date:   Tue, 21 Nov 2023 08:57:16 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Markus Elfring <Markus.Elfring@....de>
Cc:     Amit Dhingra <mechanicalamit@...il.com>, kernel@...gutronix.de,
        kernel-janitors@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, cocci@...ia.fr,
        linux-spi@...r.kernel.org
Subject: Re: spi: cadence-xspi: Drop useless assignment to NULL

On Tue, Nov 21, 2023 at 08:34:35AM +0100, Markus Elfring wrote:
> >>> Static structs are initialized with zeros for unspecified fields.
> >>> So there is no advantage to explicitly initialize .remove with NULL
> >>> and the assignment can be dropped without side effects.
> >>
> >> Would you become interested to delete redundant initialisation repetitions
> >> at any more source code places?
> >>
> >> A corresponding script for the semantic patch language (Coccinelle software)
> >> can point more remaining update candidates out for various components.
> >
> > Coccinelle shows 471 files.
> 
> I got the impression that more source code places can be reconsidered accordingly.
> 
> @deletion@
> identifier member, s, var;
> @@
>  static struct s var =
>  {
>  ...,
> -.member = \( 0 \| NULL \) ,
>  ...
>  };
> 
> 
> Markus_Elfring@...ne:…/Projekte/Linux/next-analyses> rg '^-\s' …/Projekte/Bau/Linux/scripts/Coccinelle/delete_NULL_assignment_in_static_struct-20231117.diff | wc -l
> 6567

Removing = 0 assignments should be carefully reviewed. I skimmed the
changes to drivers/pwm and would oppose to both changes. Even for my
patch I wasn't sure if it's a good idea and talked to Mark before
sending it.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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