linux-kernel - Re: [PATCH 00/18] use semicolons rather than commas to separate statements

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Message-ID: <alpine.DEB.2.22.394.2009291445050.2808@hadrien>
Date:   Tue, 29 Sep 2020 14:47:29 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Dan Carpenter <dan.carpenter@...cle.com>
cc:     Ard Biesheuvel <ardb@...nel.org>,
        Julia Lawall <Julia.Lawall@...ia.fr>,
        linux-iio@...r.kernel.org, drbd-dev@...n.linbit.com,
        Valdis Klētnieks <valdis.kletnieks@...edu>,
        David Lechner <david@...hnology.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-wireless@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-block@...r.kernel.org, linux-ide@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Joe Perches <joe@...ches.com>,
        linux-amlogic@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        openipmi-developer@...ts.sourceforge.net,
        linux-clk@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH 00/18] use semicolons rather than commas to separate
 statements



On Tue, 29 Sep 2020, Dan Carpenter wrote:

> On Tue, Sep 29, 2020 at 02:20:00PM +0200, Ard Biesheuvel wrote:
> > On Sun, 27 Sep 2020 at 21:56, Julia Lawall <Julia.Lawall@...ia.fr> wrote:
> > >
> > > These patches replace commas by semicolons.
> >
> >
> > Why?
> >
>
> In the best case, these commas are just uninitentional mess, like typing
> an extra space character or something.  I've looked at them before and
> one case I see where they are introduced is when people convert a
> struct initializer to code.
>
> -	struct foo {
> -		.a = 1,
> -		.b = 2,
>  		...
> +	foo.a = 1,
> +	foo.b = 2,
>
> The times where commas are used deliberately to replace curly braces are
> just evil.  Either way the code is cleaner with semi-colons.

I also found exaamples like the following to be particularly unforunate:

                                fprintf(stderr,
                                        "page_nr %lu wrong count %Lu %Lu\n",
                                       page_nr, count,
                                       count_verify[page_nr]), exit(1);

The exit is very hard to see, unless you know to look for it.

julia