linux-kernel - Re: [Cocci] coccinelle: Convert comma to semicolons (was Re: [PATCH] checkpatch: Add test for comma use that should be semicolon)

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Message-ID: <alpine.DEB.2.22.394.2009251904540.2772@hadrien>
Date:   Fri, 25 Sep 2020 19:06:20 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Joe Perches <joe@...ches.com>
cc:     Thomas Gleixner <tglx@...utronix.de>,
        Valdis Klētnieks <valdis.kletnieks@...edu>,
        kernel-janitors <kernel-janitors@...r.kernel.org>,
        kernelnewbies <kernelnewbies@...nelnewbies.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        cocci <cocci@...teme.lip6.fr>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Whitcroft <apw@...dowen.org>
Subject: Re: [Cocci] coccinelle: Convert comma to semicolons (was Re: [PATCH]
 checkpatch: Add test for comma use that should be semicolon)



On Thu, 24 Sep 2020, Joe Perches wrote:

> On Thu, 2020-09-24 at 23:53 +0200, Thomas Gleixner wrote:
> > On Thu, Sep 24 2020 at 13:33, Joe Perches wrote:
> > > On Thu, 2020-09-24 at 22:19 +0200, Thomas Gleixner wrote:
> > > > On Sat, Aug 22 2020 at 09:07, Julia Lawall wrote:
> > > > > On Fri, 21 Aug 2020, Joe Perches wrote:
> > > > > > True enough for a general statement, though the coccinelle
> > > > > > script Julia provided does not change a single instance of
> > > > > > for loop expressions with commas.
> > > > > >
> > > > > > As far as I can tell, no logic defect is introduced by the
> > > > > > script at all.
> > > > >
> > > > > The script has a rule to ensure that what is changed is part of a top
> > > > > level statement that has the form e1, e2;.  I put that in to avoid
> > > > > transforming cases where the comma is the body of a macro, but it protects
> > > > > against for loop headers as well.
> > > >
> > > > Right. I went through the lot and did not find something dodgy. Except
> > > > for two hunks this still applies. Can someone please send a proper patch
> > > > with changelog/SOB etc. for this?
> > >
> > > Treewide?
> > >
> > > Somebody no doubt would complain, but there
> > > _really should_ be some mechanism for these
> > > trivial and correct treewide changes...
> >
> > There are lots of mechanisms:
>
> I've tried them all.
>
> None of them work particularly well,
> especially the individual patch route.
>
> >  - Andrew picks such changes up
>
> Generally not treewide.
>
> >  - With a few competent eyeballs on it (reviewers) this can go thorugh
> >    the trivial tree as well. It's more than obvious after all.
>
> Jiri is almost non-existent when it comes to
> trivial treewide patches.
>
> >  - Send the script to Linus with a proper change log attached and ask
> >    him to run it.
>
> Linus has concerns about backports and what he
> deems trivialities.  Generally overblown IMO.
>
> >  - In the worst case if nobody feels responsible, I'll take care.
>
> If Julia doesn't send a new patch in the next few
> days, I will do the apply, fixup and resend of hers.
>
> So, you're on-deck, nearly up...
>
> > All of the above is better than trying to get the attention of a
> > gazillion of maintainters.
>
> True.
>
> And all of the treewide changes depend on some
> generic acceptance of value in the type of change.
>
> Some believe that comma->semicolon conversions
> aren't useful as there isn't a logical change and
> the compiler output wouldn't be different.

I have a script that will cut up the patches and send them to the
appropriate maintainers, so I have no problem with that route.

julia