linux-kernel - Re: [Cocci] [PATCH v3] Coccinelle: Script to replace allocate and memset with zalloc functions

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Date:	Mon, 1 Aug 2016 13:37:36 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:	Amitoj Kaur Chawla <amitoj1606@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Coccinelle <cocci@...teme.lip6.fr>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Michal Marek <mmarek@...e.com>,
	Nicolas Palix <nicolas.palix@...g.fr>
Subject: Re: [Cocci] [PATCH v3] Coccinelle: Script to replace allocate and
 memset with zalloc functions



On Mon, 1 Aug 2016, SF Markus Elfring wrote:

> > +@vz1 depends on patch && !context && !org && !report@
> > +type T;
> > +T *d;
> > +statement S;
> > +@@
> > +
> > +        d =
> > +-            vmalloc
> > ++            vzalloc
> > +             (...);
> > +        if (!d) S
> > +-       memset(d, 0, sizeof(T));
> > +
> > +@vz2 depends on patch && !context && !org && !report@
> > +expression d;
> > +statement S;
> > +@@
> > +
> > +        d =
> > +-            vmalloc
> > ++            vzalloc
> > +             (...);
> > +        if (!d) S
> > +-       memset(d, 0, sizeof(*d));
>
> I suggest to take another look at a few implementation details.
>
> 1. Would it make sense to merge such SmPL rules into one
>    so that code duplication could be reduced a bit
>    in such a script?

I think it would suffer in readability. Perhaps in performance as well.

julia


>
> 2. How do you think about to extend the shown check list
>    with the function "kvm_kvzalloc"?
>
> 3. Do you want to maintain a growing (?) function name list manually?
>
> Regards,
> Markus
>