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

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Date:   Fri, 19 Aug 2016 08:41:51 -0400 (EDT)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Amitoj Kaur Chawla <amitoj1606@...il.com>
cc:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Coccinelle <cocci@...teme.lip6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Julia Lawall <julia.lawall@...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 Fri, 19 Aug 2016, Amitoj Kaur Chawla wrote:

> On Mon, Aug 1, 2016 at 4:53 PM, SF Markus Elfring
> <elfring@...rs.sourceforge.net> 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?
> >
> > 2. How do you think about to extend the shown check list
> >    with the function "kvm_kvzalloc"?
> >
>
> Hi Markus,
>
> kvm_kvzalloc function doesn't fit the same pattern as the other
> functions in this semantic patch, and is kvm specific, so the
> semantic patch looks fine as is.

Acked-by: Julia Lawall <julia.lawall@...6.fr>

>
> Thanks,
> Amitoj
>
> > 3. Do you want to maintain a growing (?) function name list manually?
> >
> > Regards,
> > Markus
>