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 13:23:33 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Amitoj Kaur Chawla <amitoj1606@...il.com>
Cc:	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

> +@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"?

3. Do you want to maintain a growing (?) function name list manually?

Regards,
Markus