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

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Message-ID: <0dbd2dd6-4c68-1f7c-1500-9e5d40047813@users.sourceforge.net>
Date:	Mon, 1 Aug 2016 13:56:58 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Julia Lawall <julia.lawall@...6.fr>,
	Amitoj Kaur Chawla <amitoj1606@...il.com>
Cc:	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

>> 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.

How do you think about the following SmPL script example?

@vz_combined
 depends on patch && !context && !org && !report@
type T;
T* pointer;
+statement S;
expression express;
@@
 pointer =
-          vmalloc
+          vzalloc
           (...);
 if (!d)
    S
-memset(d, 0, sizeof(
(
-T
|
-*(express)
)
-));


> Perhaps in performance as well.

I admit that I am unsure about the run-time characteristics
for my suggestion.

Regards,
Markus