linux-kernel - Re: x86-ksysfs: Use kmalloc_array() in create_setup_data

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Message-ID: <07f2cb49-662f-590f-acf6-686f8432015d@users.sourceforge.net>
Date:   Wed, 7 Sep 2016 13:45:56 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Kees Cook <keescook@...omium.org>, Ingo Molnar <mingo@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>, Dave Young <dyoung@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Matt Fleming <matt.fleming@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: x86-ksysfs: Use kmalloc_array() in create_setup_data_nodes()

>> Would the following script (for the semantic patch language)
>> be useful enough for further development considerations?
>>
>> usage_of_kmalloc_array1-excerpt2.cocci:
>> @replacement2@
>> expression count, pointer, target;
>> @@
>>  target =
>> -         kmalloc(sizeof(*pointer) * (count)
>> +         kmalloc_array(count, sizeof(*pointer)
>>                         , ...);
> 
> Why don't you include the _exact_ script that you run?

I showed only the "excerpt" above because of the current situation
that this single SmPL rule triggered the software change
which I suggested for the referenced source file.

How do you think about to try a command out like the following
also in your development (or test) environment?

elfring@...ne:~/Projekte/Linux/next-patched> spatch.opt ~/Projekte/Coccinelle/janitor/usage_of_kmalloc_array1-excerpt2.cocci arch/x86/kernel/ksysfs.c


Regards,
Markus