linux-kernel - Re: [PATCH v2] wifi: wilc1000: use vmm

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Message-ID: <bd234d26-f418-4ff7-b6a2-9a81526aa61a@bootlin.com>
Date:   Tue, 17 Oct 2023 10:28:19 +0200
From:   Alexis Lothoré <alexis.lothore@...tlin.com>
To:     Jeff Johnson <quic_jjohnson@...cinc.com>,
        Claudiu Beznea <claudiu.beznea@...on.dev>,
        Kalle Valo <kvalo@...nel.org>,
        Michael Walle <mwalle@...nel.org>
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Ajay Singh <ajay.kathat@...rochip.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2] wifi: wilc1000: use vmm_table as array in wilc struct

On 10/17/23 00:51, Jeff Johnson wrote:
> On 10/16/2023 2:23 PM, Alexis Lothoré wrote:
>> Hello Jeff,
>>
>> On 10/16/23 17:26, Jeff Johnson wrote:
>>> On 10/16/2023 1:29 AM, Alexis Lothoré wrote:
>>> this is probably OK since the values are constant, but kcalloc() is generally
>>> preferred
>>
>> Ok, I can submit a new version with kcalloc. One thing that I do not understand
>> however is why checkpatch.pl remains silent on this one. I guess it should raise
>> the ALLOC_WITH_MULTIPLY warning here. I tried to dive into the script to
>> understand why, but I drowned in regexes (and Perl, with which I am not familiar
>> with). Could it be because of both sides being constant ?
> 
> I also drown when looking at checkpatch.pl -- so many "write-only" regexes! But
> I think the following is what excludes your patch:
> $r1 =~ /^[A-Z_][A-Z0-9_]*$
> 
> It is a compile-time constant so the compiler can flag on overflow, so it's your
> call to modify or not.

Thanks for taking a look. I have tried to tweak those lines to see if it makes
checkpatch raise the warning, without success.

Anyway, I agree with your initial statement, let's keep the code base
homogeneous and replace kzalloc with kcalloc

> /jeff

-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com