linux-kernel - Re: [PATCH] kcsan: Use min() to fix Coccinelle warning

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Date: Mon, 24 Jun 2024 01:00:15 -0700
From: Thorsten Blum <thorsten.blum@...lux.com>
To: Marco Elver <elver@...gle.com>
Cc: dvyukov@...gle.com,
 kasan-dev@...glegroups.com,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kcsan: Use min() to fix Coccinelle warning

On 24. Jun 2024, at 00:02, Marco Elver <elver@...gle.com> wrote:
> On Mon, 24 Jun 2024 at 00:08, Thorsten Blum <thorsten.blum@...lux.com> wrote:
>> 
>> Fixes the following Coccinelle/coccicheck warning reported by
>> minmax.cocci:
>> 
>>        WARNING opportunity for min()
>> 
>> Use size_t instead of int for the result of min().
>> 
>> Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
> 
> Reviewed-by: Marco Elver <elver@...gle.com>
> 
> Thanks for polishing (but see below). Please compile-test with
> CONFIG_KCSAN=y if you haven't.

Yes, I compile-tested it with CONFIG_KCSAN=y, but forgot to mention it.

> While we're here polishing things this could be:
> 
> const size_t read_len = min(count, sizeof(kbuf) - 1);
> 
> ( +const, remove redundant () )

Should I submit a v2 or are you adding this already?

Thanks,
Thorsten