linux-kernel - Re: [PATCH v3 4/7] staging: vt6655: Replace VNSvOutPortB with iowrite8

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Date:   Tue, 12 Apr 2022 08:45:53 +0200
From:   Philipp Hortmann <philipp.g.hortmann@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Forest Bond <forest@...ttletooquiet.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/7] staging: vt6655: Replace VNSvOutPortB with
 iowrite8

On 4/12/22 08:37, Dan Carpenter wrote:
> On Mon, Apr 11, 2022 at 10:49:39PM +0200, Philipp Hortmann wrote:
>> Replace macro VNSvOutPortB with iowrite8.
>> The name of macro and the arguments use CamelCase which
>> is not accepted by checkpatch.pl
>>
>> For constants from 0 to below 0x80 the u8 cast was omitted.
>> For variables which are defined as unsigned char the u8 is omitted.
> I hate that GCC prints warnings for this.  Useless.  Horrible.  But I
> understand that GCC does and we haven't figured out how to disable it
> or who needs to approve that.
> 
> But even then I still don't understand the casting in this patch.
> 
> Shouldn't the rule be to do the minimum work arounds to silence GCC?
> My understand is that the the casting is only needed when you're dealing
> with a bitwise negated constant.  These are macros so the parameters
> might be constant so basically any bitwise negate gets a cast.
> 

Please send me the compiler flags you are using.
I was using:
make "KCFLAGS=-pipe -Wall" -C . M=drivers/staging/vt6655/
But of course more flags are set.
I did not see any compiler warnings.

Thanks

Regards,
Philipp Hortmann