linux-kernel - Re: [PATCH] [sound/i2c/cs8427] Fix int to char conversion

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Date:   Thu, 18 Oct 2018 15:46:20 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Philipp Klocke" <philipp97kl@...il.com>
Cc:     <lukas.bulwahn@...il.com>, "Jaroslav Kysela" <perex@...ex.cz>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [sound/i2c/cs8427] Fix int to char conversion

On Thu, 18 Oct 2018 12:33:02 +0200,
Philipp Klocke wrote:
> 
> Compiling with clang yields the following warning:
> 
> sound/i2c/cs8427.c:140:31: warning: implicit conversion from 'int'
> to 'char' changes value from 160 to -96 [-Wconstant-conversion]
>     data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
>             ~ ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Because CS8427_REG_AUTOINC is defined as 128, it is too big for a
> char field.
> So change data from char to unsigned char, that it can hold the value.
> 
> This patch does not change the generated code.
> 
> Signed-off-by: Philipp Klocke <philipp97kl@...il.com>

Applied, thanks.

But at the next time, please put the relevant subsystem MLs to Cc,
and use the proper subject prefix (depending on the subsystem).


Takashi