linux-kernel - Re: [PATCH v3] Input: mousedev - fix implicit conversion warning

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Message-ID: <20170530024413.GB32841@dtor-ws>
Date:   Mon, 29 May 2017 19:44:13 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Nick Desaulniers <nick.desaulniers@...il.com>
Cc:     gregkh@...uxfoundation.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Input: mousedev - fix implicit conversion warning

On Mon, May 29, 2017 at 12:22:52PM -0700, Nick Desaulniers wrote:
> On Fri, May 26, 2017 at 10:07:46AM -0700, Dmitry Torokhov wrote:
> > If you look at the code of this fucntion we really use ps2_data as
> > signed in calculations, and this change would break that. While making
> > ps2_data u8 might be beneficial we'd need to rework mousedev_packet() to
> > use signed temporaries for dx, dy and dz before stufifng them into
> > ps2_data.
> 
> Is your recommendation then to stick with the simple cast as in V1 of
> this patch, or stick with u8 and rework mousedev_packet()?

I think casts are often mysterious, so, unless we'll end up with worse
object code, I'd switch to u8 and temps.

-- 
Dmitry