linux-kernel - Re: [PATCH] iio: light: isl29501: Simplify code to kill compiler warning

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Date:   Sun, 2 Sep 2018 11:48:57 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     jic23@...23.retrosnub.co.uk
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>, m.othacehe@...il.com,
        Arnd Bergmann <arnd@...db.de>, linux-iio@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: light: isl29501: Simplify code to kill compiler warning

Hi Jonathan,

On Sun, Sep 2, 2018 at 10:59 AM Jonathan Cameron
<jic23@...23.retrosnub.co.uk> wrote:
> On Sat, 25 Aug 2018 09:30:55 +0100
> Jonathan Cameron <jic23@...nel.org> wrote:
>
> > On Thu, 23 Aug 2018 23:24:35 +0200
> > Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> >
> > > With gcc 4.1.2:
> > >
> > >     drivers/iio/proximity/isl29501.c: In function ‘isl29501_register_write’:
> > >     drivers/iio/proximity/isl29501.c:235: warning: ‘msb’ may be used uninitialized in this function
> > >
> > > While this is a false positive, it can easily be avoided by removing the
> > > "msb" intermediate variable.
> > > Remove the "lsb" intermediate variable for consistency.
> > >
> > > Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> >
> > Looks sensible to me, but I'd obviously like to leave a little time for
> > Mathieu to comment as it's his driver.
> Long enough. I guess Mathieu is busy so I'll apply this (mostly before
> it goes so far back in my email that I loose it)
>
> Applied to the togreg branch of iio.git and pushed out as testing for
> the autobuilders to play with it.  I thought about marking for stable
> to reduce noise but decided that compiler is old enough (and I've not
> seen it with GCC 8 IIRC) that I wouldn't bother.

Thanks!

> Basically I'm taking this on the merits of it being better code rather
> than the warning fix :)

JFTR: I only send patches for these warnings if they (a) fix a real bug, or (b)
improve the code.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds