linux-kernel - Re: [PATCH] misc: suppress build warning

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Message-ID: <20141204163032.GA29076@kroah.com>
Date:	Thu, 4 Dec 2014 08:30:32 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] misc: suppress build warning

On Thu, Dec 04, 2014 at 03:13:00PM +0000, Prabhakar Lad wrote:
> On Thu, Dec 4, 2014 at 2:59 PM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Thursday 04 December 2014 14:38:30 Lad, Prabhakar wrote:
> >> this patch fixes following build warning:
> >>
> >> drivers/misc/ioc4.c: In function ‘ioc4_probe’:
> >> drivers/misc/ioc4.c:194:16: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized]
> >>   period = (end - start) /
> >>                 ^
> >> drivers/misc/ioc4.c:148:11: note: ‘start’ was declared here
> >>   uint64_t start, end, period;
> >>
> >> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> >
> > Please explain why the compiler thinks there is a bug, why you
> > are sure that there isn't, and why you picked '0' as the
> > initialization value.
> >
> Its a false positive, to suppress the warning '0' was picked.

Are you _sure_ it's a false positive?  That odd do/while loop looks like
it might just not ever initialize the start variable, are you sure the
logic there is correct?

thanks,

greg k-h
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