linux-kernel - RE: [PATCH v2] staging/comedi/dt282x: avoid integer overflow warning

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Message-ID: <BN3PR0101MB1057371F36F9CF11BD0CC706D08B0@BN3PR0101MB1057.prod.exchangelabs.com>
Date:	Thu, 17 Mar 2016 16:59:10 +0000
From:	Hartley Sweeten <HartleyS@...ionengravers.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Ian Abbott <abbotti@....co.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] staging/comedi/dt282x: avoid integer overflow warning

On Thursday, March 17, 2016 9:09 AM, Arnd Bergmann wrote:
> On Thursday 17 March 2016 15:47:57 Hartley Sweeten wrote:
>> On Wednesday, March 16, 2016 1:51 PM, Arnd Bergmann wrote:
>> 
>> Is this a gcc-6 specific issue? Seems line this warning should be showing
>> up in a lot of drivers.
>
> Yes, I did not see this before moving to gcc-6.0, but this is the only driver
> I've encountered the warning for, in around 7000 randconfig builds.

Weird...

> Feel free to come up with a different patch. I've put the patch on
> my 'submitted' stack for now and will get back to it after 4.7-rc1 if
> the warning remains.

I'll post an alternate patch shortly that is more consistent with the
other comedi drivers.

If you could test that it fixes the gcc-6 issue that would be great!

Thanks,
Hartley