linux-kernel - Re: [PATCH] drivers: net: ethernet: intel: e1000: e1000

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Message-ID: <53F21FB1.7060607@intel.com>
Date:	Mon, 18 Aug 2014 08:45:53 -0700
From:	Alexander Duyck <alexander.h.duyck@...el.com>
To:	Joe Perches <joe@...ches.com>
CC:	Krzysztof Majzerowicz-Jaszcz <cristos@...serv.org>,
	jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: net: ethernet: intel: e1000: e1000_ethtool.c
 coding style fixes

On 08/18/2014 08:31 AM, Joe Perches wrote:
> On Mon, 2014-08-18 at 08:29 -0700, Alexander Duyck wrote:
>> Doing any kind of pointer math on a void pointer is generally unsafe as
>> it is an incomplete type.  The only reason why it works in GCC is
>> because GCC has a nonstandard extension that makes it report as having a
>> size of 1.
> 
> I know.  It's used in quite a few places in kernel code
> so I believe it's now a base assumption for the kernel.

Well that is something that should probably be fixed then.  I don't
believe it is safe to be doing any kind of pointer math on a void pointer.

We really shouldn't be using any GCC specific bits unless we absolutely
have to.

Thanks,

Alex

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