linux-kernel - Re: [PATCH 2/2] net: spider_net: avoid using signed char for bitops

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Message-ID: <20141003151724.GB20398@kwain>
Date:	Fri, 3 Oct 2014 17:17:24 +0200
From:	Antoine Tenart <antoine.tenart@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	dan.carpenter@...cle.com, kou.ishizaki@...hiba.co.jp,
	jens@...ibm.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net: spider_net: avoid using signed char for bitops

Hi Arnd,

On Fri, Oct 03, 2014 at 05:15:05PM +0200, Arnd Bergmann wrote:
> On Friday 03 October 2014 17:01:56 Antoine Tenart wrote:
> > Signedness bugs may occur when using signed char for bitops,
> > depending on if the highest bit is ever used.
> > 
> > Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> > 
> 
> It's probably worth mentioning here that this cannot happen in this
> driver because it's only used in one powerpc-specific chip, and 'char'
> is always 'unsigned' on powerpc.

Oh, that's good to know :)


Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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