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

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Message-ID: <9201792.OAu7xPjvdN@wuerfel>
Date:	Fri, 03 Oct 2014 17:15:05 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	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

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.

	Arnd
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