linux-kernel - Re: [PATCH/RFC] introduce ARCH_CAN_UNALIGNED

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Message-Id: <1206025097.16475.139.camel@johannes.berg>
Date:	Thu, 20 Mar 2008 15:58:17 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Will Newton <will.newton@...il.com>
Cc:	Daniel Drake <dsd@...too.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH/RFC] introduce ARCH_CAN_UNALIGNED_ACCESS Kconfig symbol


On Thu, 2008-03-20 at 14:39 +0000, Will Newton wrote:
> On Thu, Mar 20, 2008 at 2:34 PM, Johannes Berg
> <johannes@...solutions.net> wrote:
> 
> >  +For some ethernet hardware that cannot DMA to unaligned addresses like
> >  +4*n+2 or non-ethernet hardware, this can be a problem, and it is then
> >  +required to copy the incoming frame into an aligned buffer. Because this is
> >  +unnecessary on architectures that can do unaligned accesses, the code can be
> >  +made depend on CONFIG_ARCH_CAN_UNALIGNED_ACCESS like so:
> >  +
> >  +#ifdef CONFIG_ARCH_CAN_UNALIGNED_ACCESS
> >  +       skb = copy skb
> >  +#else
> >  +       skb = original skb
> >  +#endif
> 
> Is this logic reversed?

Euh, indeed, thanks. Will repost after having more comments.

johannes

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