linux-kernel - Re: [PATCH] introduce HAVE_EFFICIENT_UNALIGNED

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Date:	Tue, 8 Apr 2008 21:11:33 +0200
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, sam <sam@...nborg.org>
Subject: Re: [PATCH] introduce HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol

Hi,

On Tuesday 8. April 2008, Johannes Berg wrote:

> In many cases, especially in networking, it can be beneficial to
> know at compile time whether the architecture can do unaligned
> accesses efficiently. This patch introduces a new Kconfig symbol
> 	HAVE_EFFICIENT_UNALIGNED_ACCESS
> for that purpose and adds it to the powerpc and x86 architectures.
> Also add some documentation about alignment and networking, and
> especially one intended use of this symbol.

Please CC linux-arch@...r.kernel.org for such changes, so it's more likely 
noticed by more arch maintainers, so a list can be compiled what is 
appropriate for the various archs.
The scope of this symbol is IMO a little unclear, is it intended for one-time 
accesses to small object or also for repeated accesses to larger objects?
Anyway, this probably should be set for m68k as well.

bye, Roman
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