linux-kernel - Re: [PATCH] introduce HAVE_EFFICIENT_UNALIGNED

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Date:	Wed, 09 Apr 2008 15:43:43 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Roman Zippel <zippel@...ux-m68k.org>
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,

> 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.

Hah. I thought there was such a list but it didn't show up in
MAINTAINERS so I thought I was wrong.

> 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.

Also for repeated accesses, for example network packets where the IPv4
header might not always be aligned. That's why we want it to be
"efficient", not just "possible" (as an earlier version of the patch
called it.)

johannes

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