linux-kernel - Re: [PATCH 00/36] AArch64 Linux kernel port

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Message-Id: <201207091633.08052.arnd@arndb.de>
Date:	Mon, 9 Jul 2012 16:33:07 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/36] AArch64 Linux kernel port

On Monday 09 July 2012, Catalin Marinas wrote:
> On Mon, Jul 09, 2012 at 04:32:11PM +0100, Arnd Bergmann wrote:
> > We have a lot of reviewers that are familiar with the 32 bit code, so
> > I think the main strategy should be to spot duplicate code early
> > and make sure we deal with it individually. Examples for this are
> > probably the implementations for kvm and perf, which largely deal
> > with the same hardware on both architectures. Those definitely must
> > not get duplicated into mostly-identical files. In many cases, we're
> > moving those things into drivers/*, in other cases we might want to
> > use Makefile logic to include a sub-directory from one arch into another,
> > as we do for arch/um.
> 
> I don't see why we would need to get a subdir from one into the other.
> If the SoCs would need some common drivers (like GPIO), they should go
> into drivers/ anyway. There is some perf code that could be shared
> (though not building a subdir as we have different instruction sets) but
> I would like that moved to a more generic place.

I think either way works for the two examples I've given, we can do
whatever people are more comfortable with. All architectures today have
kvm and perf under arch/*/* so we could keep it that way and do an
ugly redirect, or we could get everyone to move to drivers/.

	Arnd
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