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

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Message-ID: <20120710214836.GB4733@arm.com>
Date:	Tue, 10 Jul 2012 22:48:36 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Olof Johansson <olof@...om.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 00/36] AArch64 Linux kernel port

On Tue, Jul 10, 2012 at 10:19:38PM +0100, Arnd Bergmann wrote:
> On Tuesday 10 July 2012, Ingo Molnar wrote:
> > Do you really think that all of the 32-bit ARM code should 
> > essentially be thrown away when going to 64-bit ARM, that 
> > patches can only touch arch/arm64/ + drivers/ or the highway?
> 
> Yes.
> 
> If you're curious, please have a look at arch/arm/mach-spear13xx/.
> this is the latest platform that we have added. It's fully
> functional (except PCI, which I hope will be added in
> drivers/pci/bus, which is another story), A significant portion
> of that platform deals with SMP support, which is being standardized
> for AArch64, so there will be only one implementation. Another
> big portion is DMA-engine support, which is moving out of arch/arm
> as soon as we have a proper DT binding. Finally there are some
> boilerplate header files that are going away too.
> 
> Once we're done with this, we will basically need zero code
> in arch/*/ to support a new platform, and that is very easy
> to share between two distinct arch/* directories ;-)

OK, so Arnd's plan for 32-bit ARM SoCs are even better than what I've
envisaged ;)

-- 
Catalin
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