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

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Date:	Wed, 11 Jul 2012 09:55:25 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Arnd Bergmann <arnd@...db.de>, 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 10:44:29PM +0100, Catalin Marinas wrote:
> On Tue, Jul 10, 2012 at 09:35:27PM +0100, 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?
> 
> Definitely not, I don't think anyone claimed this. The 32-bit ARM code
> will have the same important place for a very long time, ARM Ltd isn't
> withdrawing support for this (it's the main revenue generator). I expect
> to see many new 32-bit platforms to appear, MP systems, big.little
> configurations etc. If there is need for bigger physical address space,
> LPAE support (even with its drawbacks) is still the preferred choice for
> mobile systems.

Just to be clear in case it doesn't look aligned with Arnd's comment.
I'm referring to the 32-bit ARM port - it has the same important place
as before, nothing from the 32-bit architecture code is thrown away
(over time, we may want to clean up old architecture versions but that's
a normal thing).

How the 32-bit ARM SoC is refactored and maintained it's up to the
arm-soc team and they are doing a great job.

-- 
Catalin
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