linux-kernel - Re: [PATCH v5 15/19] ARM: LPAE: Add support for cpu_v7_do

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Message-id: <alpine.LFD.2.00.1105201407480.14430@xanadu.home>
Date:	Fri, 20 May 2011 14:09:20 -0400 (EDT)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Tony Lindgren <tony@...mide.com>,
	linux-arm-kernel@...ts.infradead.org,
	lkml <linux-kernel@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH v5 15/19] ARM: LPAE: Add support for
 cpu_v7_do_(suspend|resume)

On Fri, 20 May 2011, Catalin Marinas wrote:
> On Wed, 2011-05-18 at 08:27 +0100, Tony Lindgren wrote:
> > Do we really need all this ifdef else throughout this series?
> > 
> > I think we already have things in place to do this dynamically
> > like we already do for thumb, smp_on_up, v6 vs v7 and so on.
> 
> By dynamically, do you mean at run-time? We won't be able to compile
> both classic and LPAE in the same kernel, there is just too much
> difference between them (2 vs 3 levels of page tables - LPAE is an
> entirely new format).
> 
> If you mean some simpler macros like what we have for ARM/THUMB to
> reduce the number of lines, I'm fine with it though we don't always have
> a 1:1 mapping between LPAE and non-LPAE instructions.
> 
> Alternatively, I'm happy to create a separate proc-v7lpae.S file.

That would probably be the best option.


Nicolas
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