linux-kernel - Re: [PATCH 3/3] ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build

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Date:	Fri, 05 Jun 2015 14:26:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Gregory Fong <gregory.0xf0@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Kevin Cernekee <cernekee@...il.com>,
	Russell King <linux@....linux.org.uk>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build

On Thursday 04 June 2015 18:58:38 Gregory Fong wrote:
> ARMv7 chips with LPAE can often benefit from SPARSEMEM, as portions of
> system memory can be located deep in the 36-bit address space.  Allow
> FLATMEM or SPARSEMEM to be selectable at compile time; FLATMEM remains
> the default.
> 
> This is based on Kevin's "[PATCH 3/3] ARM: Allow either FLATMEM or
> SPARSEMEM on the multi-v7 build" from [1] and shamelessly rips off his
> commit message text above.  As Arnd pointed out at [2] there doesn't
> seem to be any reason to tie this specifically to ARMv7, so this has
> been changed to apply to all multiplatform kernels.
> 
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/286837.html
> [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/298950.html
> 
> Cc: Kevin Cernekee <cernekee@...il.com>
> Signed-off-by: Gregory Fong <gregory.0xf0@...il.com>
> ---
> I don't have any platforms other than armv7 handily set up to test SPARSEMEM,
> so any testing would be appreciated.  FLATMEM is still the default so at least
> nobody will see anything change unless they deliberately switch.
> 

Can you check that realview at least builds with your series? It probably
will, but it's not obvious as there are some tricky bits with the
various realview config options.

	Arnd
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