From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Fri, 5 Nov 2010 14:07:16 +0000
Subject: CONFIG_FORCE_MAX_ZONEORDER settable for all ARM architectures
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On Fri, Nov 05, 2010 at 09:59:41PM +0800, Eric Miao wrote:
> However, I'm not really sure about how the size of the memory region is chosen
> and if the MAX_ORDER issue can be solved as well. So I guess before that
> happens in mainline, would be acceptable to adjust MAX_ZONEORDER in a
> hackish way.

Even if you increase MAX_ZONEORDER, the chances of being able to allocate
such a large page at runtime will be fairly low due to fragmentation.
It's something the normal page allocator has never been very good with.