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From: Ulrich Mueller <ulm@kph.uni-mainz.de>
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Date: Sat, 4 Feb 2006 11:23:19 +0100
To: Mark Lord <lkml@rtr.ca>
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>,
       Ulrich Mueller <ulm@kph.uni-mainz.de>,
       Herbert Poetzl <herbert@13thfloor.at>, linux-kernel@vger.kernel.org,
       Jens Axboe <axboe@suse.de>, Linus Torvalds <torvalds@osdl.org>,
       Byron Stanoszek <gandalf@winds.org>, Ingo Molnar <mingo@elte.hu>,
       Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH ]  VMSPLIT config options (with default config fixed)
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>>>>> On Fri, 03 Feb 2006, Mark Lord wrote:

>>> Hm, I wonder if we could have a more fine-grained choice of the
>>> boundary? There are also systems around with e.g. 1.25G or 1.5G of
>>> main memory.

>> Maybe something like:
>>	   config VMSPLIT_1G
>>		   bool "1G/3G user/kernel split"
>>	   config VMSPLIT_X
>>		   bool "Manual split"
>> endchoice
> ...

> Yes, that looks like a good idea.

Couldn't this still be implemented entirely in Kconfig, without
modifying page.h? Like in the following example:

	[...]
	config VMSPLIT_1G
		bool "1G/3G user/kernel split"
	config VMSPLIT_X
		bool "Manual split"
endchoice

config PAGE_OFFSET
	hex
	range 0x40000000 0xC0000000    
	prompt "Memory split address (must be aligned to 4096)" if VMSPLIT_X
	[...]
	default 0x40000000 if VMSPLIT_1G
	default 0xC0000000

Cheers
Uli