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Date: Thu, 2 Jan 2003 16:00:34 -0800
From: William Lee Irwin III <wli@holomorphy.com>
To: "Jeff V. Merkey" <jmerkey@vger.timpanogas.org>
Cc: linux-kernel@vger.kernel.org, jmerkey@timpanogas.org
Subject: Re: Questton about Zone Allocation 2.4.X
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	"Jeff V. Merkey" <jmerkey@vger.timpanogas.org>,
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References: <20030102175517.A21471@vger.timpanogas.org> <20030102235147.GS9704@holomorphy.com> <20030102180849.A21498@vger.timpanogas.org>
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At some point in the past, I wrote:
>> __get_free_pages() allocates from lowmem (i.e. 0-4GB) only.
>> Allocate from highmem instead.

0-1GB. page_address() will give unpredictable results on highmem GFP masks.

On Thu, Jan 02, 2003 at 06:08:49PM -0700, Jeff V. Merkey wrote:
> 0-4GB is where I need to allocate, so allocating from highmem is not 
> a solution.  I found the Ingo/Andrea patch for RH 8.0, but this patch 
> looks a little scary since it affects the memory allocations between
> user and kernel space and the ratios alloted to these areas (I may 
> be missing something here -- as Dave M. puts it "Jeff you are such a pain
> in the ass sometimes"  :-).  

There is no GFP mask for it. Port Jens' ZONE_DMA32 or something, or roll
ZONE_4G on your own if need be.


Bill
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