Date: Fri, 4 Jul 2008 19:58:00 +0200
From: Pierre Ossman <drzeus-list@drzeus.cx>
To: LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org
Subject: Re: How to alloc highmem page below 4GB on i386?
Message-ID: <20080704195800.4ef6e00a@mjolnir.drzeus.cx>
In-Reply-To: <20080630200323.2a5992cd@mjolnir.drzeus.cx>
References: <20080630200323.2a5992cd@mjolnir.drzeus.cx>
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On Mon, 30 Jun 2008 20:03:23 +0200
Pierre Ossman <drzeus-list@drzeus.cx> wrote:

> Simple question. How do I allocate a page from highmem, that's still
> within 32 bits? x86_64 has the DMA32 zone, but i386 has just HIGHMEM.
> As most devices can't DMA above 32 bit, I have 3 GB of memory that's
> not getting decent usage (or results in needless bouncing). What to do?
>=20
> I tried just enabling CONFIG_DMA32 for i386, but there is some guard
> against too many memory zones. I'm assuming this is there for a good
> reason?
>=20

Anyone?

--=20
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

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