From: Christoph Lameter <clameter@sgi.com>
To: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: "Cestonaro,
Thilo (external)" <Thilo.Cestonaro.external@fujitsu-siemens.com>,
linux-kernel@vger.kernel.org
Subject: Re: How to guarantee that kmalloc returns an address below 4GB
Date: Thu, 17 May 2007 11:46:58 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0705171145330.3010@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <464B02FF.1060000@s5r6.in-berlin.de>
On Wed, 16 May 2007, Stefan Richter wrote:
> Cestonaro, Thilo (external) wrote:
> > is there an option for kmalloc, which I can use to allocate
> > a buffer which is in physical memory placed below 4GB?
> > Not in a remapped area.
>
> GFP_DMA32
Nope. There are no general slabs available for DMA32.
You could use a dma slab by specifying GFP_DMA. However, on i386 and
x86_64 this will get you memory in the precious first 16MB. On IA64 and
other platforms you will get memory < 4GB.
Another option is to use the page allocator and specify GFP_DMA32.
prev parent reply other threads:[~2007-05-17 18:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-16 8:30 Cestonaro, Thilo (external)
2007-05-16 13:11 ` Stefan Richter
2007-05-17 18:46 ` Christoph Lameter [this message]
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