RE: [Patch] Allocate sparse vmemmap block above 4G

[Christoph Lameter]

On Fri, 9 Nov 2007, Zou, Nanhai wrote:

> > More magic values, both the 4GiB address here and the magic "1" at the
> > end are problems.
> > 
> Yes, the 4UL*1024*1024*1024 could be a define here.

The 4GB boundary here is MAX_DMA32_ADDRESS I guess? We are only having 
this problem because of the two DMA zones on x86_64. I thought Andi was 
getting rid of the first one at 16MB. If he would do so then ZONE_DMA 
could be used instead of DMA32 and everything will be fine.

For now you may want to put

#ifdef CONFIG_ZONE_DMA32

around this code since it depends on DMA32.
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