Re: [RFC] Initial alpha-0 for new page allocator API

[Christoph Lameter <clameter@sgi.com>]

On Fri, 22 Sep 2006, Jesse Barnes wrote:

> > +	if (dev->coherent_dma_mask < 0xffffffff)
> > +		high = dev->coherent_dma_mask;
> 
> With your alloc_pages_range this check can go away.  I think only the dev 
> == NULL check is needed with this scheme since it looks like there's no 
> way (currently) for ISA devices to store their masks for later 
> consultation by arch code? 

This check is necessary to set up the correct high boundary for 
alloc_page_range.

> > +	if (high == -1L && low == 0L)
> > +		return alloc_pages(gfp_flags, order);
> 
> There's max_pfn, but on machines with large memory holes using it might not 
> help much.

I found node_start_pfn and node_spanned_pages in the node structure. That 
gives me the boundaries for a node and I think I can work with that.
 
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