On Fri, Jun 23, 2006 at 05:14:23PM +0200, Franck Bui-Huu wrote:
> Franck Bui-Huu wrote:
> > - free_area_init_node(0, NODE_DATA(0), zones_size,
> > - __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL);
>
> I'm wondering why using "__pa(PAGE_OFFSET) >> PAGE_SHIFT" to compute the start
> of memory. That should always result in 0, shouldn't it ?
No. There are platforms where memory starts at about 3GB physical,
so __pa(PAGE_OFFSET) = 0xc0000000, which most definitely isn't zero
when shifted right by PAGE_SHIFT.
The world is not a PC.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
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