Re: 2.6.17-mm1

[Russell King]

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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