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SubjectRe: [Bug] 2.6.18-rc6-mm2 i386 trouble finding RSDT in get_memcfg_from_srat
On Thu, Sep 14, 2006 at 04:21:33PM -0700, Dave Hansen wrote:
> On Thu, 2006-09-14 at 19:04 -0400, Vivek Goyal wrote:
> > I think I know what is going on wrong here. boot_ioremap() is assuming
> > that only first 8MB of physical memory is being mapped and while
> > calculating the index into page table (boot_pte_index) we will truncate
> > any higher address bits.
>
> Vivek, are those pte pages still all contiguous?
>

Yes, they are. (arch/i386/kernel/head.S)

> Yeah, that's probably it. Keith, I'm trying to think of reasons why we
> need the mask here:
>
> #define boot_pte_index(address) \
> (((address) >> PAGE_SHIFT) & (BOOT_PTE_PTRS - 1))
>
> and I can't think of any other than just masking out the top of the
> virtual address. You could do this a bunch of other ways, like __pa().
>
> This might just work:
>
> static unsigned long boot_pte_index(unsigned long vaddr)
> {
> return __pa(vaddr) >> PAGE_SHIFT;
> }
>

This looks good. Should work.

Thanks
Vivek
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