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    SubjectRe: [Bug] 2.6.18-rc6-mm2 i386 trouble finding RSDT in get_memcfg_from_srat
    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?

    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;

    -- Dave

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      Last update: 2006-09-15 01:25    [W:0.020 / U:12.452 seconds]
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