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    SubjectRe: [BUG 2.6.31-rc1] HIGHMEM64G causes hang in PCI init on 32-bit x86
    Rolf Eike Beer wrote:
    > H. Peter Anvin wrote:
    >> Mikael Pettersson wrote:
    >>> Thanks, 2.6.31-rc1 vanilla (which didn't boot) plus this one does boot.
    >>> /proc/iomem now looks as follows:
    >> ... as it should. So far so good, and this is a real problem.
    >>
    >> However, there is something that really bothers me: *why does this help
    >> on Mikael's system, which is PAE and therefore has a 64-bit
    >> resource_size_t*? This whole patch should be a no-op! There is still
    >> something that doesn't make sense.
    >>
    >> The use of "unsigned long" in ram_alignment() will overflow after 2^52
    >> bytes, but again, that's not the issue here, since the highest "start"
    >> value we have is (0x2 << 32).
    >
    > I assume you meant "2^32" and (0x1 << 32)?
    >

    No, I meant 2^52 and (0x2 << 32) [== 2^33.]

    -hpa



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