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    SubjectRe: NUMA-Q breakage 2/7 xquad_portio ioremap deadlock
    >> The cpu_online_map stuff for hotplug cpu created a brand new bootstrap
    >> ordering problem for NUMA-Q. The mmapped portio region needs to be
    >> ioremapped early but ioremap attempts to do TLB shootdown, and
    >> smp_call_function() (called by flush_tlb_all()) deadlocks when
    >> cpu_online_map is uninitialized.

    On Fri, Jul 12, 2002 at 03:58:50PM -0700, Martin J. Bligh wrote:
    > Would it be slightly less of a hack if we just move the ioremap down below
    > set_bit(0, &cpu_online_map); later on in smp_boot_cpus ? Untested patch
    > below. As long as we set up the xquad_portio remap before any other cpus
    > are online, I can't see it matters exactly when we do it ....
    > Either that, or we just define cpu_online_map to be =1 to start with.
    > M.

    This looks better than fiddling with smp_call_function().

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