[lkml]   [2002]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    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().

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:27    [W:0.022 / U:3.552 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site