Messages in this thread | | | Date | Fri, 12 Jul 2002 16:04:02 -0700 | From | William Lee Irwin III <> | Subject | Re: NUMA-Q breakage 2/7 xquad_portio ioremap deadlock |
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>> 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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