Messages in this thread | | | Date | Sun, 24 Aug 2008 09:43:04 -0700 | From | "H. Peter Anvin" <> | Subject | Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask_bitmask+0xc3/0xe0() |
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Vegard Nossum wrote: > > Hm. > > Kernel fails to detect cpu1 at all. > > I am currently unsure of whether it's your patch or not. But it's the > same config that I've been booting for ages (and I copy it over for > each new kernel version I check out). > > Processor #0 (Bootup-CPU) > I/O APIC #2 Version 32 at 0xFEC00000. > Enabling APIC mode: Flat. Using 1 I/O APICs > Processors: 1 > SMP: Allowing 1 CPUs, 0 hotplug CPUs > mapped APIC to ffffb000 (fee00000) > mapped IOAPIC to ffffa000 (fec00000) > Allocating PCI resources starting at 50000000 (gap: 40000000:bee00000) > PERCPU: Allocating 1221764 bytes of per cpu data > NR_CPUS: 7, nr_cpu_ids: 1, nr_node_ids 1 > > I really don't get it. Is this something that can be caused by your > patch _at all_ ? >
Well, if smp_call_function_single() is called during the CPU up sequence, without the CPU having been added to the online mask, then yes, it could. The most likely place would be from a notifier.
That makes it ugly. Need to track down the reason.
-hpa
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