Node 0 not necessary for powerpc?
cl at linux.com
Thu May 22 00:16:27 EST 2014
On Mon, 19 May 2014, Nishanth Aravamudan wrote:
> I'm seeing a panic at boot with this change on an LPAR which actually
> has no Node 0. Here's what I think is happening:
> -> setup_per_cpu_areas
> -> pcpu_embed_first_chunk
> -> pcpu_fc_alloc
> -> ___alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu), ...
> -> smp_prepare_boot_cpu
> -> set_numa_node(boot_cpuid)
> So we panic on the NODE_DATA call. It seems that ia64, at least, uses
> pcpu_alloc_first_chunk rather than embed. x86 has some code to handle
> early calls of cpu_to_node (early_cpu_to_node) and sets the mapping for
> all CPUs in setup_per_cpu_areas().
Maybe we can switch ia64 too embed? Tejun: Why are there these
> Thoughts? Does that mean we need something similar to x86 for powerpc?
Tejun is the expert in this area. CCing him.
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