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: > > start_kernel > ... > -> 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 dependencies? > Thoughts? Does that mean we need something similar to x86 for powerpc? Tejun is the expert in this area. CCing him. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>