Assume that a cpu is *physically* offlined at boot time... Because smpboot.c::smp_boot_cpu_map() canoot find cpu's sapicid, numa.c::build_cpu_to_node_map() cannot build cpu<->node map for offlined cpu. For such cpus, cpu_to_node map should be fixed at cpu-hot-add. This mapping should be done before cpu onlining. This patch also handles cpu hotremove case. Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> arch/ia64/kernel/numa.c | 34 +++++++++++++++++++++++++++++++--- arch/ia64/kernel/topology.c | 6 +++++- include/asm-ia64/numa.h | 4 ++++ 3 files changed, 40 insertions(+), 4 deletions(-) Index: linux-2.6.18/arch/ia64/kernel/numa.c =================================================================== --- linux-2.6.18.orig/arch/ia64/kernel/numa.c 2006-09-22 14:22:44.000000000 +0900 +++ linux-2.6.18/arch/ia64/kernel/numa.c 2006-09-22 14:44:46.000000000 +0900 @@ -29,6 +29,36 @@ cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; +void __cpuinit map_cpu_to_node(int cpu, int nid) +{ + int oldnid; + if (nid < 0) { /* just initialize by zero */ + cpu_to_node_map[cpu] = 0; + return; + } + /* sanity check first */ + oldnid = cpu_to_node_map[cpu]; + if (cpu_isset(cpu, node_to_cpu_mask[oldnid])) { + return; /* nothing to do */ + } + /* we don't have cpu-driven node hot add yet... + In usual case, node is created from SRAT at boot time. */ + if (!node_online(nid)) + nid = first_online_node; + cpu_to_node_map[cpu] = nid; + cpu_set(cpu, node_to_cpu_mask[nid]); + return; +} + +void __cpuinit unmap_cpu_from_node(int cpu, int nid) +{ + WARN_ON(!cpu_isset(cpu, node_to_cpu_mask[nid])); + WARN_ON(cpu_to_node_map[cpu] != nid); + cpu_to_node_map[cpu] = 0; + cpu_clear(cpu, node_to_cpu_mask[nid]); +} + + /** * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays * @@ -49,8 +79,6 @@ node = node_cpuid[i].nid; break; } - cpu_to_node_map[cpu] = (node >= 0) ? node : 0; - if (node >= 0) - cpu_set(cpu, node_to_cpu_mask[node]); + map_cpu_to_node(cpu, node); } } Index: linux-2.6.18/include/asm-ia64/numa.h =================================================================== --- linux-2.6.18.orig/include/asm-ia64/numa.h 2006-09-22 14:22:44.000000000 +0900 +++ linux-2.6.18/include/asm-ia64/numa.h 2006-09-22 14:25:07.000000000 +0900 @@ -64,6 +64,10 @@ #define local_nodeid (cpu_to_node_map[smp_processor_id()]) +extern void map_cpu_to_node(int cpu, int nid); +extern void unmap_cpu_from_node(int cpu, int nid); + + #else /* !CONFIG_NUMA */ #define paddr_to_nid(addr) 0 Index: linux-2.6.18/arch/ia64/kernel/topology.c =================================================================== --- linux-2.6.18.orig/arch/ia64/kernel/topology.c 2006-09-22 14:22:44.000000000 +0900 +++ linux-2.6.18/arch/ia64/kernel/topology.c 2006-09-22 14:25:07.000000000 +0900 @@ -36,6 +36,9 @@ */ if (!can_cpei_retarget() && is_cpu_cpei_target(num)) sysfs_cpus[num].cpu.no_control = 1; +#ifdef CONFIG_NUMA + map_cpu_to_node(num, node_cpuid[num].nid); +#endif #endif return register_cpu(&sysfs_cpus[num].cpu, num); @@ -45,7 +48,8 @@ void arch_unregister_cpu(int num) { - return unregister_cpu(&sysfs_cpus[num].cpu); + unregister_cpu(&sysfs_cpus[num].cpu); + unmap_cpu_from_node(num, cpu_to_node(num)); } EXPORT_SYMBOL(arch_register_cpu); EXPORT_SYMBOL(arch_unregister_cpu); - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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