diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2006-09-25 16:25:31 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-10-13 13:23:26 -0700 |
| commit | 1ada841196360876c5077ae2431ce5b90f9bbec2 (patch) | |
| tree | 13a836246b535058f54666b227df186a07dc976c /arch | |
| parent | b1fc5287ba80bcbb7a4cdade1b62de6bb1c91479 (diff) | |
cpu to node relationship fixup: map cpu to node
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@jp.fujitsu.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/ia64/kernel/numa.c | 34 | ||||
| -rw-r--r-- | arch/ia64/kernel/topology.c | 4 |
2 files changed, 34 insertions, 4 deletions
diff --git a/arch/ia64/kernel/numa.c b/arch/ia64/kernel/numa.c index 1cc360c83e7a..20340631179f 100644 --- a/arch/ia64/kernel/numa.c +++ b/arch/ia64/kernel/numa.c @@ -29,6 +29,36 @@ EXPORT_SYMBOL(cpu_to_node_map); 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 @@ void __init build_cpu_to_node_map(void) 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); } } diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c index f648c610b10c..5629b45e89c6 100644 --- a/arch/ia64/kernel/topology.c +++ b/arch/ia64/kernel/topology.c @@ -36,6 +36,7 @@ int arch_register_cpu(int num) */ if (!can_cpei_retarget() && is_cpu_cpei_target(num)) sysfs_cpus[num].cpu.no_control = 1; + map_cpu_to_node(num, node_cpuid[num].nid); #endif return register_cpu(&sysfs_cpus[num].cpu, num); @@ -45,7 +46,8 @@ int arch_register_cpu(int num) 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); |