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author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2006-09-25 16:25:31 -0700 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-25 17:38:36 -0700 |
commit | 3212fe1594e577463bc8601d28aa008f520c3377 (patch) | |
tree | 6f4270c825c2df9f4a361360dab0963ecaed34c1 /arch/ia64/kernel/numa.c | |
parent | 08992986497471ce575f23796268fb1b50b5c2ab (diff) | |
download | linux-3212fe1594e577463bc8601d28aa008f520c3377.tar.gz linux-3212fe1594e577463bc8601d28aa008f520c3377.tar.bz2 linux-3212fe1594e577463bc8601d28aa008f520c3377.zip |
[PATCH] 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: "Luck, Tony" <tony.luck@intel.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ia64/kernel/numa.c')
-rw-r--r-- | arch/ia64/kernel/numa.c | 34 |
1 files changed, 31 insertions, 3 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); } } |