The patch titled
cpu to node relationship fixup: map cpu to node
has been added to the -mm tree. Its filename is
cpu-to-node-relationship-fixup-map-cpu-to-node.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: cpu to node relationship fixup: map cpu to node
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
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>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
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(-)
diff -puN arch/ia64/kernel/numa.c~cpu-to-node-relationship-fixup-map-cpu-to-node arch/ia64/kernel/numa.c
--- a/arch/ia64/kernel/numa.c~cpu-to-node-relationship-fixup-map-cpu-to-node
+++ a/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 -puN arch/ia64/kernel/topology.c~cpu-to-node-relationship-fixup-map-cpu-to-node arch/ia64/kernel/topology.c
--- a/arch/ia64/kernel/topology.c~cpu-to-node-relationship-fixup-map-cpu-to-node
+++ a/arch/ia64/kernel/topology.c
@@ -36,6 +36,9 @@ int arch_register_cpu(int num)
*/
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 @@ 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);
diff -puN include/asm-ia64/numa.h~cpu-to-node-relationship-fixup-map-cpu-to-node include/asm-ia64/numa.h
--- a/include/asm-ia64/numa.h~cpu-to-node-relationship-fixup-map-cpu-to-node
+++ a/include/asm-ia64/numa.h
@@ -64,6 +64,10 @@ extern int paddr_to_nid(unsigned long pa
#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
_
Patches currently in -mm which might be from kamezawa.hiroyu@xxxxxxxxxxxxxx are
cpu-to-node-relationship-fixup-take2.patch
cpu-to-node-relationship-fixup-map-cpu-to-node.patch
hot-add-mem-x86_64-fixup-externs.patch
hot-add-mem-x86_64-kconfig-changes.patch
hot-add-mem-x86_64-enable-sparsemem-in-sratc.patch
hot-add-mem-x86_64-memory_add_physaddr_to_nid-enable.patch
hot-add-mem-x86_64-memory_add_physaddr_to_nid-node-fixup.patch
hot-add-mem-x86_64-memory_add_physaddr_to_nid-node-fixup-fix.patch
hot-add-mem-x86_64-use-config_memory_hotplug_sparse.patch
hot-add-mem-x86_64-use-config_memory_hotplug_reserve.patch
hot-add-mem-x86_64-use-config_memory_hotplug_reserve-fix.patch
introduce-mechanism-for-registering-active-regions-of-memory.patch
have-power-use-add_active_range-and-free_area_init_nodes.patch
have-x86-use-add_active_range-and-free_area_init_nodes.patch
have-x86-use-add_active_range-and-free_area_init_nodes-fix.patch
have-x86_64-use-add_active_range-and-free_area_init_nodes.patch
have-ia64-use-add_active_range-and-free_area_init_nodes.patch
account-for-memmap-and-optionally-the-kernel-image-as-holes.patch
account-for-holes-that-are-outside-the-range-of-physical-memory.patch
allow-an-arch-to-expand-node-boundaries.patch
proc-readdir-race-fix-take-3.patch
proc-readdir-race-fix-take-3-fix-1.patch
proc-readdir-race-fix-take-3-fix-2.patch
namespaces-utsname-sysctl-hack.patch
reiser4-hardirq-include-fix.patch
-
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