x86: restore pda nodenumber field
* Restore the nodenumber field in the x86_64 pda. This field is slightly different than the x86_cpu_to_node_map mainly because it's a static indication of which node the cpu is on while the cpu to node map is a dyanamic mapping that may get reset if the cpu goes offline. This also simplifies the numa_node_id() macro. For inclusion into sched-devel/latest tree. Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + sched-devel/latest .../mingo/linux-2.6-sched-devel.git Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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3 changed files with 6 additions and 1 deletions
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@ -32,6 +32,7 @@ EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
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#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
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#define X86_64_NUMA 1
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/* map cpu index to node index */
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DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
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EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
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#endif
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@ -155,6 +156,9 @@ void __cpuinit numa_set_node(int cpu, int node)
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{
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int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
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if (node != NUMA_NO_NODE)
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cpu_pda(cpu)->nodenumber = node;
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if (cpu_to_node_map)
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cpu_to_node_map[cpu] = node;
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@ -22,6 +22,7 @@ struct x8664_pda {
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offset 40!!! */
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#endif
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char *irqstackptr;
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int nodenumber; /* number of current node */
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unsigned int __softirq_pending;
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unsigned int __nmi_count; /* number of NMI on this CPUs */
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short mmu_state;
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@ -66,7 +66,7 @@ extern cpumask_t node_to_cpumask_map[];
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DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
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/* Returns the number of the current Node. */
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#define numa_node_id() (per_cpu(x86_cpu_to_node_map, raw_smp_processor_id()))
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#define numa_node_id() read_pda(nodenumber)
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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extern int cpu_to_node(int cpu);
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