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x86: restore pda nodenumber field

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* 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>
This commit is contained in:
Mike Travis 2008-05-12 21:21:12 +02:00 committed by Ingo Molnar
parent 23ca4bba3e
commit 7891a24e1e
3 changed files with 6 additions and 1 deletions
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4
arch/x86/kernel/setup.c
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@ -32,6 +32,7 @@ EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
#define X86_64_NUMA 1
/* map cpu index to node index */
DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
#endif
@ -155,6 +156,9 @@ void __cpuinit numa_set_node(int cpu, int node)
{
int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
if (node != NUMA_NO_NODE)
cpu_pda(cpu)->nodenumber = node;
if (cpu_to_node_map)
cpu_to_node_map[cpu] = node;

1
include/asm-x86/pda.h
View File

@ -22,6 +22,7 @@ struct x8664_pda {
offset 40!!! */
#endif
char *irqstackptr;
int nodenumber; /* number of current node */
unsigned int __softirq_pending;
unsigned int __nmi_count; /* number of NMI on this CPUs */
short mmu_state;

2
include/asm-x86/topology.h
View File

@ -66,7 +66,7 @@ extern cpumask_t node_to_cpumask_map[];
DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
/* Returns the number of the current Node. */
#define numa_node_id() (per_cpu(x86_cpu_to_node_map, raw_smp_processor_id()))
#define numa_node_id() read_pda(nodenumber)
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
extern int cpu_to_node(int cpu);