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[PATCH] x86_64: fix cpu_to_node setup for sparse apic_ids

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While booting with SMT disabled in bios, when using acpi srat to setup
cpu_to_node[], sparse apic_ids create problems.

Without this patch, intel x86_64 boxes with hyperthreading disabled in the
bios (and which rely on srat for numa setup) endup having incorrect values in
cpu_to_node[] arrays, causing sched domains to be built incorrectly etc.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ravikiran G Thirumalai 2005-07-28 21:15:55 -07:00 committed by Linus Torvalds
parent 5a7b90137d
commit 8c56ac3f3b
1 changed files with 11 additions and 6 deletions
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17
arch/x86_64/mm/srat.c
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@ -20,6 +20,9 @@
static struct acpi_table_slit *acpi_slit;
/* Internal processor count */
static unsigned int __initdata num_processors = 0;
static nodemask_t nodes_parsed __initdata;
static nodemask_t nodes_found __initdata;
static struct node nodes[MAX_NUMNODES] __initdata;
@ -101,16 +104,18 @@ acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
bad_srat();
return;
}
if (pa->apic_id >= NR_CPUS) {
printk(KERN_ERR "SRAT: lapic %u too large.\n",
pa->apic_id);
if (num_processors >= NR_CPUS) {
printk(KERN_ERR "SRAT: Processor #%d (lapic %u) INVALID. (Max ID: %d).\n",
num_processors, pa->apic_id, NR_CPUS);
bad_srat();
return;
}
cpu_to_node[pa->apic_id] = node;
cpu_to_node[num_processors] = node;
acpi_numa = 1;
printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> Node %u\n",
pxm, pa->apic_id, node);
printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> CPU %u -> Node %u\n",
pxm, pa->apic_id, num_processors, node);
num_processors++;
}
/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */