[PATCH] x86_64: fix cpu_to_node setup for sparse apic_ids

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>

diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index ec1c4aca45138af967b8bde8982739275dc1038d..8e3d097a9ddddc5ef1c179cd24ae28a6d7902163 100644 (file)
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -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 */