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authorDavid Rientjes <rientjes@google.com>2007-07-21 17:10:33 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-21 18:37:10 -0700
commit08705b89ecb0f4b0ba5735630ef988bd9fd9dd95 (patch)
tree1b6b51c28cb852dcef4b343c5d8ac0afe276ed0b /arch/x86_64
parent3484d79813707bb6045773953a809abba443dc20 (diff)
x86_64: fake apicid_to_node mapping for fake numa
When we are in the emulated NUMA case, we need to make sure that all existing apicid_to_node mappings that point to real node ID's now point to the equivalent fake node ID's. If we simply iterate over all apicid_to_node[] members for each node, we risk remapping an entry if it shares a node ID with a real node. Since apicid's may not be consecutive, we're forced to create an automatic array of apicid_to_node mappings and then copy it over once we have finished remapping fake to real nodes. Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/mm/srat.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index 7ac8ff333e8..acdf03e1914 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -470,10 +470,13 @@ static int __init find_node_by_addr(unsigned long addr)
*/
void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
{
- int i;
+ int i, j;
int fake_node_to_pxm_map[MAX_NUMNODES] = {
[0 ... MAX_NUMNODES-1] = PXM_INVAL
};
+ unsigned char fake_apicid_to_node[MAX_LOCAL_APIC] = {
+ [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
+ };
printk(KERN_INFO "Faking PXM affinity for fake nodes on real "
"topology.\n");
@@ -487,9 +490,17 @@ void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
if (pxm == PXM_INVAL)
continue;
fake_node_to_pxm_map[i] = pxm;
+ /*
+ * For each apicid_to_node mapping that exists for this real
+ * node, it must now point to the fake node ID.
+ */
+ for (j = 0; j < MAX_LOCAL_APIC; j++)
+ if (apicid_to_node[j] == nid)
+ fake_apicid_to_node[j] = i;
}
for (i = 0; i < num_nodes; i++)
__acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
+ memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
nodes_clear(nodes_parsed);
for (i = 0; i < num_nodes; i++)