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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>
This commit is contained in:
David Rientjes 2007-07-21 17:10:33 +02:00 committed by Linus Torvalds
parent 3484d79813
commit 08705b89ec
1 changed files with 12 additions and 1 deletions
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13
arch/x86_64/mm/srat.c
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@ -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++)