diff options
| author | David Rientjes <rientjes@google.com> | 2007-07-21 17:10:33 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-21 18:37:10 -0700 |
| commit | 08705b89ecb0f4b0ba5735630ef988bd9fd9dd95 (patch) | |
| tree | 1b6b51c28cb852dcef4b343c5d8ac0afe276ed0b /arch/x86_64/mm | |
| parent | 3484d79813707bb6045773953a809abba443dc20 (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/mm')
| -rw-r--r-- | arch/x86_64/mm/srat.c | 13 |
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++) |