-stable review patch. If anyone has any objections, please let us know.
------------------
Fix boot failures on systems with bad PXMs.
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
---
arch/x86_64/mm/srat.c | 28 +++++++++++++++++++++-------
1 files changed, 21 insertions(+), 7 deletions(-)
Index: linux-2.6.15.3/arch/x86_64/mm/srat.c
===================================================================
--- linux-2.6.15.3.orig/arch/x86_64/mm/srat.c
+++ linux-2.6.15.3/arch/x86_64/mm/srat.c
@@ -25,6 +25,10 @@ static nodemask_t nodes_found __initdata
static struct node nodes[MAX_NUMNODES] __initdata;
static __u8 pxm2node[256] = { [0 ... 255] = 0xff };
+/* Too small nodes confuse the VM badly. Usually they result
+ from BIOS bugs. */
+#define NODE_MIN_SIZE (4*1024*1024)
+
static int node_to_pxm(int n);
int pxm_to_node(int pxm)
@@ -168,22 +172,32 @@ acpi_numa_memory_affinity_init(struct ac
nd->start, nd->end);
}
+static void unparse_node(int node)
+{
+ int i;
+ node_clear(node, nodes_parsed);
+ for (i = 0; i < MAX_LOCAL_APIC; i++) {
+ if (apicid_to_node[i] == node)
+ apicid_to_node[i] = NUMA_NO_NODE;
+ }
+}
+
void __init acpi_numa_arch_fixup(void) {}
/* Use the information discovered above to actually set up the nodes. */
int __init acpi_scan_nodes(unsigned long start, unsigned long end)
{
int i;
+
+ for (i = 0; i < MAX_NUMNODES; i++) {
+ cutoff_node(i, start, end);
+ if ((nodes[i].end - nodes[i].start) < NODE_MIN_SIZE)
+ unparse_node(i);
+ }
+
if (acpi_numa <= 0)
return -1;
- /* First clean up the node list */
- for_each_node_mask(i, nodes_parsed) {
- cutoff_node(i, start, end);
- if (nodes[i].start == nodes[i].end)
- node_clear(i, nodes_parsed);
- }
-
memnode_shift = compute_hash_shift(nodes, nodes_weight(nodes_parsed));
if (memnode_shift < 0) {
printk(KERN_ERR
--
-
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