[PATCH] x86_64: Clear more state when ignoring empty node in SRAT parsing
Might fix boot failures on systems with empty PXMs in SRAT
Signed-off-by: Andi Kleen <ak@suse.de>
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 8b7f856..3bd827f 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -26,6 +26,10 @@
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)
@@ -223,6 +227,16 @@
return 1;
}
+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. */
@@ -230,16 +244,16 @@
{
int i;
+ /* First clean up the node list */
+ 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);
- }
-
if (!nodes_cover_memory()) {
bad_srat();
return -1;