[Xen-devel] [PATCH] x86: make pxm_to_node() return sane values when disabling NUMA internally

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

Otherwise, pass-through code may call memory allocation functions with
invalid node IDs, causing the allocations to fail.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- 2010-04-13.orig/xen/arch/x86/srat.c 2010-03-08 22:36:09.000000000 +0100
+++ 2010-04-13/xen/arch/x86/srat.c      2010-04-14 14:28:17.000000000 +0200
@@ -25,7 +25,7 @@ static struct acpi_table_slit *__read_mo
 static nodemask_t nodes_parsed __initdata;
 static nodemask_t nodes_found __initdata;
 static struct node nodes[MAX_NUMNODES] __initdata;
-static u8 __read_mostly pxm2node[256] = { [0 ... 255] = 0xff };
+static u8 __read_mostly pxm2node[256] = { [0 ... 255] = NUMA_NO_NODE };
 
 
 static int num_node_memblks;
@@ -112,6 +112,8 @@ static __init void bad_srat(void)
        acpi_numa = -1;
        for (i = 0; i < MAX_LOCAL_APIC; i++)
                apicid_to_node[i] = NUMA_NO_NODE;
+       for (i = 0; i < ARRAY_SIZE(pxm2node); i++)
+               pxm2node[i] = NUMA_NO_NODE;
 }
 
 #ifdef CONFIG_X86_64

Attachment: x86-bad-srat-clear-pxm2node.patch
Description: Text document

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