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Subject[PATCH] acpi: Fix potential call to a freed memory section.
Strip __cpuinit[data] from Node <-> PXM routines and supporting data structures.
Also make pxm_to_node_map and node_to_pxm_map local to the numa acpi module.

This fixes a bug triggered by the following conditions:
- boot on a machine with a SLIT table defined
- kernel is configured w/ CONFIG_HOTPLUG_CPU=n
- cat /sys/devices/system/node/node*/distance
This will cause an oops by calling into a freed memory section.

In particular, on x86_64, __node_distance calls node_to_pxm().

Signed-off-by: Aaron Durbin <adurbin@google.com>
---

diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 8fcd6a1..a2efae8 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -40,19 +40,19 @@ #define PXM_INVAL -1
#define NID_INVAL -1

/* maps to convert between proximity domain and logical node ID */
-int __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
+static int pxm_to_node_map[MAX_PXM_DOMAINS]
= { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
-int __cpuinitdata node_to_pxm_map[MAX_NUMNODES]
+static int node_to_pxm_map[MAX_NUMNODES]
= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };

-int __cpuinit pxm_to_node(int pxm)
+int pxm_to_node(int pxm)
{
if (pxm < 0)
return NID_INVAL;
return pxm_to_node_map[pxm];
}

-int __cpuinit node_to_pxm(int node)
+int node_to_pxm(int node)
{
if (node < 0)
return PXM_INVAL;
diff --git a/include/acpi/acpi_numa.h b/include/acpi/acpi_numa.h
index f9d2bde..b62cd36 100644
--- a/include/acpi/acpi_numa.h
+++ b/include/acpi/acpi_numa.h
@@ -11,11 +11,8 @@ #else
#define MAX_PXM_DOMAINS (256) /* Old pxm spec is defined 8 bit */
#endif

-extern int __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS];
-extern int __cpuinitdata node_to_pxm_map[MAX_NUMNODES];
-
-extern int __cpuinit pxm_to_node(int);
-extern int __cpuinit node_to_pxm(int);
+extern int pxm_to_node(int);
+extern int node_to_pxm(int);
extern int __cpuinit acpi_map_pxm_to_node(int);
extern void __cpuinit acpi_unmap_pxm_to_node(int);

-
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