[patch 36/54] acpi: fix potential call to a freed memory section.

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Aaron Durbin <adurbin@xxxxxxxxxx>

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@xxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>

---
 drivers/acpi/numa.c      |    8 ++++----
 include/acpi/acpi_numa.h |    7 ++-----
 2 files changed, 6 insertions(+), 9 deletions(-)

--- linux-2.6.21.4.orig/drivers/acpi/numa.c
+++ linux-2.6.21.4/drivers/acpi/numa.c
@@ -40,19 +40,19 @@ static nodemask_t nodes_found_map = NODE
 #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;
--- linux-2.6.21.4.orig/include/acpi/acpi_numa.h
+++ linux-2.6.21.4/include/acpi/acpi_numa.h
@@ -11,11 +11,8 @@
 #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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