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acpi: fix potential call to a freed memory section.

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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 <[email protected]>
Cc: Len Brown <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Aaron Durbin 2007-05-16 22:11:06 -07:00 • committed by Linus Torvalds
commit f363d16fbb
2 changed files with 6 additions and 9 deletions
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7
include/acpi/acpi_numa.h
View file

@ -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);