linux/include/acpi/acpi_numa.h
Aaron Durbin f363d16fbb 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>
Cc: Len Brown <lenb@kernel.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-17 05:23:04 -07:00

21 lines
486 B
C

#ifndef __ACPI_NUMA_H
#define __ACPI_NUMA_H
#ifdef CONFIG_ACPI_NUMA
#include <linux/kernel.h>
/* Proximity bitmap length */
#if MAX_NUMNODES > 256
#define MAX_PXM_DOMAINS MAX_NUMNODES
#else
#define MAX_PXM_DOMAINS (256) /* Old pxm spec is defined 8 bit */
#endif
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);
#endif /* CONFIG_ACPI_NUMA */
#endif /* __ACP_NUMA_H */