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authorKurt Garloff <kurt@garloff.de>2012-01-17 04:18:02 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-25 16:13:46 -0800
commit45ed93deefc42db6c0cf3154f50f5f6404d7ecf5 (patch)
tree3344229d577646b8ab6b2a2f05576841bd7e4810
parentcaa3e3bed0bf0ec356101811dcd46c9603ec3788 (diff)
downloadlwn-45ed93deefc42db6c0cf3154f50f5f6404d7ecf5.tar.gz
lwn-45ed93deefc42db6c0cf3154f50f5f6404d7ecf5.zip
ACPI: Store SRAT table revision
commit 8df0eb7c9d96f9e82f233ee8b74e0f0c8471f868 upstream. In SRAT v1, we had 8bit proximity domain (PXM) fields; SRAT v2 provides 32bits for these. The new fields were reserved before. According to the ACPI spec, the OS must disregrard reserved fields. In order to know whether or not, we must know what version the SRAT table has. This patch stores the SRAT table revision for later consumption by arch specific __init functions. Signed-off-by: Kurt Garloff <kurt@garloff.de> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/acpi/numa.c6
-rw-r--r--include/acpi/acpi_numa.h1
2 files changed, 7 insertions, 0 deletions
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 3b5c3189fd99..e56f3be7b07d 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -45,6 +45,8 @@ static int pxm_to_node_map[MAX_PXM_DOMAINS]
static int node_to_pxm_map[MAX_NUMNODES]
= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
+unsigned char acpi_srat_revision __initdata;
+
int pxm_to_node(int pxm)
{
if (pxm < 0)
@@ -255,9 +257,13 @@ acpi_parse_memory_affinity(struct acpi_subtable_header * header,
static int __init acpi_parse_srat(struct acpi_table_header *table)
{
+ struct acpi_table_srat *srat;
if (!table)
return -EINVAL;
+ srat = (struct acpi_table_srat *)table;
+ acpi_srat_revision = srat->header.revision;
+
/* Real work done in acpi_table_parse_srat below. */
return 0;
diff --git a/include/acpi/acpi_numa.h b/include/acpi/acpi_numa.h
index 173972672175..451823cb8837 100644
--- a/include/acpi/acpi_numa.h
+++ b/include/acpi/acpi_numa.h
@@ -15,6 +15,7 @@ extern int pxm_to_node(int);
extern int node_to_pxm(int);
extern void __acpi_map_pxm_to_node(int, int);
extern int acpi_map_pxm_to_node(int);
+extern unsigned char acpi_srat_revision;
#endif /* CONFIG_ACPI_NUMA */
#endif /* __ACP_NUMA_H */