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authorKurt Garloff <kurt@garloff.de>2012-01-17 04:20:31 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-25 16:13:47 -0800
commitf318322990f13f251a650209f541546faec03a19 (patch)
tree2faa49808d3b2a105aa30e060f791affb92c06ab
parent45ed93deefc42db6c0cf3154f50f5f6404d7ecf5 (diff)
downloadlwn-f318322990f13f251a650209f541546faec03a19.tar.gz
lwn-f318322990f13f251a650209f541546faec03a19.zip
ACPI, x86: Use SRAT table rev to use 8bit or 32bit PXM fields (x86/x86-64)
commit cd298f60a2451a16e0f077404bf69b62ec868733 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. x86/x86-64 was rather inconsistent prior to this patch; it used 8 bits for the pxm field in cpu_affinity, but 32 bits in mem_affinity. This patch makes it consistent: Either use 8 bits consistently (SRAT rev 1 or lower) or 32 bits (SRAT rev 2 or higher). cc: x86@kernel.org 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--arch/x86/mm/srat.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
index 81dbfdeb080d..7efd0c615d58 100644
--- a/arch/x86/mm/srat.c
+++ b/arch/x86/mm/srat.c
@@ -104,6 +104,8 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
return;
pxm = pa->proximity_domain_lo;
+ if (acpi_srat_revision >= 2)
+ pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
node = setup_node(pxm);
if (node < 0) {
printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
@@ -155,6 +157,8 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
start = ma->base_address;
end = start + ma->length;
pxm = ma->proximity_domain;
+ if (acpi_srat_revision <= 1)
+ pxm &= 0xff;
node = setup_node(pxm);
if (node < 0) {
printk(KERN_ERR "SRAT: Too many proximity domains.\n");