From: Kurt Garloff Date: Tue, 17 Jan 2012 09:20:31 +0000 (-0500) Subject: ACPI, x86: Use SRAT table rev to use 8bit or 32bit PXM fields (x86/x86-64) X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cd298f60a2451a16e0f077404bf69b62ec868733;p=linux-beck.git ACPI, x86: Use SRAT table rev to use 8bit or 32bit PXM fields (x86/x86-64) 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 Signed-off-by: Len Brown --- 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");