[PATCH] x86_64: reliable stack trace support (x86-64)

[powerpc.git] / arch / x86_64 / Kconfig

diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 408d44a..e8c52a1 100644 (file)
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -299,6 +299,7 @@ config X86_64_ACPI_NUMA
        bool "ACPI NUMA detection"
        depends on NUMA
        select ACPI 
+       select PCI
        select ACPI_NUMA
        default y
        help
@@ -385,27 +386,28 @@ config HPET_EMULATE_RTC
        bool "Provide RTC interrupt"
        depends on HPET_TIMER && RTC=y
 
-config GART_IOMMU
-       bool "K8 GART IOMMU support"
+# Mark as embedded because too many people got it wrong.
+# The code disables itself when not needed.
+config IOMMU
+       bool "IOMMU support" if EMBEDDED
        default y
        select SWIOTLB
+       select AGP
        depends on PCI
        help
-         Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors
-         and for the bounce buffering software IOMMU.
-         Needed to run systems with more than 3GB of memory properly with
-         32-bit PCI devices that do not support DAC (Double Address Cycle).
-         The IOMMU can be turned off at runtime with the iommu=off parameter.
-         Normally the kernel will take the right choice by itself.
-         This option includes a driver for the AMD Opteron/Athlon64 IOMMU
-         northbridge and a software emulation used on other systems without
-         hardware IOMMU.  If unsure, say Y.
-
-# need this always enabled with GART_IOMMU for the VIA workaround
+         Support for full DMA access of devices with 32bit memory access only
+         on systems with more than 3GB. This is usually needed for USB,
+         sound, many IDE/SATA chipsets and some other devices.
+         Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
+         based IOMMU and a software bounce buffer based IOMMU used on Intel
+         systems and as fallback.
+         The code is only active when needed (enough memory and limited
+         device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
+         too.
+
+# need this always selected by IOMMU for the VIA workaround
 config SWIOTLB
        bool
-       default y
-       depends on GART_IOMMU
 
 config X86_MCE
        bool "Machine check support" if EMBEDDED
@@ -501,6 +503,10 @@ config REORDER
          optimal TLB usage. If you have pretty much any version of binutils, 
         this can increase your kernel build time by roughly one minute.
 
+config K8_NB
+       def_bool y
+       depends on AGP_AMD64 || IOMMU || (PCI && NUMA)
+
 endmenu
 
 #