diff options
Diffstat (limited to 'arch/x86_64/Kconfig')
| -rw-r--r-- | arch/x86_64/Kconfig | 98 |
1 files changed, 69 insertions, 29 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index 289f448ac89c..660a03a89e66 100644 --- a/arch/x86_64/Kconfig +++ b/arch/x86_64/Kconfig @@ -207,33 +207,6 @@ config SMP If you don't know what to do here, say N. -config PREEMPT - bool "Preemptible Kernel" - ---help--- - This option reduces the latency of the kernel when reacting to - real-time or interactive events by allowing a low priority process to - be preempted even if it is in kernel mode executing a system call. - This allows applications to run more reliably even when the system is - under load. On contrary it may also break your drivers and add - priority inheritance problems to your system. Don't select it if - you rely on a stable system or have slightly obscure hardware. - It's also not very well tested on x86-64 currently. - You have been warned. - - Say Y here if you are feeling brave and building a kernel for a - desktop, embedded or real-time system. Say N if you are unsure. - -config PREEMPT_BKL - bool "Preempt The Big Kernel Lock" - depends on PREEMPT - default y - help - This option reduces the latency of the kernel by making the - big kernel lock preemptible. - - Say Y here if you are building a kernel for a desktop system. - Say N if you are unsure. - config SCHED_SMT bool "SMT (Hyperthreading) scheduler support" depends on SMP @@ -244,6 +217,8 @@ config SCHED_SMT cost of slightly increased overhead in some places. If unsure say N here. +source "kernel/Kconfig.preempt" + config K8_NUMA bool "K8 NUMA support" select NUMA @@ -265,7 +240,7 @@ config NUMA_EMU into virtual nodes when booted with "numa=fake=N", where N is the number of nodes. This is only useful for debugging. -config DISCONTIGMEM +config ARCH_DISCONTIGMEM_ENABLE bool depends on NUMA default y @@ -274,6 +249,27 @@ config NUMA bool default n +config ARCH_DISCONTIGMEM_ENABLE + def_bool y + depends on NUMA + +config ARCH_DISCONTIGMEM_DEFAULT + def_bool y + depends on NUMA + +config ARCH_SPARSEMEM_ENABLE + def_bool y + depends on NUMA + +config ARCH_FLATMEM_ENABLE + def_bool y + depends on !NUMA + +source "mm/Kconfig" + +config HAVE_ARCH_EARLY_PFN_TO_NID + def_bool y + config HAVE_DEC_LOCK bool depends on SMP @@ -292,6 +288,15 @@ config NR_CPUS This is purely to save memory - each supported CPU requires memory in the static kernel configuration. +config HOTPLUG_CPU + bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" + depends on SMP && HOTPLUG && EXPERIMENTAL + help + Say Y here to experiment with turning CPUs off and on. CPUs + can be controlled through /sys/devices/system/cpu/cpu#. + Say N if you want to disable CPU hotplug. + + config HPET_TIMER bool default y @@ -324,12 +329,15 @@ config HPET_EMULATE_RTC config GART_IOMMU bool "IOMMU support" + default y depends on PCI help - Support the K8 IOMMU. Needed to run systems with more than 4GB of memory + Support the 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 + and a software emulation used on some other systems. If unsure, say Y. # need this always enabled with GART_IOMMU for the VIA workaround @@ -364,6 +372,34 @@ config X86_MCE_INTEL Additional support for intel specific MCE features such as the thermal monitor. +config PHYSICAL_START + hex "Physical address where the kernel is loaded" if EMBEDDED + default "0x100000" + help + This gives the physical address where the kernel is loaded. + Primarily used in the case of kexec on panic where the + fail safe kernel needs to run at a different address than + the panic-ed kernel. + + Don't change this unless you know what you are doing. + +config KEXEC + bool "kexec system call (EXPERIMENTAL)" + depends on EXPERIMENTAL + help + kexec is a system call that implements the ability to shutdown your + current kernel, and to start another kernel. It is like a reboot + but it is indepedent of the system firmware. And like a reboot + you can start any kernel with it, not just Linux. + + The name comes from the similiarity to the exec system call. + + It is an ongoing process to be certain the hardware in a machine + is properly shutdown, so do not be surprised if this code does not + initially work for you. It may help to enable device hotplugging + support. As of this writing the exact hardware interface is + strongly in flux, so no good recommendation can be made. + config SECCOMP bool "Enable seccomp to safely compute untrusted bytecode" depends on PROC_FS @@ -381,6 +417,8 @@ config SECCOMP If unsure, say Y. Only embedded should say N here. +source kernel/Kconfig.hz + endmenu # @@ -480,6 +518,8 @@ config UID16 endmenu +source "net/Kconfig" + source drivers/Kconfig source "drivers/firmware/Kconfig" |