config ARCH_HAS_CPU_RELAX
def_bool y
+config ARCH_HAS_DEFAULT_IDLE
+ def_bool y
+
config ARCH_HAS_CACHE_LINE_SIZE
def_bool y
# need this always selected by IOMMU for the VIA workaround
config SWIOTLB
- bool
+ def_bool y if X86_64
help
Support for software bounce buffers used on x86-64 systems
which don't have a hardware IOMMU (e.g. the current generation
config IOMMU_HELPER
def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
+
config MAXSMP
bool "Configure Maximum number of SMP Processors and NUMA Nodes"
- depends on X86_64 && SMP
+ depends on X86_64 && SMP && BROKEN
default n
help
Configure maximum number of CPUS and NUMA Nodes for this architecture.
If unsure, say N.
-if MAXSMP
config NR_CPUS
- int
- default "4096"
-endif
-
-if !MAXSMP
-config NR_CPUS
- int "Maximum number of CPUs (2-4096)"
- range 2 4096
+ int "Maximum number of CPUs (2-512)" if !MAXSMP
+ range 2 512
depends on SMP
+ default "4096" if MAXSMP
default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
default "8"
help
This allows you to specify the maximum number of CPUs which this
- kernel will support. The maximum supported value is 4096 and the
+ kernel will support. The maximum supported value is 512 and the
minimum value which makes sense is 2.
This is purely to save memory - each supported CPU adds
approximately eight kilobytes to the kernel image.
-endif
config SCHED_SMT
bool "SMT (Hyperthreading) scheduler support"
local memory controller of the CPU and add some more
NUMA awareness to the kernel.
- For i386 this is currently highly experimental and should be only
+ For 32-bit this is currently highly experimental and should be only
used for kernel development. It might also cause boot failures.
- For x86_64 this is recommended on all multiprocessor Opteron systems.
+ For 64-bit this is recommended on all multiprocessor Opteron systems.
If the system is EM64T, you should say N unless your system is
EM64T NUMA.
into virtual nodes when booted with "numa=fake=N", where N is the
number of nodes. This is only useful for debugging.
-if MAXSMP
-
config NODES_SHIFT
- int
- default "9"
-endif
-
-if !MAXSMP
-config NODES_SHIFT
- int "Maximum NUMA Nodes (as a power of 2)"
+ int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
range 1 9 if X86_64
+ default "9" if MAXSMP
default "6" if X86_64
default "4" if X86_NUMAQ
default "3"
help
Specify the maximum number of NUMA Nodes available on the target
system. Increases memory reserved to accomodate various tables.
-endif
config HAVE_ARCH_BOOTMEM_NODE
def_bool y
low memory. Setting this option will put user-space page table
entries in high memory.
+config X86_RESERVE_LOW_64K
+ bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
+ default y
+ help
+ Reserve the first 64K of physical RAM on BIOSes that are known
+ to potentially corrupt that memory range. A numbers of BIOSes are
+ known to utilize this area during suspend/resume, so it must not
+ be used by the kernel.
+
+ Set this to N if you are absolutely sure that you trust the BIOS
+ to get all its memory reservations and usages right.
+
+ If you have doubts about the BIOS (e.g. suspend/resume does not
+ work or there's kernel crashes after certain hardware hotplug
+ events) and it's not AMI or Phoenix, then you might want to enable
+ X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
+ corruption patterns.
+
+ Say Y if unsure.
+
config MATH_EMULATION
bool
prompt "Math emulation" if X86_32
strongly in flux, so no good recommendation can be made.
config CRASH_DUMP
- bool "kernel crash dumps (EXPERIMENTAL)"
+ bool "kernel crash dumps"
depends on X86_64 || (X86_32 && HIGHMEM)
help
Generate crash dump after being started by kexec.