bool
default y
-config GENERIC_BUST_SPINLOCK
+config GENERIC_HWEIGHT
bool
+ default y
-mainmenu "Linux Kernel Configuration"
-
-config ARCH_S390
+config GENERIC_CALIBRATE_DELAY
bool
default y
-config UID16
+config GENERIC_BUST_SPINLOCK
+ bool
+
+mainmenu "Linux Kernel Configuration"
+
+config S390
bool
default y
- depends on ARCH_S390X = 'n'
source "init/Kconfig"
comment "Processor type and features"
-config ARCH_S390X
+config 64BIT
bool "64 bit kernel"
help
Select this option if you have a 64 bit IBM zSeries machine
and want to use the 64 bit addressing mode.
-config 64BIT
- def_bool ARCH_S390X
-
-config ARCH_S390_31
- bool
- depends on ARCH_S390X = 'n'
- default y
-
-choice
- prompt "Processor type"
- default MARCH_G5
-
-config MARCH_G5
- bool "S/390 model G5 and G6"
- depends on ARCH_S390_31
- help
- Select this to build a 31 bit kernel that works
- on all S/390 and zSeries machines.
-
-config MARCH_Z900
- bool "IBM eServer zSeries model z800 and z900"
- help
- Select this to optimize for zSeries machines. This
- will enable some optimizations that are not available
- on older 31 bit only CPUs.
-
-config MARCH_Z990
- bool "IBM eServer zSeries model z990"
- help
- Select this enable optimizations for model z990.
- This will be slightly faster but does not work on
- older machines such as the z900.
-
-endchoice
-
-
config SMP
bool "Symmetric multi-processing support"
---help---
This is purely to save memory - each supported CPU adds
approximately sixteen kilobytes to the kernel image.
+config HOTPLUG_CPU
+ bool "Support for hot-pluggable CPUs"
+ depends on SMP
+ select HOTPLUG
+ default n
+ help
+ Say Y here to be able to turn CPUs off and on. CPUs
+ can be controlled through /sys/devices/system/cpu/cpu#.
+ Say N if you want to disable CPU hotplug.
+
+config DEFAULT_MIGRATION_COST
+ int
+ default "1000000"
+
config MATHEMU
bool "IEEE FPU emulation"
depends on MARCH_G5
help
This option is required for IEEE compliant floating point arithmetic
- on older S/390 machines. Say Y unless you know your machine doesn't
+ on older S/390 machines. Say Y unless you know your machine doesn't
need this.
-config S390_SUPPORT
+config COMPAT
bool "Kernel support for 31 bit emulation"
- depends on ARCH_S390X
+ depends on 64BIT
help
Select this option if you want to enable your system kernel to
handle system-calls from ELF binaries for 31 bit ESA. This option
(and some other stuff like libraries and such) is needed for
executing 31 bit applications. It is safe to say "Y".
-config COMPAT
- bool
- depends on S390_SUPPORT
- default y
-
config SYSVIPC_COMPAT
bool
depends on COMPAT && SYSVIPC
config BINFMT_ELF32
tristate "Kernel support for 31 bit ELF binaries"
- depends on S390_SUPPORT
+ depends on COMPAT
help
This allows you to run 32-bit Linux/ELF binaries on your zSeries
in 64 bit mode. Everybody wants this; say Y.
+comment "Code generation options"
+
+choice
+ prompt "Processor type"
+ default MARCH_G5
+
+config MARCH_G5
+ bool "S/390 model G5 and G6"
+ depends on !64BIT
+ help
+ Select this to build a 31 bit kernel that works
+ on all S/390 and zSeries machines.
+
+config MARCH_Z900
+ bool "IBM eServer zSeries model z800 and z900"
+ help
+ Select this to optimize for zSeries machines. This
+ will enable some optimizations that are not available
+ on older 31 bit only CPUs.
+
+config MARCH_Z990
+ bool "IBM eServer zSeries model z890 and z990"
+ help
+ Select this enable optimizations for model z890/z990.
+ This will be slightly faster but does not work on
+ older machines such as the z900.
+
+endchoice
+
+config PACK_STACK
+ bool "Pack kernel stack"
+ help
+ This option enables the compiler option -mkernel-backchain if it
+ is available. If the option is available the compiler supports
+ the new stack layout which dramatically reduces the minimum stack
+ frame size. With an old compiler a non-leaf function needs a
+ minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
+ -mkernel-backchain the minimum size drops to 16 byte on 31 bit
+ and 24 byte on 64 bit.
+
+ Say Y if you are unsure.
+
+config SMALL_STACK
+ bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
+ depends on PACK_STACK
+ help
+ If you say Y here and the compiler supports the -mkernel-backchain
+ option the kernel will use a smaller kernel stack size. For 31 bit
+ the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
+ instead of 16kb. This allows to run more thread on a system and
+ reduces the pressure on the memory management for higher order
+ page allocations.
+
+ Say N if you are unsure.
+
+
+config CHECK_STACK
+ bool "Detect kernel stack overflow"
+ help
+ This option enables the compiler option -mstack-guard and
+ -mstack-size if they are available. If the compiler supports them
+ it will emit additional code to each function prolog to trigger
+ an illegal operation if the kernel stack is about to overflow.
+
+ Say N if you are unsure.
+
+config STACK_GUARD
+ int "Size of the guard area (128-1024)"
+ range 128 1024
+ depends on CHECK_STACK
+ default "256"
+ help
+ This allows you to specify the size of the guard area at the lower
+ end of the kernel stack. If the kernel stack points into the guard
+ area on function entry an illegal operation is triggered. The size
+ needs to be a power of 2. Please keep in mind that the size of an
+ interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
+ The minimum size for the stack guard should be 256 for 31 bit and
+ 512 for 64 bit.
+
+config WARN_STACK
+ bool "Emit compiler warnings for function with broken stack usage"
+ help
+ This option enables the compiler options -mwarn-framesize and
+ -mwarn-dynamicstack. If the compiler supports these options it
+ will generate warnings for function which either use alloca or
+ create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
+
+ Say N if you are unsure.
+
+config WARN_STACK_SIZE
+ int "Maximum frame size considered safe (128-2048)"
+ range 128 2048
+ depends on WARN_STACK
+ default "256"
+ help
+ This allows you to specify the maximum frame size a function may
+ have without the compiler complaining about it.
+
+source "mm/Kconfig"
+
comment "I/O subsystem configuration"
config MACHCHK_WARNING
bool "Process warning machine checks"
help
Select this option if you want the machine check handler on IBM S/390 or
- zSeries to process warning machine checks (e.g. on power failures).
+ zSeries to process warning machine checks (e.g. on power failures).
If unsure, say "Y".
config QDIO
tristate "QDIO support"
---help---
- This driver provides the Queued Direct I/O base support for the
- IBM S/390 (G5 and G6) and eServer zSeries (z800, z900 and z990).
+ This driver provides the Queued Direct I/O base support for
+ IBM mainframes.
For details please refer to the documentation provided by IBM at
<http://www10.software.ibm.com/developerworks/opensource/linux390>
If unsure, say N.
+config QDIO_DEBUG
+ bool "Extended debugging information"
+ depends on QDIO
+ help
+ Say Y here to get extended debugging output in
+ /sys/kernel/debug/s390dbf/qdio...
+ Warning: this option reduces the performance of the QDIO module.
+
+ If unsure, say N.
+
comment "Misc"
config PREEMPT
This provides a kernel interface for virtual CPU timers.
Default is disabled.
+config VIRT_CPU_ACCOUNTING
+ bool "Base user process accounting on virtual cpu timer"
+ depends on VIRT_TIMER
+ help
+ Select this option to use CPU timer deltas to do user
+ process accounting.
+
config APPLDATA_BASE
bool "Linux - VM Monitor Stream, base infrastructure"
depends on PROC_FS && VIRT_TIMER=y
The HZ timer is switched off in idle by default. That means the
HZ timer is already disabled at boot time.
+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 is independent of hardware/microcode support.
+
endmenu
+source "net/Kconfig"
+
config PCMCIA
bool
default n
source "drivers/base/Kconfig"
+source "drivers/connector/Kconfig"
+
source "drivers/scsi/Kconfig"
source "drivers/s390/Kconfig"
-source "net/Kconfig"
+source "drivers/net/Kconfig"
source "fs/Kconfig"
source "arch/s390/oprofile/Kconfig"
-menu "Kernel hacking"
-
-config DEBUG_KERNEL
- bool "Kernel debugging"
- help
- Say Y here if you are developing drivers or trying to debug and
- identify kernel problems.
-
-config MAGIC_SYSRQ
- bool "Magic SysRq key"
- depends on DEBUG_KERNEL
- help
- If you say Y here, you will have some control over the system even
- if the system crashes for example during kernel debugging (e.g., you
- will be able to flush the buffer cache to disk, reboot the system
- immediately or dump some status information). This is accomplished
- by pressing various keys while holding SysRq (Alt+PrintScreen). It
- also works on a serial console (on PC hardware at least), if you
- send a BREAK and then within 5 seconds a command keypress. The
- keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
- unless you really know what this hack does.
+source "arch/s390/Kconfig.debug"
-config DEBUG_SLAB
- bool "Debug memory allocations"
- depends on DEBUG_KERNEL
- help
- Say Y here to have the kernel do limited verification on memory
- allocation as well as poisoning memory on free to catch use of freed
- memory.
-
-config KALLSYMS
- bool "Load all symbols for debugging/kksymoops"
- depends on DEBUG_KERNEL
- help
- Say Y here to let the kernel print out symbolic crash information and
- symbolic stack backtraces. This increases the size of the kernel
- somewhat, as all symbols have to be loaded into the kernel image.
-
-config DEBUG_INFO
- bool "Compile the kernel with debug info"
- depends on DEBUG_KERNEL
- help
- If you say Y here the resulting kernel image will include
- debugging info resulting in a larger kernel image.
- Say Y here only if you plan to use gdb to debug the kernel.
- If you don't debug the kernel, you can say N.
-
-config DEBUG_SPINLOCK_SLEEP
- bool "Sleep-inside-spinlock checking"
- help
- If you say Y here, various routines which may sleep will become very
- noisy if they are called with a spinlock held.
-
-endmenu
+source "kernel/vserver/Kconfig"
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"
-
git://git.onelab.eu / linux-2.6.git / blobdiff