bool
default y
+config ARCH_HAS_ILOG2_U32
+ bool
+ default n
+
+config ARCH_HAS_ILOG2_U64
+ bool
+ default n
+
config GENERIC_HWEIGHT
bool
default y
config GENERIC_TIME
def_bool y
-config GENERIC_BUST_SPINLOCK
- bool
-
mainmenu "Linux Kernel Configuration"
config S390
bool
default y
+config S390_SWITCH_AMODE
+ bool "Switch kernel/user addressing modes"
+ help
+ This option allows to switch the addressing modes of kernel and user
+ space. The kernel parameter switch_amode=on will enable this feature,
+ default is disabled. Enabling this (via kernel parameter) on machines
+ earlier than IBM System z9-109 EC/BC will reduce system performance.
+
+ Note that this option will also be selected by selecting the execute
+ protection option below. Enabling the execute protection via the
+ noexec kernel parameter will also switch the addressing modes,
+ independent of the switch_amode kernel parameter.
+
+
+config S390_EXEC_PROTECT
+ bool "Data execute protection"
+ select S390_SWITCH_AMODE
+ help
+ This option allows to enable a buffer overflow protection for user
+ space programs and it also selects the addressing mode option above.
+ The kernel parameter noexec=on will enable this feature and also
+ switch the addressing modes, default is disabled. Enabling this (via
+ kernel parameter) on machines earlier than IBM System z9-109 EC/BC
+ will reduce system performance.
+
comment "Code generation options"
choice
config SMALL_STACK
bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
- depends on PACK_STACK
+ depends on PACK_STACK && !LOCKDEP
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
This allows you to specify the maximum frame size a function may
have without the compiler complaining about it.
+config ARCH_POPULATES_NODE_MAP
+ def_bool y
+
source "mm/Kconfig"
+config HOLES_IN_ZONE
+ def_bool y
+
comment "I/O subsystem configuration"
config MACHCHK_WARNING
If unsure, say Y.
-config QDIO_PERF_STATS
- bool "Performance statistics in /proc"
- depends on QDIO
- help
- Say Y here to get performance statistics in /proc/qdio_perf
-
- If unsure, say N.
-
config QDIO_DEBUG
bool "Extended debugging information"
depends on QDIO
config APPLDATA_MEM
tristate "Monitor memory management statistics"
- depends on APPLDATA_BASE
+ depends on APPLDATA_BASE && VM_EVENT_COUNTERS
help
This provides memory management related data to the Linux - VM Monitor
Stream, like paging/swapping rate, memory utilisation, etc.