diff options
Diffstat (limited to 'arch/um/Kconfig')
| -rw-r--r-- | arch/um/Kconfig | 53 |
1 files changed, 44 insertions, 9 deletions
diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 49781bee7905..8415d39b0d43 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -5,6 +5,7 @@ menu "UML-specific options" config UML bool default y + select ARCH_DISABLE_KASAN_INLINE if STATIC_LINK select ARCH_NEEDS_DEFER_KASAN if STATIC_LINK select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_HAS_CACHE_LINE_SIZE @@ -28,6 +29,7 @@ config UML select OF_EARLY_FLATTREE if OF select GENERIC_IRQ_SHOW select GENERIC_CPU_DEVICES + select GENERIC_SMP_IDLE_THREAD select HAVE_GCC_PLUGINS select ARCH_SUPPORTS_LTO_CLANG select ARCH_SUPPORTS_LTO_CLANG_THIN @@ -81,10 +83,48 @@ config HZ int default 100 -config NR_CPUS +config UML_SUBARCH_SUPPORTS_SMP + bool + +config SMP + bool "Symmetric multi-processing support" + default n + depends on UML_SUBARCH_SUPPORTS_SMP + help + This option enables UML SMP support. + + With this enabled, users can tell UML to start multiple virtual + processors. Each virtual processor is represented as a separate + host thread. + + In UML, kthreads and normal threads (when running in kernel mode) + can be scheduled and executed simultaneously on different virtual + processors. However, the userspace code of normal threads still + runs within their respective single-threaded stubs. + + That is, SMP support is available both within the kernel and + across different processes, but remains limited within threads + of the same process in userspace. + +config NR_CPUS_RANGE_BEGIN int - range 1 1 - default 1 + default 1 if !SMP + default 2 + +config NR_CPUS_RANGE_END + int + default 1 if !SMP + default 64 + +config NR_CPUS_DEFAULT + int + default 1 if !SMP + default 2 + +config NR_CPUS + int "Maximum number of CPUs" if SMP + range NR_CPUS_RANGE_BEGIN NR_CPUS_RANGE_END + default NR_CPUS_DEFAULT source "arch/$(HEADER_ARCH)/um/Kconfig" @@ -200,12 +240,6 @@ config KERNEL_STACK_ORDER increase in the size of the state which needs to be saved when handling signals. -config MMAPPER - tristate "iomem emulation driver" - help - This driver allows a host file to be used as emulated IO memory inside - UML. - config PGTABLE_LEVELS int default 4 if 64BIT @@ -260,6 +294,7 @@ source "arch/um/drivers/Kconfig" config ARCH_SUSPEND_POSSIBLE def_bool y + depends on !SMP menu "Power management options" |