diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 38 | ||||
| -rw-r--r-- | init/main.c | 3 |
2 files changed, 33 insertions, 8 deletions
diff --git a/init/Kconfig b/init/Kconfig index 950ba26f723..bd125a79537 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -21,6 +21,13 @@ config CONSTRUCTORS depends on !UML default y +config HAVE_IRQ_WORK + bool + +config IRQ_WORK + bool + depends on HAVE_IRQ_WORK + menu "General setup" config EXPERIMENTAL @@ -64,7 +71,7 @@ config BROKEN_ON_SMP config LOCK_KERNEL bool - depends on SMP || PREEMPT + depends on (SMP || PREEMPT) && BKL default y config INIT_ENV_ARG_LIMIT @@ -332,6 +339,8 @@ config AUDIT_TREE depends on AUDITSYSCALL select FSNOTIFY +source "kernel/irq/Kconfig" + menu "RCU Subsystem" choice @@ -340,6 +349,7 @@ choice config TREE_RCU bool "Tree-based hierarchical RCU" + depends on !PREEMPT && SMP help This option selects the RCU implementation that is designed for very large SMP system with hundreds or @@ -347,7 +357,7 @@ config TREE_RCU smaller systems. config TREE_PREEMPT_RCU - bool "Preemptable tree-based hierarchical RCU" + bool "Preemptible tree-based hierarchical RCU" depends on PREEMPT help This option selects the RCU implementation that is @@ -365,8 +375,22 @@ config TINY_RCU is not required. This option greatly reduces the memory footprint of RCU. +config TINY_PREEMPT_RCU + bool "Preemptible UP-only small-memory-footprint RCU" + depends on !SMP && PREEMPT + help + This option selects the RCU implementation that is designed + for real-time UP systems. This option greatly reduces the + memory footprint of RCU. + endchoice +config PREEMPT_RCU + def_bool ( TREE_PREEMPT_RCU || TINY_PREEMPT_RCU ) + help + This option enables preemptible-RCU code that is common between + the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations. + config RCU_TRACE bool "Enable tracing for RCU" depends on TREE_RCU || TREE_PREEMPT_RCU @@ -387,9 +411,12 @@ config RCU_FANOUT help This option controls the fanout of hierarchical implementations of RCU, allowing RCU to work efficiently on machines with - large numbers of CPUs. This value must be at least the cube - root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit - systems and up to 262,144 for 64-bit systems. + large numbers of CPUs. This value must be at least the fourth + root of NR_CPUS, which allows NR_CPUS to be insanely large. + The default value of RCU_FANOUT should be used for production + systems, but if you are stress-testing the RCU implementation + itself, small RCU_FANOUT values allow you to test large-system + code paths on small(er) systems. Select a specific number if testing RCU itself. Take the default if unsure. @@ -990,6 +1017,7 @@ config PERF_EVENTS default y if (PROFILING || PERF_COUNTERS) depends on HAVE_PERF_EVENTS select ANON_INODES + select IRQ_WORK help Enable kernel support for various performance events provided by software and hardware. diff --git a/init/main.c b/init/main.c index 94ab488039a..e59af24a0b7 100644 --- a/init/main.c +++ b/init/main.c @@ -424,7 +424,6 @@ static void __init setup_command_line(char *command_line) static __initdata DECLARE_COMPLETION(kthreadd_done); static noinline void __init_refok rest_init(void) - __releases(kernel_lock) { int pid; @@ -556,7 +555,6 @@ asmlinkage void __init start_kernel(void) local_irq_disable(); early_boot_irqs_off(); - early_init_irq_lock_class(); /* * Interrupts are still disabled. Do necessary setups, then @@ -819,7 +817,6 @@ static void run_init_process(const char *init_filename) * makes it inline to init() and it becomes part of init.text section */ static noinline int init_post(void) - __releases(kernel_lock) { /* need to finish all async __init code before freeing the memory */ async_synchronize_full(); |