diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 38 | ||||
| -rw-r--r-- | init/main.c | 18 |
2 files changed, 15 insertions, 41 deletions
diff --git a/init/Kconfig b/init/Kconfig index 643b221b1c0f..f5dbc6d4261b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -470,7 +470,6 @@ choice config TREE_RCU bool "Tree-based hierarchical RCU" depends on !PREEMPT && SMP - select IRQ_WORK help This option selects the RCU implementation that is designed for very large SMP system with hundreds or @@ -480,7 +479,6 @@ config TREE_RCU config PREEMPT_RCU bool "Preemptible tree-based hierarchical RCU" depends on PREEMPT - select IRQ_WORK help This option selects the RCU implementation that is designed for very large SMP systems with hundreds or @@ -501,9 +499,17 @@ config TINY_RCU endchoice +config SRCU + bool + help + This option selects the sleepable version of RCU. This version + permits arbitrary sleeping or blocking within RCU read-side critical + sections. + config TASKS_RCU bool "Task_based RCU implementation using voluntary context switch" default n + select SRCU help This option enables a task-based RCU implementation that uses only voluntary context switch (not preemption!), idle, and @@ -668,9 +674,10 @@ config RCU_BOOST config RCU_KTHREAD_PRIO int "Real-time priority to use for RCU worker threads" - range 1 99 - depends on RCU_BOOST - default 1 + range 1 99 if RCU_BOOST + range 0 99 if !RCU_BOOST + default 1 if RCU_BOOST + default 0 if !RCU_BOOST help This option specifies the SCHED_FIFO priority value that will be assigned to the rcuc/n and rcub/n threads and is also the value @@ -1280,27 +1287,11 @@ source "usr/Kconfig" endif -config INIT_FALLBACK - bool "Fall back to defaults if init= parameter is bad" - default y - help - If enabled, the kernel will try the default init binaries if an - explicit request from the init= parameter fails. - - This can have unexpected effects. For example, booting - with init=/sbin/kiosk_app will run /sbin/init or even /bin/sh - if /sbin/kiosk_app cannot be executed. - - The default value of Y is consistent with historical behavior. - Selecting N is likely to be more appropriate for most uses, - especially on kiosks and on kernels that are intended to be - run under the control of a script. - config CC_OPTIMIZE_FOR_SIZE bool "Optimize for size" help - Enabling this option will pass "-Os" instead of "-O2" to gcc - resulting in a smaller kernel. + Enabling this option will pass "-Os" instead of "-O2" to + your compiler resulting in a smaller kernel. If unsure, say N. @@ -1595,6 +1586,7 @@ config PERF_EVENTS depends on HAVE_PERF_EVENTS select ANON_INODES select IRQ_WORK + select SRCU help Enable kernel support for various performance events provided by software and hardware. diff --git a/init/main.c b/init/main.c index 61b993767db5..6f0f1c5ff8cc 100644 --- a/init/main.c +++ b/init/main.c @@ -87,10 +87,6 @@ #include <asm/sections.h> #include <asm/cacheflush.h> -#ifdef CONFIG_X86_LOCAL_APIC -#include <asm/smp.h> -#endif - static int kernel_init(void *); extern void init_IRQ(void); @@ -351,15 +347,6 @@ __setup("rdinit=", rdinit_setup); #ifndef CONFIG_SMP static const unsigned int setup_max_cpus = NR_CPUS; -#ifdef CONFIG_X86_LOCAL_APIC -static void __init smp_init(void) -{ - APIC_init_uniprocessor(); -} -#else -#define smp_init() do { } while (0) -#endif - static inline void setup_nr_cpu_ids(void) { } static inline void smp_prepare_cpus(unsigned int maxcpus) { } #endif @@ -966,13 +953,8 @@ static int __ref kernel_init(void *unused) ret = run_init_process(execute_command); if (!ret) return 0; -#ifndef CONFIG_INIT_FALLBACK panic("Requested init %s failed (error %d).", execute_command, ret); -#else - pr_err("Failed to execute %s (error %d). Attempting defaults...\n", - execute_command, ret); -#endif } if (!try_to_run_init_process("/sbin/init") || !try_to_run_init_process("/etc/init") || |