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-rw-r--r--init/Kconfig38
-rw-r--r--init/main.c18
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") ||