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rcu: Move RCU-related source code to kernel/rcu directory

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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Paul E. McKenney 2013-10-08 20:23:47 -07:00
parent 2529973309
commit 4102adab91
15 changed files with 105 additions and 62 deletions
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5
Documentation/DocBook/device-drivers.tmpl
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@ -87,7 +87,10 @@ X!Iinclude/linux/kobject.h
!Ekernel/printk/printk.c !Ekernel/printk/printk.c
!Ekernel/panic.c !Ekernel/panic.c
!Ekernel/sys.c !Ekernel/sys.c
!Ekernel/rcupdate.c !Ekernel/rcu/srcu.c
!Ekernel/rcu/tree.c
!Ekernel/rcu/tree_plugin.h
!Ekernel/rcu/update.c
</sect1> </sect1>
<sect1><title>Device Resource Management</title> <sect1><title>Device Resource Management</title>

95
Documentation/kernel-parameters.txt
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@ -2595,7 +2595,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
ramdisk_size= [RAM] Sizes of RAM disks in kilobytes ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
See Documentation/blockdev/ramdisk.txt. See Documentation/blockdev/ramdisk.txt.
rcu_nocbs= [KNL,BOOT] rcu_nocbs= [KNL]
In kernels built with CONFIG_RCU_NOCB_CPU=y, set In kernels built with CONFIG_RCU_NOCB_CPU=y, set
the specified list of CPUs to be no-callback CPUs. the specified list of CPUs to be no-callback CPUs.
Invocation of these CPUs' RCU callbacks will Invocation of these CPUs' RCU callbacks will
@ -2608,7 +2608,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
real-time workloads. It can also improve energy real-time workloads. It can also improve energy
efficiency for asymmetric multiprocessors. efficiency for asymmetric multiprocessors.
rcu_nocb_poll [KNL,BOOT] rcu_nocb_poll [KNL]
Rather than requiring that offloaded CPUs Rather than requiring that offloaded CPUs
(specified by rcu_nocbs= above) explicitly (specified by rcu_nocbs= above) explicitly
awaken the corresponding "rcuoN" kthreads, awaken the corresponding "rcuoN" kthreads,
@ -2619,126 +2619,145 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
energy efficiency by requiring that the kthreads energy efficiency by requiring that the kthreads
periodically wake up to do the polling. periodically wake up to do the polling.
rcutree.blimit= [KNL,BOOT] rcutree.blimit= [KNL]
Set maximum number of finished RCU callbacks to process Set maximum number of finished RCU callbacks to process
in one batch. in one batch.
rcutree.fanout_leaf= [KNL,BOOT] rcutree.rcu_fanout_leaf= [KNL]
Increase the number of CPUs assigned to each Increase the number of CPUs assigned to each
leaf rcu_node structure. Useful for very large leaf rcu_node structure. Useful for very large
systems. systems.
rcutree.jiffies_till_first_fqs= [KNL,BOOT] rcutree.jiffies_till_first_fqs= [KNL]
Set delay from grace-period initialization to Set delay from grace-period initialization to
first attempt to force quiescent states. first attempt to force quiescent states.
Units are jiffies, minimum value is zero, Units are jiffies, minimum value is zero,
and maximum value is HZ. and maximum value is HZ.
rcutree.jiffies_till_next_fqs= [KNL,BOOT] rcutree.jiffies_till_next_fqs= [KNL]
Set delay between subsequent attempts to force Set delay between subsequent attempts to force
quiescent states. Units are jiffies, minimum quiescent states. Units are jiffies, minimum
value is one, and maximum value is HZ. value is one, and maximum value is HZ.
rcutree.qhimark= [KNL,BOOT] rcutree.qhimark= [KNL]
Set threshold of queued Set threshold of queued
RCU callbacks over which batch limiting is disabled. RCU callbacks over which batch limiting is disabled.
rcutree.qlowmark= [KNL,BOOT] rcutree.qlowmark= [KNL]
Set threshold of queued RCU callbacks below which Set threshold of queued RCU callbacks below which
batch limiting is re-enabled. batch limiting is re-enabled.
rcutree.rcu_cpu_stall_suppress= [KNL,BOOT] rcutree.rcu_idle_gp_delay= [KNL]
Suppress RCU CPU stall warning messages.
rcutree.rcu_cpu_stall_timeout= [KNL,BOOT]
Set timeout for RCU CPU stall warning messages.
rcutree.rcu_idle_gp_delay= [KNL,BOOT]
Set wakeup interval for idle CPUs that have Set wakeup interval for idle CPUs that have
RCU callbacks (RCU_FAST_NO_HZ=y). RCU callbacks (RCU_FAST_NO_HZ=y).
rcutree.rcu_idle_lazy_gp_delay= [KNL,BOOT] rcutree.rcu_idle_lazy_gp_delay= [KNL]
Set wakeup interval for idle CPUs that have Set wakeup interval for idle CPUs that have
only "lazy" RCU callbacks (RCU_FAST_NO_HZ=y). only "lazy" RCU callbacks (RCU_FAST_NO_HZ=y).
Lazy RCU callbacks are those which RCU can Lazy RCU callbacks are those which RCU can
prove do nothing more than free memory. prove do nothing more than free memory.
rcutorture.fqs_duration= [KNL,BOOT] rcutorture.fqs_duration= [KNL]
Set duration of force_quiescent_state bursts. Set duration of force_quiescent_state bursts.
rcutorture.fqs_holdoff= [KNL,BOOT] rcutorture.fqs_holdoff= [KNL]
Set holdoff time within force_quiescent_state bursts. Set holdoff time within force_quiescent_state bursts.
rcutorture.fqs_stutter= [KNL,BOOT] rcutorture.fqs_stutter= [KNL]
Set wait time between force_quiescent_state bursts. Set wait time between force_quiescent_state bursts.
rcutorture.irqreader= [KNL,BOOT] rcutorture.gp_exp= [KNL]
Test RCU readers from irq handlers. Use expedited update-side primitives.
rcutorture.n_barrier_cbs= [KNL,BOOT] rcutorture.gp_normal= [KNL]
Use normal (non-expedited) update-side primitives.
If both gp_exp and gp_normal are set, do both.
If neither gp_exp nor gp_normal are set, still
do both.
rcutorture.n_barrier_cbs= [KNL]
Set callbacks/threads for rcu_barrier() testing. Set callbacks/threads for rcu_barrier() testing.
rcutorture.nfakewriters= [KNL,BOOT] rcutorture.nfakewriters= [KNL]
Set number of concurrent RCU writers. These just Set number of concurrent RCU writers. These just
stress RCU, they don't participate in the actual stress RCU, they don't participate in the actual
test, hence the "fake". test, hence the "fake".
rcutorture.nreaders= [KNL,BOOT] rcutorture.nreaders= [KNL]
Set number of RCU readers. Set number of RCU readers.
rcutorture.onoff_holdoff= [KNL,BOOT] rcutorture.object_debug= [KNL]
Enable debug-object double-call_rcu() testing.
rcutorture.onoff_holdoff= [KNL]
Set time (s) after boot for CPU-hotplug testing. Set time (s) after boot for CPU-hotplug testing.
rcutorture.onoff_interval= [KNL,BOOT] rcutorture.onoff_interval= [KNL]
Set time (s) between CPU-hotplug operations, or Set time (s) between CPU-hotplug operations, or
zero to disable CPU-hotplug testing. zero to disable CPU-hotplug testing.
rcutorture.shuffle_interval= [KNL,BOOT] rcutorture.rcutorture_runnable= [BOOT]
Start rcutorture running at boot time.
rcutorture.shuffle_interval= [KNL]
Set task-shuffle interval (s). Shuffling tasks Set task-shuffle interval (s). Shuffling tasks
allows some CPUs to go into dyntick-idle mode allows some CPUs to go into dyntick-idle mode
during the rcutorture test. during the rcutorture test.
rcutorture.shutdown_secs= [KNL,BOOT] rcutorture.shutdown_secs= [KNL]
Set time (s) after boot system shutdown. This Set time (s) after boot system shutdown. This
is useful for hands-off automated testing. is useful for hands-off automated testing.
rcutorture.stall_cpu= [KNL,BOOT] rcutorture.stall_cpu= [KNL]
Duration of CPU stall (s) to test RCU CPU stall Duration of CPU stall (s) to test RCU CPU stall
warnings, zero to disable. warnings, zero to disable.
rcutorture.stall_cpu_holdoff= [KNL,BOOT] rcutorture.stall_cpu_holdoff= [KNL]
Time to wait (s) after boot before inducing stall. Time to wait (s) after boot before inducing stall.
rcutorture.stat_interval= [KNL,BOOT] rcutorture.stat_interval= [KNL]
Time (s) between statistics printk()s. Time (s) between statistics printk()s.
rcutorture.stutter= [KNL,BOOT] rcutorture.stutter= [KNL]
Time (s) to stutter testing, for example, specifying Time (s) to stutter testing, for example, specifying
five seconds causes the test to run for five seconds, five seconds causes the test to run for five seconds,
wait for five seconds, and so on. This tests RCU's wait for five seconds, and so on. This tests RCU's
ability to transition abruptly to and from idle. ability to transition abruptly to and from idle.
rcutorture.test_boost= [KNL,BOOT] rcutorture.test_boost= [KNL]
Test RCU priority boosting? 0=no, 1=maybe, 2=yes. Test RCU priority boosting? 0=no, 1=maybe, 2=yes.
"Maybe" means test if the RCU implementation "Maybe" means test if the RCU implementation
under test support RCU priority boosting. under test support RCU priority boosting.
rcutorture.test_boost_duration= [KNL,BOOT] rcutorture.test_boost_duration= [KNL]
Duration (s) of each individual boost test. Duration (s) of each individual boost test.
rcutorture.test_boost_interval= [KNL,BOOT] rcutorture.test_boost_interval= [KNL]
Interval (s) between each boost test. Interval (s) between each boost test.
rcutorture.test_no_idle_hz= [KNL,BOOT] rcutorture.test_no_idle_hz= [KNL]
Test RCU's dyntick-idle handling. See also the Test RCU's dyntick-idle handling. See also the
rcutorture.shuffle_interval parameter. rcutorture.shuffle_interval parameter.
rcutorture.torture_type= [KNL,BOOT] rcutorture.torture_type= [KNL]
Specify the RCU implementation to test. Specify the RCU implementation to test.
rcutorture.verbose= [KNL,BOOT] rcutorture.verbose= [KNL]
Enable additional printk() statements. Enable additional printk() statements.
rcupdate.rcu_expedited= [KNL]
Use expedited grace-period primitives, for
example, synchronize_rcu_expedited() instead
of synchronize_rcu(). This reduces latency,
but can increase CPU utilization, degrade
real-time latency, and degrade energy efficiency.
rcupdate.rcu_cpu_stall_suppress= [KNL]
Suppress RCU CPU stall warning messages.
rcupdate.rcu_cpu_stall_timeout= [KNL]
Set timeout for RCU CPU stall warning messages.
rdinit= [KNL] rdinit= [KNL]
Format: <full_path> Format: <full_path>
Run specified binary instead of /init from the ramdisk, Run specified binary instead of /init from the ramdisk,

11
MAINTAINERS
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@ -6903,7 +6903,7 @@ M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
S: Supported S: Supported
T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
F: Documentation/RCU/torture.txt F: Documentation/RCU/torture.txt
F: kernel/rcutorture.c F: kernel/rcu/torture.c
RDC R-321X SoC RDC R-321X SoC
M: Florian Fainelli <florian@openwrt.org> M: Florian Fainelli <florian@openwrt.org>
@ -6930,8 +6930,9 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
F: Documentation/RCU/ F: Documentation/RCU/
X: Documentation/RCU/torture.txt X: Documentation/RCU/torture.txt
F: include/linux/rcu* F: include/linux/rcu*
F: kernel/rcu* X: include/linux/srcu.h
X: kernel/rcutorture.c F: kernel/rcu/
X: kernel/rcu/torture.c
REAL TIME CLOCK (RTC) SUBSYSTEM REAL TIME CLOCK (RTC) SUBSYSTEM
M: Alessandro Zummo <a.zummo@towertech.it> M: Alessandro Zummo <a.zummo@towertech.it>
@ -7618,8 +7619,8 @@ M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
W: http://www.rdrop.com/users/paulmck/RCU/ W: http://www.rdrop.com/users/paulmck/RCU/
S: Supported S: Supported
T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
F: include/linux/srcu* F: include/linux/srcu.h
F: kernel/srcu* F: kernel/rcu/srcu.c
SMACK SECURITY MODULE SMACK SECURITY MODULE
M: Casey Schaufler <casey@schaufler-ca.com> M: Casey Schaufler <casey@schaufler-ca.com>

11
kernel/Makefile
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@ -6,9 +6,9 @@ obj-y = fork.o exec_domain.o panic.o \
cpu.o exit.o itimer.o time.o softirq.o resource.o \ cpu.o exit.o itimer.o time.o softirq.o resource.o \
sysctl.o sysctl_binary.o capability.o ptrace.o timer.o user.o \ sysctl.o sysctl_binary.o capability.o ptrace.o timer.o user.o \
signal.o sys.o kmod.o workqueue.o pid.o task_work.o \ signal.o sys.o kmod.o workqueue.o pid.o task_work.o \
rcupdate.o extable.o params.o posix-timers.o \ extable.o params.o posix-timers.o \
kthread.o wait.o sys_ni.o posix-cpu-timers.o mutex.o \ kthread.o wait.o sys_ni.o posix-cpu-timers.o mutex.o \
hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \ hrtimer.o rwsem.o nsproxy.o semaphore.o \
notifier.o ksysfs.o cred.o reboot.o \ notifier.o ksysfs.o cred.o reboot.o \
async.o range.o groups.o lglock.o smpboot.o async.o range.o groups.o lglock.o smpboot.o
@ -27,6 +27,7 @@ obj-y += power/
obj-y += printk/ obj-y += printk/
obj-y += cpu/ obj-y += cpu/
obj-y += irq/ obj-y += irq/
obj-y += rcu/
obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o
obj-$(CONFIG_FREEZER) += freezer.o obj-$(CONFIG_FREEZER) += freezer.o
@ -81,12 +82,6 @@ obj-$(CONFIG_KGDB) += debug/
obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
obj-$(CONFIG_SECCOMP) += seccomp.o obj-$(CONFIG_SECCOMP) += seccomp.o
obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
obj-$(CONFIG_TREE_RCU) += rcutree.o
obj-$(CONFIG_TREE_PREEMPT_RCU) += rcutree.o
obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o
obj-$(CONFIG_TINY_RCU) += rcutiny.o
obj-$(CONFIG_TINY_PREEMPT_RCU) += rcutiny.o
obj-$(CONFIG_RELAY) += relay.o obj-$(CONFIG_RELAY) += relay.o
obj-$(CONFIG_SYSCTL) += utsname_sysctl.o obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o

6
kernel/rcu/Makefile Normal file
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@ -0,0 +1,6 @@
obj-y += update.o srcu.o
obj-$(CONFIG_RCU_TORTURE_TEST) += torture.o
obj-$(CONFIG_TREE_RCU) += tree.o
obj-$(CONFIG_TREE_PREEMPT_RCU) += tree.o
obj-$(CONFIG_TREE_RCU_TRACE) += tree_trace.o
obj-$(CONFIG_TINY_RCU) += tiny.o

0
kernel/rcu.h → kernel/rcu/rcu.h
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0
kernel/srcu.c → kernel/rcu/srcu.c
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8
kernel/rcutiny.c → kernel/rcu/tiny.c
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@ -43,7 +43,7 @@
#include "rcu.h" #include "rcu.h"
/* Forward declarations for rcutiny_plugin.h. */ /* Forward declarations for tiny_plugin.h. */
struct rcu_ctrlblk; struct rcu_ctrlblk;
static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp); static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp);
static void rcu_process_callbacks(struct softirq_action *unused); static void rcu_process_callbacks(struct softirq_action *unused);
@ -53,7 +53,7 @@ static void __call_rcu(struct rcu_head *head,
static long long rcu_dynticks_nesting = DYNTICK_TASK_EXIT_IDLE; static long long rcu_dynticks_nesting = DYNTICK_TASK_EXIT_IDLE;
#include "rcutiny_plugin.h" #include "tiny_plugin.h"
/* Common code for rcu_idle_enter() and rcu_irq_exit(), see kernel/rcutree.c. */ /* Common code for rcu_idle_enter() and rcu_irq_exit(), see kernel/rcutree.c. */
static void rcu_idle_enter_common(long long newval) static void rcu_idle_enter_common(long long newval)
@ -67,7 +67,7 @@ static void rcu_idle_enter_common(long long newval)
RCU_TRACE(trace_rcu_dyntick(TPS("Start"), RCU_TRACE(trace_rcu_dyntick(TPS("Start"),
rcu_dynticks_nesting, newval)); rcu_dynticks_nesting, newval));
if (!is_idle_task(current)) { if (!is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id()); struct task_struct *idle __maybe_unused = idle_task(smp_processor_id());
RCU_TRACE(trace_rcu_dyntick(TPS("Entry error: not idle task"), RCU_TRACE(trace_rcu_dyntick(TPS("Entry error: not idle task"),
rcu_dynticks_nesting, newval)); rcu_dynticks_nesting, newval));
@ -128,7 +128,7 @@ static void rcu_idle_exit_common(long long oldval)
} }
RCU_TRACE(trace_rcu_dyntick(TPS("End"), oldval, rcu_dynticks_nesting)); RCU_TRACE(trace_rcu_dyntick(TPS("End"), oldval, rcu_dynticks_nesting));
if (!is_idle_task(current)) { if (!is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id()); struct task_struct *idle __maybe_unused = idle_task(smp_processor_id());
RCU_TRACE(trace_rcu_dyntick(TPS("Exit error: not idle task"), RCU_TRACE(trace_rcu_dyntick(TPS("Exit error: not idle task"),
oldval, rcu_dynticks_nesting)); oldval, rcu_dynticks_nesting));

0
kernel/rcutiny_plugin.h → kernel/rcu/tiny_plugin.h
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6
kernel/rcutorture.c → kernel/rcu/torture.c
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@ -52,6 +52,12 @@
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@freedesktop.org>"); MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@freedesktop.org>");
MODULE_ALIAS("rcutorture");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "rcutorture."
static int fqs_duration; static int fqs_duration;
module_param(fqs_duration, int, 0444); module_param(fqs_duration, int, 0444);
MODULE_PARM_DESC(fqs_duration, "Duration of fqs bursts (us), 0 to disable"); MODULE_PARM_DESC(fqs_duration, "Duration of fqs bursts (us), 0 to disable");

13
kernel/rcutree.c → kernel/rcu/tree.c
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@ -41,6 +41,7 @@
#include <linux/export.h> #include <linux/export.h>
#include <linux/completion.h> #include <linux/completion.h>
#include <linux/moduleparam.h> #include <linux/moduleparam.h>
#include <linux/module.h>
#include <linux/percpu.h> #include <linux/percpu.h>
#include <linux/notifier.h> #include <linux/notifier.h>
#include <linux/cpu.h> #include <linux/cpu.h>
@ -56,11 +57,17 @@
#include <linux/ftrace_event.h> #include <linux/ftrace_event.h>
#include <linux/suspend.h> #include <linux/suspend.h>
#include "rcutree.h" #include "tree.h"
#include <trace/events/rcu.h> #include <trace/events/rcu.h>
#include "rcu.h" #include "rcu.h"
MODULE_ALIAS("rcutree");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "rcutree."
/* Data structures. */ /* Data structures. */
static struct lock_class_key rcu_node_class[RCU_NUM_LVLS]; static struct lock_class_key rcu_node_class[RCU_NUM_LVLS];
@ -3298,7 +3305,7 @@ static void __init rcu_init_one(struct rcu_state *rsp,
/* /*
* Compute the rcu_node tree geometry from kernel parameters. This cannot * Compute the rcu_node tree geometry from kernel parameters. This cannot
* replace the definitions in rcutree.h because those are needed to size * replace the definitions in tree.h because those are needed to size
* the ->node array in the rcu_state structure. * the ->node array in the rcu_state structure.
*/ */
static void __init rcu_init_geometry(void) static void __init rcu_init_geometry(void)
@ -3393,4 +3400,4 @@ void __init rcu_init(void)
rcu_cpu_notify(NULL, CPU_UP_PREPARE, (void *)(long)cpu); rcu_cpu_notify(NULL, CPU_UP_PREPARE, (void *)(long)cpu);
} }
#include "rcutree_plugin.h" #include "tree_plugin.h"

0
kernel/rcutree.h → kernel/rcu/tree.h
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4
kernel/rcutree_plugin.h → kernel/rcu/tree_plugin.h
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@ -28,7 +28,7 @@
#include <linux/gfp.h> #include <linux/gfp.h>
#include <linux/oom.h> #include <linux/oom.h>
#include <linux/smpboot.h> #include <linux/smpboot.h>
#include "time/tick-internal.h" #include "../time/tick-internal.h"
#define RCU_KTHREAD_PRIO 1 #define RCU_KTHREAD_PRIO 1
@ -1133,7 +1133,7 @@ void exit_rcu(void)
#ifdef CONFIG_RCU_BOOST #ifdef CONFIG_RCU_BOOST
#include "rtmutex_common.h" #include "../rtmutex_common.h"
#ifdef CONFIG_RCU_TRACE #ifdef CONFIG_RCU_TRACE

2
kernel/rcutree_trace.c → kernel/rcu/tree_trace.c
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@ -44,7 +44,7 @@
#include <linux/seq_file.h> #include <linux/seq_file.h>
#define RCU_TREE_NONCORE #define RCU_TREE_NONCORE
#include "rcutree.h" #include "tree.h"
static int r_open(struct inode *inode, struct file *file, static int r_open(struct inode *inode, struct file *file,
const struct seq_operations *op) const struct seq_operations *op)

6
kernel/rcupdate.c → kernel/rcu/update.c
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@ -53,6 +53,12 @@
#include "rcu.h" #include "rcu.h"
MODULE_ALIAS("rcupdate");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "rcupdate."
module_param(rcu_expedited, int, 0); module_param(rcu_expedited, int, 0);
#ifdef CONFIG_PREEMPT_RCU #ifdef CONFIG_PREEMPT_RCU