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Merge branch 'linus' into cpus4096

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Conflicts:

	arch/x86/xen/smp.c
	kernel/sched_rt.c
	net/iucv/iucv.c

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2008-07-16 00:29:07 +02:00
parent 9982fbface 63cf13b77a
commit 82638844d9
2558 changed files with 166841 additions and 99878 deletions
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448
kernel/rcupreempt.c
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@@ -46,11 +46,11 @@
#include <asm/atomic.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/completion.h>
#include <linux/moduleparam.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/rcupdate.h>
#include <linux/cpu.h>
#include <linux/random.h>
#include <linux/delay.h>
@@ -82,14 +82,18 @@ struct rcu_data {
spinlock_t lock; /* Protect rcu_data fields. */
long completed; /* Number of last completed batch. */
int waitlistcount;
struct tasklet_struct rcu_tasklet;
struct rcu_head *nextlist;
struct rcu_head **nexttail;
struct rcu_head *waitlist[GP_STAGES];
struct rcu_head **waittail[GP_STAGES];
struct rcu_head *donelist;
struct rcu_head *donelist; /* from waitlist & waitschedlist */
struct rcu_head **donetail;
long rcu_flipctr[2];
struct rcu_head *nextschedlist;
struct rcu_head **nextschedtail;
struct rcu_head *waitschedlist;
struct rcu_head **waitschedtail;
int rcu_sched_sleeping;
#ifdef CONFIG_RCU_TRACE
struct rcupreempt_trace trace;
#endif /* #ifdef CONFIG_RCU_TRACE */
@@ -131,11 +135,24 @@ enum rcu_try_flip_states {
rcu_try_flip_waitmb_state,
};
/*
* States for rcu_ctrlblk.rcu_sched_sleep.
*/
enum rcu_sched_sleep_states {
rcu_sched_not_sleeping, /* Not sleeping, callbacks need GP. */
rcu_sched_sleep_prep, /* Thinking of sleeping, rechecking. */
rcu_sched_sleeping, /* Sleeping, awaken if GP needed. */
};
struct rcu_ctrlblk {
spinlock_t fliplock; /* Protect state-machine transitions. */
long completed; /* Number of last completed batch. */
enum rcu_try_flip_states rcu_try_flip_state; /* The current state of
the rcu state machine */
spinlock_t schedlock; /* Protect rcu_sched sleep state. */
enum rcu_sched_sleep_states sched_sleep; /* rcu_sched state. */
wait_queue_head_t sched_wq; /* Place for rcu_sched to sleep. */
};
static DEFINE_PER_CPU(struct rcu_data, rcu_data);
@@ -143,8 +160,12 @@ static struct rcu_ctrlblk rcu_ctrlblk = {
.fliplock = __SPIN_LOCK_UNLOCKED(rcu_ctrlblk.fliplock),
.completed = 0,
.rcu_try_flip_state = rcu_try_flip_idle_state,
.schedlock = __SPIN_LOCK_UNLOCKED(rcu_ctrlblk.schedlock),
.sched_sleep = rcu_sched_not_sleeping,
.sched_wq = __WAIT_QUEUE_HEAD_INITIALIZER(rcu_ctrlblk.sched_wq),
};
static struct task_struct *rcu_sched_grace_period_task;
#ifdef CONFIG_RCU_TRACE
static char *rcu_try_flip_state_names[] =
@@ -207,6 +228,8 @@ static DEFINE_PER_CPU_SHARED_ALIGNED(enum rcu_mb_flag_values, rcu_mb_flag)
*/
#define RCU_TRACE_RDP(f, rdp) RCU_TRACE(f, &((rdp)->trace));
#define RCU_SCHED_BATCH_TIME (HZ / 50)
/*
* Return the number of RCU batches processed thus far. Useful
* for debug and statistics.
@@ -411,32 +434,34 @@ static void __rcu_advance_callbacks(struct rcu_data *rdp)
}
}
#ifdef CONFIG_NO_HZ
DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_dyntick_sched, rcu_dyntick_sched) = {
.dynticks = 1,
};
DEFINE_PER_CPU(long, dynticks_progress_counter) = 1;
static DEFINE_PER_CPU(long, rcu_dyntick_snapshot);
#ifdef CONFIG_NO_HZ
static DEFINE_PER_CPU(int, rcu_update_flag);
/**
* rcu_irq_enter - Called from Hard irq handlers and NMI/SMI.
*
* If the CPU was idle with dynamic ticks active, this updates the
* dynticks_progress_counter to let the RCU handling know that the
* rcu_dyntick_sched.dynticks to let the RCU handling know that the
* CPU is active.
*/
void rcu_irq_enter(void)
{
int cpu = smp_processor_id();
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
if (per_cpu(rcu_update_flag, cpu))
per_cpu(rcu_update_flag, cpu)++;
/*
* Only update if we are coming from a stopped ticks mode
* (dynticks_progress_counter is even).
* (rcu_dyntick_sched.dynticks is even).
*/
if (!in_interrupt() &&
(per_cpu(dynticks_progress_counter, cpu) & 0x1) == 0) {
(rdssp->dynticks & 0x1) == 0) {
/*
* The following might seem like we could have a race
* with NMI/SMIs. But this really isn't a problem.
@@ -459,12 +484,12 @@ void rcu_irq_enter(void)
* RCU read-side critical sections on this CPU would
* have already completed.
*/
per_cpu(dynticks_progress_counter, cpu)++;
rdssp->dynticks++;
/*
* The following memory barrier ensures that any
* rcu_read_lock() primitives in the irq handler
* are seen by other CPUs to follow the above
* increment to dynticks_progress_counter. This is
* increment to rcu_dyntick_sched.dynticks. This is
* required in order for other CPUs to correctly
* determine when it is safe to advance the RCU
* grace-period state machine.
@@ -472,7 +497,7 @@ void rcu_irq_enter(void)
smp_mb(); /* see above block comment. */
/*
* Since we can't determine the dynamic tick mode from
* the dynticks_progress_counter after this routine,
* the rcu_dyntick_sched.dynticks after this routine,
* we use a second flag to acknowledge that we came
* from an idle state with ticks stopped.
*/
@@ -480,7 +505,7 @@ void rcu_irq_enter(void)
/*
* If we take an NMI/SMI now, they will also increment
* the rcu_update_flag, and will not update the
* dynticks_progress_counter on exit. That is for
* rcu_dyntick_sched.dynticks on exit. That is for
* this IRQ to do.
*/
}
@@ -490,12 +515,13 @@ void rcu_irq_enter(void)
* rcu_irq_exit - Called from exiting Hard irq context.
*
* If the CPU was idle with dynamic ticks active, update the
* dynticks_progress_counter to put let the RCU handling be
* rcu_dyntick_sched.dynticks to put let the RCU handling be
* aware that the CPU is going back to idle with no ticks.
*/
void rcu_irq_exit(void)
{
int cpu = smp_processor_id();
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
/*
* rcu_update_flag is set if we interrupted the CPU
@@ -503,7 +529,7 @@ void rcu_irq_exit(void)
* Once this occurs, we keep track of interrupt nesting
* because a NMI/SMI could also come in, and we still
* only want the IRQ that started the increment of the
* dynticks_progress_counter to be the one that modifies
* rcu_dyntick_sched.dynticks to be the one that modifies
* it on exit.
*/
if (per_cpu(rcu_update_flag, cpu)) {
@@ -515,28 +541,29 @@ void rcu_irq_exit(void)
/*
* If an NMI/SMI happens now we are still
* protected by the dynticks_progress_counter being odd.
* protected by the rcu_dyntick_sched.dynticks being odd.
*/
/*
* The following memory barrier ensures that any
* rcu_read_unlock() primitives in the irq handler
* are seen by other CPUs to preceed the following
* increment to dynticks_progress_counter. This
* increment to rcu_dyntick_sched.dynticks. This
* is required in order for other CPUs to determine
* when it is safe to advance the RCU grace-period
* state machine.
*/
smp_mb(); /* see above block comment. */
per_cpu(dynticks_progress_counter, cpu)++;
WARN_ON(per_cpu(dynticks_progress_counter, cpu) & 0x1);
rdssp->dynticks++;
WARN_ON(rdssp->dynticks & 0x1);
}
}
static void dyntick_save_progress_counter(int cpu)
{
per_cpu(rcu_dyntick_snapshot, cpu) =
per_cpu(dynticks_progress_counter, cpu);
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
rdssp->dynticks_snap = rdssp->dynticks;
}
static inline int
@@ -544,9 +571,10 @@ rcu_try_flip_waitack_needed(int cpu)
{
long curr;
long snap;
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
curr = per_cpu(dynticks_progress_counter, cpu);
snap = per_cpu(rcu_dyntick_snapshot, cpu);
curr = rdssp->dynticks;
snap = rdssp->dynticks_snap;
smp_mb(); /* force ordering with cpu entering/leaving dynticks. */
/*
@@ -567,7 +595,7 @@ rcu_try_flip_waitack_needed(int cpu)
* that this CPU already acknowledged the counter.
*/
if ((curr - snap) > 2 || (snap & 0x1) == 0)
if ((curr - snap) > 2 || (curr & 0x1) == 0)
return 0;
/* We need this CPU to explicitly acknowledge the counter flip. */
@@ -580,9 +608,10 @@ rcu_try_flip_waitmb_needed(int cpu)
{
long curr;
long snap;
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
curr = per_cpu(dynticks_progress_counter, cpu);
snap = per_cpu(rcu_dyntick_snapshot, cpu);
curr = rdssp->dynticks;
snap = rdssp->dynticks_snap;
smp_mb(); /* force ordering with cpu entering/leaving dynticks. */
/*
@@ -609,14 +638,86 @@ rcu_try_flip_waitmb_needed(int cpu)
return 1;
}
static void dyntick_save_progress_counter_sched(int cpu)
{
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
rdssp->sched_dynticks_snap = rdssp->dynticks;
}
static int rcu_qsctr_inc_needed_dyntick(int cpu)
{
long curr;
long snap;
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
curr = rdssp->dynticks;
snap = rdssp->sched_dynticks_snap;
smp_mb(); /* force ordering with cpu entering/leaving dynticks. */
/*
* If the CPU remained in dynticks mode for the entire time
* and didn't take any interrupts, NMIs, SMIs, or whatever,
* then it cannot be in the middle of an rcu_read_lock(), so
* the next rcu_read_lock() it executes must use the new value
* of the counter. Therefore, this CPU has been in a quiescent
* state the entire time, and we don't need to wait for it.
*/
if ((curr == snap) && ((curr & 0x1) == 0))
return 0;
/*
* If the CPU passed through or entered a dynticks idle phase with
* no active irq handlers, then, as above, this CPU has already
* passed through a quiescent state.
*/
if ((curr - snap) > 2 || (snap & 0x1) == 0)
return 0;
/* We need this CPU to go through a quiescent state. */
return 1;
}
#else /* !CONFIG_NO_HZ */
# define dyntick_save_progress_counter(cpu) do { } while (0)
# define rcu_try_flip_waitack_needed(cpu) (1)
# define rcu_try_flip_waitmb_needed(cpu) (1)
# define dyntick_save_progress_counter(cpu) do { } while (0)
# define rcu_try_flip_waitack_needed(cpu) (1)
# define rcu_try_flip_waitmb_needed(cpu) (1)
# define dyntick_save_progress_counter_sched(cpu) do { } while (0)
# define rcu_qsctr_inc_needed_dyntick(cpu) (1)
#endif /* CONFIG_NO_HZ */
static void save_qsctr_sched(int cpu)
{
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
rdssp->sched_qs_snap = rdssp->sched_qs;
}
static inline int rcu_qsctr_inc_needed(int cpu)
{
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
/*
* If there has been a quiescent state, no more need to wait
* on this CPU.
*/
if (rdssp->sched_qs != rdssp->sched_qs_snap) {
smp_mb(); /* force ordering with cpu entering schedule(). */
return 0;
}
/* We need this CPU to go through a quiescent state. */
return 1;
}
/*
* Get here when RCU is idle. Decide whether we need to
* move out of idle state, and return non-zero if so.
@@ -819,6 +920,26 @@ void rcu_check_callbacks(int cpu, int user)
unsigned long flags;
struct rcu_data *rdp = RCU_DATA_CPU(cpu);
/*
* If this CPU took its interrupt from user mode or from the
* idle loop, and this is not a nested interrupt, then
* this CPU has to have exited all prior preept-disable
* sections of code. So increment the counter to note this.
*
* The memory barrier is needed to handle the case where
* writes from a preempt-disable section of code get reordered
* into schedule() by this CPU's write buffer. So the memory
* barrier makes sure that the rcu_qsctr_inc() is seen by other
* CPUs to happen after any such write.
*/
if (user ||
(idle_cpu(cpu) && !in_softirq() &&
hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
smp_mb(); /* Guard against aggressive schedule(). */
rcu_qsctr_inc(cpu);
}
rcu_check_mb(cpu);
if (rcu_ctrlblk.completed == rdp->completed)
rcu_try_flip();
@@ -869,6 +990,8 @@ void rcu_offline_cpu(int cpu)
struct rcu_head *list = NULL;
unsigned long flags;
struct rcu_data *rdp = RCU_DATA_CPU(cpu);
struct rcu_head *schedlist = NULL;
struct rcu_head **schedtail = &schedlist;
struct rcu_head **tail = &list;
/*
@@ -882,6 +1005,11 @@ void rcu_offline_cpu(int cpu)
rcu_offline_cpu_enqueue(rdp->waitlist[i], rdp->waittail[i],
list, tail);
rcu_offline_cpu_enqueue(rdp->nextlist, rdp->nexttail, list, tail);
rcu_offline_cpu_enqueue(rdp->waitschedlist, rdp->waitschedtail,
schedlist, schedtail);
rcu_offline_cpu_enqueue(rdp->nextschedlist, rdp->nextschedtail,
schedlist, schedtail);
rdp->rcu_sched_sleeping = 0;
spin_unlock_irqrestore(&rdp->lock, flags);
rdp->waitlistcount = 0;
@@ -916,36 +1044,50 @@ void rcu_offline_cpu(int cpu)
* fix.
*/
local_irq_save(flags);
local_irq_save(flags); /* disable preempt till we know what lock. */
rdp = RCU_DATA_ME();
spin_lock(&rdp->lock);
*rdp->nexttail = list;
if (list)
rdp->nexttail = tail;
*rdp->nextschedtail = schedlist;
if (schedlist)
rdp->nextschedtail = schedtail;
spin_unlock_irqrestore(&rdp->lock, flags);
}
void __devinit rcu_online_cpu(int cpu)
{
unsigned long flags;
spin_lock_irqsave(&rcu_ctrlblk.fliplock, flags);
cpu_set(cpu, rcu_cpu_online_map);
spin_unlock_irqrestore(&rcu_ctrlblk.fliplock, flags);
}
#else /* #ifdef CONFIG_HOTPLUG_CPU */
void rcu_offline_cpu(int cpu)
{
}
void __devinit rcu_online_cpu(int cpu)
{
}
#endif /* #else #ifdef CONFIG_HOTPLUG_CPU */
void __cpuinit rcu_online_cpu(int cpu)
{
unsigned long flags;
struct rcu_data *rdp;
spin_lock_irqsave(&rcu_ctrlblk.fliplock, flags);
cpu_set(cpu, rcu_cpu_online_map);
spin_unlock_irqrestore(&rcu_ctrlblk.fliplock, flags);
/*
* The rcu_sched grace-period processing might have bypassed
* this CPU, given that it was not in the rcu_cpu_online_map
* when the grace-period scan started. This means that the
* grace-period task might sleep. So make sure that if this
* should happen, the first callback posted to this CPU will
* wake up the grace-period task if need be.
*/
rdp = RCU_DATA_CPU(cpu);
spin_lock_irqsave(&rdp->lock, flags);
rdp->rcu_sched_sleeping = 1;
spin_unlock_irqrestore(&rdp->lock, flags);
}
static void rcu_process_callbacks(struct softirq_action *unused)
{
unsigned long flags;
@@ -986,32 +1128,197 @@ void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
*rdp->nexttail = head;
rdp->nexttail = &head->next;
RCU_TRACE_RDP(rcupreempt_trace_next_add, rdp);
spin_unlock(&rdp->lock);
local_irq_restore(flags);
spin_unlock_irqrestore(&rdp->lock, flags);
}
EXPORT_SYMBOL_GPL(call_rcu);
void call_rcu_sched(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
{
unsigned long flags;
struct rcu_data *rdp;
int wake_gp = 0;
head->func = func;
head->next = NULL;
local_irq_save(flags);
rdp = RCU_DATA_ME();
spin_lock(&rdp->lock);
*rdp->nextschedtail = head;
rdp->nextschedtail = &head->next;
if (rdp->rcu_sched_sleeping) {
/* Grace-period processing might be sleeping... */
rdp->rcu_sched_sleeping = 0;
wake_gp = 1;
}
spin_unlock_irqrestore(&rdp->lock, flags);
if (wake_gp) {
/* Wake up grace-period processing, unless someone beat us. */
spin_lock_irqsave(&rcu_ctrlblk.schedlock, flags);
if (rcu_ctrlblk.sched_sleep != rcu_sched_sleeping)
wake_gp = 0;
rcu_ctrlblk.sched_sleep = rcu_sched_not_sleeping;
spin_unlock_irqrestore(&rcu_ctrlblk.schedlock, flags);
if (wake_gp)
wake_up_interruptible(&rcu_ctrlblk.sched_wq);
}
}
EXPORT_SYMBOL_GPL(call_rcu_sched);
/*
* Wait until all currently running preempt_disable() code segments
* (including hardware-irq-disable segments) complete. Note that
* in -rt this does -not- necessarily result in all currently executing
* interrupt -handlers- having completed.
*/
void __synchronize_sched(void)
{
cpumask_t oldmask;
int cpu;
if (sched_getaffinity(0, &oldmask) < 0)
oldmask = cpu_possible_map;
for_each_online_cpu(cpu) {
sched_setaffinity(0, &cpumask_of_cpu(cpu));
schedule();
}
sched_setaffinity(0, &oldmask);
}
synchronize_rcu_xxx(__synchronize_sched, call_rcu_sched)
EXPORT_SYMBOL_GPL(__synchronize_sched);
/*
* kthread function that manages call_rcu_sched grace periods.
*/
static int rcu_sched_grace_period(void *arg)
{
int couldsleep; /* might sleep after current pass. */
int couldsleepnext = 0; /* might sleep after next pass. */
int cpu;
unsigned long flags;
struct rcu_data *rdp;
int ret;
/*
* Each pass through the following loop handles one
* rcu_sched grace period cycle.
*/
do {
/* Save each CPU's current state. */
for_each_online_cpu(cpu) {
dyntick_save_progress_counter_sched(cpu);
save_qsctr_sched(cpu);
}
/*
* Sleep for about an RCU grace-period's worth to
* allow better batching and to consume less CPU.
*/
schedule_timeout_interruptible(RCU_SCHED_BATCH_TIME);
/*
* If there was nothing to do last time, prepare to
* sleep at the end of the current grace period cycle.
*/
couldsleep = couldsleepnext;
couldsleepnext = 1;
if (couldsleep) {
spin_lock_irqsave(&rcu_ctrlblk.schedlock, flags);
rcu_ctrlblk.sched_sleep = rcu_sched_sleep_prep;
spin_unlock_irqrestore(&rcu_ctrlblk.schedlock, flags);
}
/*
* Wait on each CPU in turn to have either visited
* a quiescent state or been in dynticks-idle mode.
*/
for_each_online_cpu(cpu) {
while (rcu_qsctr_inc_needed(cpu) &&
rcu_qsctr_inc_needed_dyntick(cpu)) {
/* resched_cpu(cpu); @@@ */
schedule_timeout_interruptible(1);
}
}
/* Advance callbacks for each CPU. */
for_each_online_cpu(cpu) {
rdp = RCU_DATA_CPU(cpu);
spin_lock_irqsave(&rdp->lock, flags);
/*
* We are running on this CPU irq-disabled, so no
* CPU can go offline until we re-enable irqs.
* The current CPU might have already gone
* offline (between the for_each_offline_cpu and
* the spin_lock_irqsave), but in that case all its
* callback lists will be empty, so no harm done.
*
* Advance the callbacks! We share normal RCU's
* donelist, since callbacks are invoked the
* same way in either case.
*/
if (rdp->waitschedlist != NULL) {
*rdp->donetail = rdp->waitschedlist;
rdp->donetail = rdp->waitschedtail;
/*
* Next rcu_check_callbacks() will
* do the required raise_softirq().
*/
}
if (rdp->nextschedlist != NULL) {
rdp->waitschedlist = rdp->nextschedlist;
rdp->waitschedtail = rdp->nextschedtail;
couldsleep = 0;
couldsleepnext = 0;
} else {
rdp->waitschedlist = NULL;
rdp->waitschedtail = &rdp->waitschedlist;
}
rdp->nextschedlist = NULL;
rdp->nextschedtail = &rdp->nextschedlist;
/* Mark sleep intention. */
rdp->rcu_sched_sleeping = couldsleep;
spin_unlock_irqrestore(&rdp->lock, flags);
}
/* If we saw callbacks on the last scan, go deal with them. */
if (!couldsleep)
continue;
/* Attempt to block... */
spin_lock_irqsave(&rcu_ctrlblk.schedlock, flags);
if (rcu_ctrlblk.sched_sleep != rcu_sched_sleep_prep) {
/*
* Someone posted a callback after we scanned.
* Go take care of it.
*/
spin_unlock_irqrestore(&rcu_ctrlblk.schedlock, flags);
couldsleepnext = 0;
continue;
}
/* Block until the next person posts a callback. */
rcu_ctrlblk.sched_sleep = rcu_sched_sleeping;
spin_unlock_irqrestore(&rcu_ctrlblk.schedlock, flags);
ret = 0;
__wait_event_interruptible(rcu_ctrlblk.sched_wq,
rcu_ctrlblk.sched_sleep != rcu_sched_sleeping,
ret);
/*
* Signals would prevent us from sleeping, and we cannot
* do much with them in any case. So flush them.
*/
if (ret)
flush_signals(current);
couldsleepnext = 0;
} while (!kthread_should_stop());
return (0);
}
/*
* Check to see if any future RCU-related work will need to be done
* by the current CPU, even if none need be done immediately, returning
@@ -1027,7 +1334,9 @@ int rcu_needs_cpu(int cpu)
return (rdp->donelist != NULL ||
!!rdp->waitlistcount ||
rdp->nextlist != NULL);
rdp->nextlist != NULL ||
rdp->nextschedlist != NULL ||
rdp->waitschedlist != NULL);
}
int rcu_pending(int cpu)
@@ -1038,7 +1347,9 @@ int rcu_pending(int cpu)
if (rdp->donelist != NULL ||
!!rdp->waitlistcount ||
rdp->nextlist != NULL)
rdp->nextlist != NULL ||
rdp->nextschedlist != NULL ||
rdp->waitschedlist != NULL)
return 1;
/* The RCU core needs an acknowledgement from this CPU. */
@@ -1105,6 +1416,11 @@ void __init __rcu_init(void)
rdp->donetail = &rdp->donelist;
rdp->rcu_flipctr[0] = 0;
rdp->rcu_flipctr[1] = 0;
rdp->nextschedlist = NULL;
rdp->nextschedtail = &rdp->nextschedlist;
rdp->waitschedlist = NULL;
rdp->waitschedtail = &rdp->waitschedlist;
rdp->rcu_sched_sleeping = 0;
}
register_cpu_notifier(&rcu_nb);
@@ -1123,15 +1439,19 @@ void __init __rcu_init(void)
for_each_online_cpu(cpu)
rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE, (void *)(long) cpu);
open_softirq(RCU_SOFTIRQ, rcu_process_callbacks, NULL);
open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
}
/*
* Deprecated, use synchronize_rcu() or synchronize_sched() instead.
* Late-boot-time RCU initialization that must wait until after scheduler
* has been initialized.
*/
void synchronize_kernel(void)
void __init rcu_init_sched(void)
{
synchronize_rcu();
rcu_sched_grace_period_task = kthread_run(rcu_sched_grace_period,
NULL,
"rcu_sched_grace_period");
WARN_ON(IS_ERR(rcu_sched_grace_period_task));
}
#ifdef CONFIG_RCU_TRACE