Preempt-RCU: implementation
This patch implements a new version of RCU which allows its read-side
critical sections to be preempted. It uses a set of counter pairs
to keep track of the read-side critical sections and flips them
when all tasks exit read-side critical section. The details
of this implementation can be found in this paper -
http://www.rdrop.com/users/paulmck/RCU/OLSrtRCU.2006.08.11a.pdf
and the article-
http://lwn.net/Articles/253651/
This patch was developed as a part of the -rt kernel development and
meant to provide better latencies when read-side critical sections of
RCU don't disable preemption. As a consequence of keeping track of RCU
readers, the readers have a slight overhead (optimizations in the paper).
This implementation co-exists with the "classic" RCU implementations
and can be switched to at compiler.
Also includes RCU tracing summarized in debugfs.
[ akpm@linux-foundation.org: build fixes on non-preempt architectures ]
Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com>
Reviewed-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
new file mode 100644
index 0000000..a5aabb1
--- /dev/null
+++ b/kernel/rcupreempt.c
@@ -0,0 +1,816 @@
+/*
+ * Read-Copy Update mechanism for mutual exclusion, realtime implementation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2006
+ *
+ * Authors: Paul E. McKenney <paulmck@us.ibm.com>
+ * With thanks to Esben Nielsen, Bill Huey, and Ingo Molnar
+ * for pushing me away from locks and towards counters, and
+ * to Suparna Bhattacharya for pushing me completely away
+ * from atomic instructions on the read side.
+ *
+ * Papers: http://www.rdrop.com/users/paulmck/RCU
+ *
+ * Design Document: http://lwn.net/Articles/253651/
+ *
+ * For detailed explanation of Read-Copy Update mechanism see -
+ * Documentation/RCU/ *.txt
+ *
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/smp.h>
+#include <linux/rcupdate.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <asm/atomic.h>
+#include <linux/bitops.h>
+#include <linux/module.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>
+#include <linux/byteorder/swabb.h>
+#include <linux/cpumask.h>
+#include <linux/rcupreempt_trace.h>
+
+/*
+ * Macro that prevents the compiler from reordering accesses, but does
+ * absolutely -nothing- to prevent CPUs from reordering. This is used
+ * only to mediate communication between mainline code and hardware
+ * interrupt and NMI handlers.
+ */
+#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+
+/*
+ * PREEMPT_RCU data structures.
+ */
+
+/*
+ * GP_STAGES specifies the number of times the state machine has
+ * to go through the all the rcu_try_flip_states (see below)
+ * in a single Grace Period.
+ *
+ * GP in GP_STAGES stands for Grace Period ;)
+ */
+#define GP_STAGES 2
+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 **donetail;
+ long rcu_flipctr[2];
+#ifdef CONFIG_RCU_TRACE
+ struct rcupreempt_trace trace;
+#endif /* #ifdef CONFIG_RCU_TRACE */
+};
+
+/*
+ * States for rcu_try_flip() and friends.
+ */
+
+enum rcu_try_flip_states {
+
+ /*
+ * Stay here if nothing is happening. Flip the counter if somthing
+ * starts happening. Denoted by "I"
+ */
+ rcu_try_flip_idle_state,
+
+ /*
+ * Wait here for all CPUs to notice that the counter has flipped. This
+ * prevents the old set of counters from ever being incremented once
+ * we leave this state, which in turn is necessary because we cannot
+ * test any individual counter for zero -- we can only check the sum.
+ * Denoted by "A".
+ */
+ rcu_try_flip_waitack_state,
+
+ /*
+ * Wait here for the sum of the old per-CPU counters to reach zero.
+ * Denoted by "Z".
+ */
+ rcu_try_flip_waitzero_state,
+
+ /*
+ * Wait here for each of the other CPUs to execute a memory barrier.
+ * This is necessary to ensure that these other CPUs really have
+ * completed executing their RCU read-side critical sections, despite
+ * their CPUs wildly reordering memory. Denoted by "M".
+ */
+ rcu_try_flip_waitmb_state,
+};
+
+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 */
+};
+
+static DEFINE_PER_CPU(struct rcu_data, rcu_data);
+static struct rcu_ctrlblk rcu_ctrlblk = {
+ .fliplock = __SPIN_LOCK_UNLOCKED(rcu_ctrlblk.fliplock),
+ .completed = 0,
+ .rcu_try_flip_state = rcu_try_flip_idle_state,
+};
+
+
+#ifdef CONFIG_RCU_TRACE
+static char *rcu_try_flip_state_names[] =
+ { "idle", "waitack", "waitzero", "waitmb" };
+#endif /* #ifdef CONFIG_RCU_TRACE */
+
+/*
+ * Enum and per-CPU flag to determine when each CPU has seen
+ * the most recent counter flip.
+ */
+
+enum rcu_flip_flag_values {
+ rcu_flip_seen, /* Steady/initial state, last flip seen. */
+ /* Only GP detector can update. */
+ rcu_flipped /* Flip just completed, need confirmation. */
+ /* Only corresponding CPU can update. */
+};
+static DEFINE_PER_CPU_SHARED_ALIGNED(enum rcu_flip_flag_values, rcu_flip_flag)
+ = rcu_flip_seen;
+
+/*
+ * Enum and per-CPU flag to determine when each CPU has executed the
+ * needed memory barrier to fence in memory references from its last RCU
+ * read-side critical section in the just-completed grace period.
+ */
+
+enum rcu_mb_flag_values {
+ rcu_mb_done, /* Steady/initial state, no mb()s required. */
+ /* Only GP detector can update. */
+ rcu_mb_needed /* Flip just completed, need an mb(). */
+ /* Only corresponding CPU can update. */
+};
+static DEFINE_PER_CPU_SHARED_ALIGNED(enum rcu_mb_flag_values, rcu_mb_flag)
+ = rcu_mb_done;
+
+/*
+ * RCU_DATA_ME: find the current CPU's rcu_data structure.
+ * RCU_DATA_CPU: find the specified CPU's rcu_data structure.
+ */
+#define RCU_DATA_ME() (&__get_cpu_var(rcu_data))
+#define RCU_DATA_CPU(cpu) (&per_cpu(rcu_data, cpu))
+
+/*
+ * Helper macro for tracing when the appropriate rcu_data is not
+ * cached in a local variable, but where the CPU number is so cached.
+ */
+#define RCU_TRACE_CPU(f, cpu) RCU_TRACE(f, &(RCU_DATA_CPU(cpu)->trace));
+
+/*
+ * Helper macro for tracing when the appropriate rcu_data is not
+ * cached in a local variable.
+ */
+#define RCU_TRACE_ME(f) RCU_TRACE(f, &(RCU_DATA_ME()->trace));
+
+/*
+ * Helper macro for tracing when the appropriate rcu_data is pointed
+ * to by a local variable.
+ */
+#define RCU_TRACE_RDP(f, rdp) RCU_TRACE(f, &((rdp)->trace));
+
+/*
+ * Return the number of RCU batches processed thus far. Useful
+ * for debug and statistics.
+ */
+long rcu_batches_completed(void)
+{
+ return rcu_ctrlblk.completed;
+}
+EXPORT_SYMBOL_GPL(rcu_batches_completed);
+
+EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
+
+void __rcu_read_lock(void)
+{
+ int idx;
+ struct task_struct *t = current;
+ int nesting;
+
+ nesting = ACCESS_ONCE(t->rcu_read_lock_nesting);
+ if (nesting != 0) {
+
+ /* An earlier rcu_read_lock() covers us, just count it. */
+
+ t->rcu_read_lock_nesting = nesting + 1;
+
+ } else {
+ unsigned long flags;
+
+ /*
+ * We disable interrupts for the following reasons:
+ * - If we get scheduling clock interrupt here, and we
+ * end up acking the counter flip, it's like a promise
+ * that we will never increment the old counter again.
+ * Thus we will break that promise if that
+ * scheduling clock interrupt happens between the time
+ * we pick the .completed field and the time that we
+ * increment our counter.
+ *
+ * - We don't want to be preempted out here.
+ *
+ * NMIs can still occur, of course, and might themselves
+ * contain rcu_read_lock().
+ */
+
+ local_irq_save(flags);
+
+ /*
+ * Outermost nesting of rcu_read_lock(), so increment
+ * the current counter for the current CPU. Use volatile
+ * casts to prevent the compiler from reordering.
+ */
+
+ idx = ACCESS_ONCE(rcu_ctrlblk.completed) & 0x1;
+ ACCESS_ONCE(RCU_DATA_ME()->rcu_flipctr[idx])++;
+
+ /*
+ * Now that the per-CPU counter has been incremented, we
+ * are protected from races with rcu_read_lock() invoked
+ * from NMI handlers on this CPU. We can therefore safely
+ * increment the nesting counter, relieving further NMIs
+ * of the need to increment the per-CPU counter.
+ */
+
+ ACCESS_ONCE(t->rcu_read_lock_nesting) = nesting + 1;
+
+ /*
+ * Now that we have preventing any NMIs from storing
+ * to the ->rcu_flipctr_idx, we can safely use it to
+ * remember which counter to decrement in the matching
+ * rcu_read_unlock().
+ */
+
+ ACCESS_ONCE(t->rcu_flipctr_idx) = idx;
+ local_irq_restore(flags);
+ }
+}
+EXPORT_SYMBOL_GPL(__rcu_read_lock);
+
+void __rcu_read_unlock(void)
+{
+ int idx;
+ struct task_struct *t = current;
+ int nesting;
+
+ nesting = ACCESS_ONCE(t->rcu_read_lock_nesting);
+ if (nesting > 1) {
+
+ /*
+ * We are still protected by the enclosing rcu_read_lock(),
+ * so simply decrement the counter.
+ */
+
+ t->rcu_read_lock_nesting = nesting - 1;
+
+ } else {
+ unsigned long flags;
+
+ /*
+ * Disable local interrupts to prevent the grace-period
+ * detection state machine from seeing us half-done.
+ * NMIs can still occur, of course, and might themselves
+ * contain rcu_read_lock() and rcu_read_unlock().
+ */
+
+ local_irq_save(flags);
+
+ /*
+ * Outermost nesting of rcu_read_unlock(), so we must
+ * decrement the current counter for the current CPU.
+ * This must be done carefully, because NMIs can
+ * occur at any point in this code, and any rcu_read_lock()
+ * and rcu_read_unlock() pairs in the NMI handlers
+ * must interact non-destructively with this code.
+ * Lots of volatile casts, and -very- careful ordering.
+ *
+ * Changes to this code, including this one, must be
+ * inspected, validated, and tested extremely carefully!!!
+ */
+
+ /*
+ * First, pick up the index.
+ */
+
+ idx = ACCESS_ONCE(t->rcu_flipctr_idx);
+
+ /*
+ * Now that we have fetched the counter index, it is
+ * safe to decrement the per-task RCU nesting counter.
+ * After this, any interrupts or NMIs will increment and
+ * decrement the per-CPU counters.
+ */
+ ACCESS_ONCE(t->rcu_read_lock_nesting) = nesting - 1;
+
+ /*
+ * It is now safe to decrement this task's nesting count.
+ * NMIs that occur after this statement will route their
+ * rcu_read_lock() calls through this "else" clause, and
+ * will thus start incrementing the per-CPU counter on
+ * their own. They will also clobber ->rcu_flipctr_idx,
+ * but that is OK, since we have already fetched it.
+ */
+
+ ACCESS_ONCE(RCU_DATA_ME()->rcu_flipctr[idx])--;
+ local_irq_restore(flags);
+ }
+}
+EXPORT_SYMBOL_GPL(__rcu_read_unlock);
+
+/*
+ * If a global counter flip has occurred since the last time that we
+ * advanced callbacks, advance them. Hardware interrupts must be
+ * disabled when calling this function.
+ */
+static void __rcu_advance_callbacks(struct rcu_data *rdp)
+{
+ int cpu;
+ int i;
+ int wlc = 0;
+
+ if (rdp->completed != rcu_ctrlblk.completed) {
+ if (rdp->waitlist[GP_STAGES - 1] != NULL) {
+ *rdp->donetail = rdp->waitlist[GP_STAGES - 1];
+ rdp->donetail = rdp->waittail[GP_STAGES - 1];
+ RCU_TRACE_RDP(rcupreempt_trace_move2done, rdp);
+ }
+ for (i = GP_STAGES - 2; i >= 0; i--) {
+ if (rdp->waitlist[i] != NULL) {
+ rdp->waitlist[i + 1] = rdp->waitlist[i];
+ rdp->waittail[i + 1] = rdp->waittail[i];
+ wlc++;
+ } else {
+ rdp->waitlist[i + 1] = NULL;
+ rdp->waittail[i + 1] =
+ &rdp->waitlist[i + 1];
+ }
+ }
+ if (rdp->nextlist != NULL) {
+ rdp->waitlist[0] = rdp->nextlist;
+ rdp->waittail[0] = rdp->nexttail;
+ wlc++;
+ rdp->nextlist = NULL;
+ rdp->nexttail = &rdp->nextlist;
+ RCU_TRACE_RDP(rcupreempt_trace_move2wait, rdp);
+ } else {
+ rdp->waitlist[0] = NULL;
+ rdp->waittail[0] = &rdp->waitlist[0];
+ }
+ rdp->waitlistcount = wlc;
+ rdp->completed = rcu_ctrlblk.completed;
+ }
+
+ /*
+ * Check to see if this CPU needs to report that it has seen
+ * the most recent counter flip, thereby declaring that all
+ * subsequent rcu_read_lock() invocations will respect this flip.
+ */
+
+ cpu = raw_smp_processor_id();
+ if (per_cpu(rcu_flip_flag, cpu) == rcu_flipped) {
+ smp_mb(); /* Subsequent counter accesses must see new value */
+ per_cpu(rcu_flip_flag, cpu) = rcu_flip_seen;
+ smp_mb(); /* Subsequent RCU read-side critical sections */
+ /* seen -after- acknowledgement. */
+ }
+}
+
+/*
+ * Get here when RCU is idle. Decide whether we need to
+ * move out of idle state, and return non-zero if so.
+ * "Straightforward" approach for the moment, might later
+ * use callback-list lengths, grace-period duration, or
+ * some such to determine when to exit idle state.
+ * Might also need a pre-idle test that does not acquire
+ * the lock, but let's get the simple case working first...
+ */
+
+static int
+rcu_try_flip_idle(void)
+{
+ int cpu;
+
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_i1);
+ if (!rcu_pending(smp_processor_id())) {
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_ie1);
+ return 0;
+ }
+
+ /*
+ * Do the flip.
+ */
+
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_g1);
+ rcu_ctrlblk.completed++; /* stands in for rcu_try_flip_g2 */
+
+ /*
+ * Need a memory barrier so that other CPUs see the new
+ * counter value before they see the subsequent change of all
+ * the rcu_flip_flag instances to rcu_flipped.
+ */
+
+ smp_mb(); /* see above block comment. */
+
+ /* Now ask each CPU for acknowledgement of the flip. */
+
+ for_each_possible_cpu(cpu)
+ per_cpu(rcu_flip_flag, cpu) = rcu_flipped;
+
+ return 1;
+}
+
+/*
+ * Wait for CPUs to acknowledge the flip.
+ */
+
+static int
+rcu_try_flip_waitack(void)
+{
+ int cpu;
+
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_a1);
+ for_each_possible_cpu(cpu)
+ if (per_cpu(rcu_flip_flag, cpu) != rcu_flip_seen) {
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_ae1);
+ return 0;
+ }
+
+ /*
+ * Make sure our checks above don't bleed into subsequent
+ * waiting for the sum of the counters to reach zero.
+ */
+
+ smp_mb(); /* see above block comment. */
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_a2);
+ return 1;
+}
+
+/*
+ * Wait for collective ``last'' counter to reach zero,
+ * then tell all CPUs to do an end-of-grace-period memory barrier.
+ */
+
+static int
+rcu_try_flip_waitzero(void)
+{
+ int cpu;
+ int lastidx = !(rcu_ctrlblk.completed & 0x1);
+ int sum = 0;
+
+ /* Check to see if the sum of the "last" counters is zero. */
+
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_z1);
+ for_each_possible_cpu(cpu)
+ sum += RCU_DATA_CPU(cpu)->rcu_flipctr[lastidx];
+ if (sum != 0) {
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_ze1);
+ return 0;
+ }
+
+ /*
+ * This ensures that the other CPUs see the call for
+ * memory barriers -after- the sum to zero has been
+ * detected here
+ */
+ smp_mb(); /* ^^^^^^^^^^^^ */
+
+ /* Call for a memory barrier from each CPU. */
+ for_each_possible_cpu(cpu)
+ per_cpu(rcu_mb_flag, cpu) = rcu_mb_needed;
+
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_z2);
+ return 1;
+}
+
+/*
+ * Wait for all CPUs to do their end-of-grace-period memory barrier.
+ * Return 0 once all CPUs have done so.
+ */
+
+static int
+rcu_try_flip_waitmb(void)
+{
+ int cpu;
+
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_m1);
+ for_each_possible_cpu(cpu)
+ if (per_cpu(rcu_mb_flag, cpu) != rcu_mb_done) {
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_me1);
+ return 0;
+ }
+
+ smp_mb(); /* Ensure that the above checks precede any following flip. */
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_m2);
+ return 1;
+}
+
+/*
+ * Attempt a single flip of the counters. Remember, a single flip does
+ * -not- constitute a grace period. Instead, the interval between
+ * at least GP_STAGES consecutive flips is a grace period.
+ *
+ * If anyone is nuts enough to run this CONFIG_PREEMPT_RCU implementation
+ * on a large SMP, they might want to use a hierarchical organization of
+ * the per-CPU-counter pairs.
+ */
+static void rcu_try_flip(void)
+{
+ unsigned long flags;
+
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_1);
+ if (unlikely(!spin_trylock_irqsave(&rcu_ctrlblk.fliplock, flags))) {
+ RCU_TRACE_ME(rcupreempt_trace_try_flip_e1);
+ return;
+ }
+
+ /*
+ * Take the next transition(s) through the RCU grace-period
+ * flip-counter state machine.
+ */
+
+ switch (rcu_ctrlblk.rcu_try_flip_state) {
+ case rcu_try_flip_idle_state:
+ if (rcu_try_flip_idle())
+ rcu_ctrlblk.rcu_try_flip_state =
+ rcu_try_flip_waitack_state;
+ break;
+ case rcu_try_flip_waitack_state:
+ if (rcu_try_flip_waitack())
+ rcu_ctrlblk.rcu_try_flip_state =
+ rcu_try_flip_waitzero_state;
+ break;
+ case rcu_try_flip_waitzero_state:
+ if (rcu_try_flip_waitzero())
+ rcu_ctrlblk.rcu_try_flip_state =
+ rcu_try_flip_waitmb_state;
+ break;
+ case rcu_try_flip_waitmb_state:
+ if (rcu_try_flip_waitmb())
+ rcu_ctrlblk.rcu_try_flip_state =
+ rcu_try_flip_idle_state;
+ }
+ spin_unlock_irqrestore(&rcu_ctrlblk.fliplock, flags);
+}
+
+/*
+ * Check to see if this CPU needs to do a memory barrier in order to
+ * ensure that any prior RCU read-side critical sections have committed
+ * their counter manipulations and critical-section memory references
+ * before declaring the grace period to be completed.
+ */
+static void rcu_check_mb(int cpu)
+{
+ if (per_cpu(rcu_mb_flag, cpu) == rcu_mb_needed) {
+ smp_mb(); /* Ensure RCU read-side accesses are visible. */
+ per_cpu(rcu_mb_flag, cpu) = rcu_mb_done;
+ }
+}
+
+void rcu_check_callbacks(int cpu, int user)
+{
+ unsigned long flags;
+ struct rcu_data *rdp = RCU_DATA_CPU(cpu);
+
+ rcu_check_mb(cpu);
+ if (rcu_ctrlblk.completed == rdp->completed)
+ rcu_try_flip();
+ spin_lock_irqsave(&rdp->lock, flags);
+ RCU_TRACE_RDP(rcupreempt_trace_check_callbacks, rdp);
+ __rcu_advance_callbacks(rdp);
+ if (rdp->donelist == NULL) {
+ spin_unlock_irqrestore(&rdp->lock, flags);
+ } else {
+ spin_unlock_irqrestore(&rdp->lock, flags);
+ raise_softirq(RCU_SOFTIRQ);
+ }
+}
+
+/*
+ * Needed by dynticks, to make sure all RCU processing has finished
+ * when we go idle:
+ */
+void rcu_advance_callbacks(int cpu, int user)
+{
+ unsigned long flags;
+ struct rcu_data *rdp = RCU_DATA_CPU(cpu);
+
+ if (rcu_ctrlblk.completed == rdp->completed) {
+ rcu_try_flip();
+ if (rcu_ctrlblk.completed == rdp->completed)
+ return;
+ }
+ spin_lock_irqsave(&rdp->lock, flags);
+ RCU_TRACE_RDP(rcupreempt_trace_check_callbacks, rdp);
+ __rcu_advance_callbacks(rdp);
+ spin_unlock_irqrestore(&rdp->lock, flags);
+}
+
+static void rcu_process_callbacks(struct softirq_action *unused)
+{
+ unsigned long flags;
+ struct rcu_head *next, *list;
+ struct rcu_data *rdp = RCU_DATA_ME();
+
+ spin_lock_irqsave(&rdp->lock, flags);
+ list = rdp->donelist;
+ if (list == NULL) {
+ spin_unlock_irqrestore(&rdp->lock, flags);
+ return;
+ }
+ rdp->donelist = NULL;
+ rdp->donetail = &rdp->donelist;
+ RCU_TRACE_RDP(rcupreempt_trace_done_remove, rdp);
+ spin_unlock_irqrestore(&rdp->lock, flags);
+ while (list) {
+ next = list->next;
+ list->func(list);
+ list = next;
+ RCU_TRACE_ME(rcupreempt_trace_invoke);
+ }
+}
+
+void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
+{
+ unsigned long flags;
+ struct rcu_data *rdp;
+
+ head->func = func;
+ head->next = NULL;
+ local_irq_save(flags);
+ rdp = RCU_DATA_ME();
+ spin_lock(&rdp->lock);
+ __rcu_advance_callbacks(rdp);
+ *rdp->nexttail = head;
+ rdp->nexttail = &head->next;
+ RCU_TRACE_RDP(rcupreempt_trace_next_add, rdp);
+ spin_unlock(&rdp->lock);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL_GPL(call_rcu);
+
+/*
+ * 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);
+}
+EXPORT_SYMBOL_GPL(__synchronize_sched);
+
+/*
+ * 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
+ * 1 if so. Assumes that notifiers would take care of handling any
+ * outstanding requests from the RCU core.
+ *
+ * This function is part of the RCU implementation; it is -not-
+ * an exported member of the RCU API.
+ */
+int rcu_needs_cpu(int cpu)
+{
+ struct rcu_data *rdp = RCU_DATA_CPU(cpu);
+
+ return (rdp->donelist != NULL ||
+ !!rdp->waitlistcount ||
+ rdp->nextlist != NULL);
+}
+
+int rcu_pending(int cpu)
+{
+ struct rcu_data *rdp = RCU_DATA_CPU(cpu);
+
+ /* The CPU has at least one callback queued somewhere. */
+
+ if (rdp->donelist != NULL ||
+ !!rdp->waitlistcount ||
+ rdp->nextlist != NULL)
+ return 1;
+
+ /* The RCU core needs an acknowledgement from this CPU. */
+
+ if ((per_cpu(rcu_flip_flag, cpu) == rcu_flipped) ||
+ (per_cpu(rcu_mb_flag, cpu) == rcu_mb_needed))
+ return 1;
+
+ /* This CPU has fallen behind the global grace-period number. */
+
+ if (rdp->completed != rcu_ctrlblk.completed)
+ return 1;
+
+ /* Nothing needed from this CPU. */
+
+ return 0;
+}
+
+void __init __rcu_init(void)
+{
+ int cpu;
+ int i;
+ struct rcu_data *rdp;
+
+ printk(KERN_NOTICE "Preemptible RCU implementation.\n");
+ for_each_possible_cpu(cpu) {
+ rdp = RCU_DATA_CPU(cpu);
+ spin_lock_init(&rdp->lock);
+ rdp->completed = 0;
+ rdp->waitlistcount = 0;
+ rdp->nextlist = NULL;
+ rdp->nexttail = &rdp->nextlist;
+ for (i = 0; i < GP_STAGES; i++) {
+ rdp->waitlist[i] = NULL;
+ rdp->waittail[i] = &rdp->waitlist[i];
+ }
+ rdp->donelist = NULL;
+ rdp->donetail = &rdp->donelist;
+ rdp->rcu_flipctr[0] = 0;
+ rdp->rcu_flipctr[1] = 0;
+ }
+ open_softirq(RCU_SOFTIRQ, rcu_process_callbacks, NULL);
+}
+
+/*
+ * Deprecated, use synchronize_rcu() or synchronize_sched() instead.
+ */
+void synchronize_kernel(void)
+{
+ synchronize_rcu();
+}
+
+#ifdef CONFIG_RCU_TRACE
+long *rcupreempt_flipctr(int cpu)
+{
+ return &RCU_DATA_CPU(cpu)->rcu_flipctr[0];
+}
+EXPORT_SYMBOL_GPL(rcupreempt_flipctr);
+
+int rcupreempt_flip_flag(int cpu)
+{
+ return per_cpu(rcu_flip_flag, cpu);
+}
+EXPORT_SYMBOL_GPL(rcupreempt_flip_flag);
+
+int rcupreempt_mb_flag(int cpu)
+{
+ return per_cpu(rcu_mb_flag, cpu);
+}
+EXPORT_SYMBOL_GPL(rcupreempt_mb_flag);
+
+char *rcupreempt_try_flip_state_name(void)
+{
+ return rcu_try_flip_state_names[rcu_ctrlblk.rcu_try_flip_state];
+}
+EXPORT_SYMBOL_GPL(rcupreempt_try_flip_state_name);
+
+struct rcupreempt_trace *rcupreempt_trace_cpu(int cpu)
+{
+ struct rcu_data *rdp = RCU_DATA_CPU(cpu);
+
+ return &rdp->trace;
+}
+EXPORT_SYMBOL_GPL(rcupreempt_trace_cpu);
+
+#endif /* #ifdef RCU_TRACE */