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authorDavid Woodhouse <David.Woodhouse@intel.com>2009-01-05 11:31:03 -0500
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-01-05 11:31:03 -0500
commit647b0d3854d776485faea9de7e7ed7fd4bdc6f20 (patch)
tree9a527f270afdf6157699d8c360b63a53c0419146 /scripts/unifdef.c
parent572acc41274522b865440d0644d5f986e3c83755 (diff)
[MTD] [TESTS] Fix some size_t printk format warnings
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'scripts/unifdef.c')
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/*
 * Read-Copy Update mechanism for mutual exclusion
 *
 * 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, you can access it online at
 * http://www.gnu.org/licenses/gpl-2.0.html.
 *
 * Copyright IBM Corporation, 2008
 *
 * Authors: Dipankar Sarma <dipankar@in.ibm.com>
 *	    Manfred Spraul <manfred@colorfullife.com>
 *	    Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical version
 *
 * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
 *
 * For detailed explanation of Read-Copy Update mechanism see -
 *	Documentation/RCU
 */

#define pr_fmt(fmt) "rcu: " fmt

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/rcupdate_wait.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/nmi.h>
#include <linux/atomic.h>
#include <linux/bitops.h>
#include <linux/export.h>
#include <linux/completion.h>
#include <linux/moduleparam.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/mutex.h>
#include <linux/time.h>
#include <linux/kernel_stat.h>
#include <linux/wait.h>
#include <linux/kthread.h>
#include <uapi/linux/sched/types.h>
#include <linux/prefetch.h>
#include <linux/delay.h>
#include <linux/stop_machine.h>
#include <linux/random.h>
#include <linux/trace_events.h>
#include <linux/suspend.h>
#include <linux/ftrace.h>

#include "tree.h"
#include "rcu.h"

#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "rcutree."

/* Data structures. */

/*
 * In order to export the rcu_state name to the tracing tools, it
 * needs to be added in the __tracepoint_string section.
 * This requires defining a separate variable tp_<sname>_varname
 * that points to the string being used, and this will allow
 * the tracing userspace tools to be able to decipher the string
 * address to the matching string.
 */
#ifdef CONFIG_TRACING
# define DEFINE_RCU_TPS(sname) \
static char sname##_varname[] = #sname; \
static const char *tp_##sname##_varname __used __tracepoint_string = sname##_varname;
# define RCU_STATE_NAME(sname) sname##_varname
#else
# define DEFINE_RCU_TPS(sname)
# define RCU_STATE_NAME(sname) __stringify(sname)
#endif

#define RCU_STATE_INITIALIZER(sname, sabbr, cr) \
DEFINE_RCU_TPS(sname) \
static DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_data, sname##_data); \
struct rcu_state sname##_state = { \
	.level = { &sname##_state.node[0] }, \
	.rda = &sname##_data, \
	.call = cr, \
	.gp_state = RCU_GP_IDLE, \
	.gp_seq = (0UL - 300UL) << RCU_SEQ_CTR_SHIFT, \
	.barrier_mutex = __MUTEX_INITIALIZER(sname##_state.barrier_mutex), \
	.name = RCU_STATE_NAME(sname), \
	.abbr = sabbr, \
	.exp_mutex = __MUTEX_INITIALIZER(sname##_state.exp_mutex), \
	.exp_wake_mutex = __MUTEX_INITIALIZER(sname##_state.exp_wake_mutex), \
	.ofl_lock = __SPIN_LOCK_UNLOCKED(sname##_state.ofl_lock), \
}

RCU_STATE_INITIALIZER(rcu_sched, 's', call_rcu_sched);
RCU_STATE_INITIALIZER(rcu_bh, 'b', call_rcu_bh);

static struct rcu_state *const rcu_state_p;
LIST_HEAD(rcu_struct_flavors);

/* Dump rcu_node combining tree at boot to verify correct setup. */
static bool dump_tree;
module_param(dump_tree, bool, 0444);
/* Control rcu_node-tree auto-balancing at boot time. */
static bool rcu_fanout_exact;
module_param(rcu_fanout_exact, bool, 0444);
/* Increase (but not decrease) the RCU_FANOUT_LEAF at boot time. */
static int rcu_fanout_leaf = RCU_FANOUT_LEAF;
module_param(rcu_fanout_leaf, int, 0444);
int rcu_num_lvls __read_mostly = RCU_NUM_LVLS;
/* Number of rcu_nodes at specified level. */
int num_rcu_lvl[] = NUM_RCU_LVL_INIT;
int rcu_num_nodes __read_mostly = NUM_RCU_NODES; /* Total # rcu_nodes in use. */
/* panic() on RCU Stall sysctl. */
int sysctl_panic_on_rcu_stall __read_mostly;

/*
 * The rcu_scheduler_active variable is initialized to the value
 * RCU_SCHEDULER_INACTIVE and transitions RCU_SCHEDULER_INIT just before the
 * first task is spawned.  So when this variable is RCU_SCHEDULER_INACTIVE,
 * RCU can assume that there is but one task, allowing RCU to (for example)
 * optimize synchronize_rcu() to a simple barrier().  When this variable
 * is RCU_SCHEDULER_INIT, RCU must actually do all the hard work required
 * to detect real grace periods.  This variable is also used to suppress
 * boot-time false positives from lockdep-RCU error checking.  Finally, it
 * transitions from RCU_SCHEDULER_INIT to RCU_SCHEDULER_RUNNING after RCU
 * is fully initialized, including all of its kthreads having been spawned.
 */
int rcu_scheduler_active __read_mostly;
EXPORT_SYMBOL_GPL(rcu_scheduler_active);

/*
 * The rcu_scheduler_fully_active variable transitions from zero to one
 * during the early_initcall() processing, which is after the scheduler
 * is capable of creating new tasks.  So RCU processing (for example,
 * creating tasks for RCU priority boosting) must be delayed until after
 * rcu_scheduler_fully_active transitions from zero to one.  We also
 * currently delay invocation of any RCU callbacks until after this point.
 *
 * It might later prove better for people registering RCU callbacks during
 * early boot to take responsibility for these callbacks, but one step at
 * a time.
 */
static int rcu_scheduler_fully_active __read_mostly;

static void
rcu_report_qs_rnp(unsigned long mask, struct rcu_state *rsp,
		  struct rcu_node *rnp, unsigned long gps, unsigned long flags);
static void rcu_init_new_rnp(struct rcu_node *rnp_leaf);
static void rcu_cleanup_dead_rnp(struct rcu_node *rnp_leaf);
static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu);
static void invoke_rcu_core(void);
static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp);
static void rcu_report_exp_rdp(struct rcu_state *rsp,
			       struct rcu_data *rdp, bool wake);
static void sync_sched_exp_online_cleanup(int cpu);

/* rcuc/rcub kthread realtime priority */
static int kthread_prio = IS_ENABLED(CONFIG_RCU_BOOST) ? 1 : 0;
module_param(kthread_prio, int, 0644);

/* Delay in jiffies for grace-period initialization delays, debug only. */

static int gp_preinit_delay;
module_param(gp_preinit_delay, int, 0444);
static int gp_init_delay;
module_param(gp_init_delay, int, 0444);
static int gp_cleanup_delay;
module_param(gp_cleanup_delay, int, 0444);

/* Retreive RCU kthreads priority for rcutorture */
int rcu_get_gp_kthreads_prio(void)
{
	return kthread_prio;
}
EXPORT_SYMBOL_GPL(rcu_get_gp_kthreads_prio);

/*
 * Number of grace periods between delays, normalized by the duration of
 * the delay.  The longer the delay, the more the grace periods between
 * each delay.  The reason for this normalization is that it means that,
 * for non-zero delays, the overall slowdown of grace periods is constant
 * regardless of the duration of the delay.  This arrangement balances
 * the need for long delays to increase some race probabilities with the
 * need for fast grace periods to increase other race probabilities.
 */
#define PER_RCU_NODE_PERIOD 3	/* Number of grace periods between delays. */

/*
 * Compute the mask of online CPUs for the specified rcu_node structure.
 * This will not be stable unless the rcu_node structure's ->lock is
 * held, but the bit corresponding to the current CPU will be stable
 * in most contexts.
 */
unsigned long rcu_rnp_online_cpus(struct rcu_node *rnp)
{
	return READ_ONCE(rnp->qsmaskinitnext);
}

/*
 * Return true if an RCU grace period is in progress.  The READ_ONCE()s
 * permit this function to be invoked without holding the root rcu_node
 * structure's ->lock, but of course results can be subject to change.
 */
static int rcu_gp_in_progress(struct rcu_state *rsp)
{
	return rcu_seq_state(rcu_seq_current(&rsp->gp_seq));
}

/*
 * Note a quiescent state.  Because we do not need to know
 * how many quiescent states passed, just if there was at least
 * one since the start of the grace period, this just sets a flag.
 * The caller must have disabled preemption.
 */
void rcu_sched_qs(void)
{
	RCU_LOCKDEP_WARN(preemptible(), "rcu_sched_qs() invoked with preemption enabled!!!");
	if (!__this_cpu_read(rcu_sched_data.cpu_no_qs.s))
		return;
	trace_rcu_grace_period(TPS("rcu_sched"),
			       __this_cpu_read(rcu_sched_data.gp_seq),
			       TPS("cpuqs"));
	__this_cpu_write(rcu_sched_data.cpu_no_qs.b.norm, false);
	if (!__this_cpu_read(rcu_sched_data.cpu_no_qs.b.exp))
		return;
	__this_cpu_write(rcu_sched_data.cpu_no_qs.b.exp, false);
	rcu_report_exp_rdp(&rcu_sched_state,
			   this_cpu_ptr(&rcu_sched_data), true);
}

void rcu_bh_qs(void)
{
	RCU_LOCKDEP_WARN(preemptible(), "rcu_bh_qs() invoked with preemption enabled!!!");
	if (__this_cpu_read(rcu_bh_data.cpu_no_qs.s)) {
		trace_rcu_grace_period(TPS("rcu_bh"),
				       __this_cpu_read(rcu_bh_data.gp_seq),
				       TPS("cpuqs"));
		__this_cpu_write(rcu_bh_data.cpu_no_qs.b.norm, false);
	}
}

/*
 * Steal a bit from the bottom of ->dynticks for idle entry/exit
 * control.  Initially this is for TLB flushing.
 */
#define RCU_DYNTICK_CTRL_MASK 0x1
#define RCU_DYNTICK_CTRL_CTR  (RCU_DYNTICK_CTRL_MASK + 1)
#ifndef rcu_eqs_special_exit
#define rcu_eqs_special_exit() do { } while (0)
#endif

static DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = {
	.dynticks_nesting = 1,
	.dynticks_nmi_nesting = DYNTICK_IRQ_NONIDLE,
	.dynticks = ATOMIC_INIT(RCU_DYNTICK_CTRL_CTR),
};

/*
 * Record entry into an extended quiescent state.  This is only to be
 * called when not already in an extended quiescent state.
 */
static void rcu_dynticks_eqs_enter(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
	int seq;

	/*
	 * CPUs seeing atomic_add_return() must see prior RCU read-side
	 * critical sections, and we also must force ordering with the
	 * next idle sojourn.
	 */
	seq = atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdtp->dynticks);
	/* Better be in an extended quiescent state! */
	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
		     (seq & RCU_DYNTICK_CTRL_CTR));
	/* Better not have special action (TLB flush) pending! */
	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
		     (seq & RCU_DYNTICK_CTRL_MASK));
}

/*
 * Record exit from an extended quiescent state.  This is only to be
 * called from an extended quiescent state.
 */
static void rcu_dynticks_eqs_exit(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
	int seq;

	/*
	 * CPUs seeing atomic_add_return() must see prior idle sojourns,
	 * and we also must force ordering with the next RCU read-side
	 * critical section.
	 */
	seq = atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdtp->dynticks);
	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
		     !(seq & RCU_DYNTICK_CTRL_CTR));
	if (seq & RCU_DYNTICK_CTRL_MASK) {
		atomic_andnot(RCU_DYNTICK_CTRL_MASK, &rdtp->dynticks);
		smp_mb__after_atomic(); /* _exit after clearing mask. */
		/* Prefer duplicate flushes to losing a flush. */
		rcu_eqs_special_exit();
	}
}

/*
 * Reset the current CPU's ->dynticks counter to indicate that the
 * newly onlined CPU is no longer in an extended quiescent state.
 * This will either leave the counter unchanged, or increment it
 * to the next non-quiescent value.
 *
 * The non-atomic test/increment sequence works because the upper bits
 * of the ->dynticks counter are manipulated only by the corresponding CPU,
 * or when the corresponding CPU is offline.
 */
static void rcu_dynticks_eqs_online(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);

	if (atomic_read(&rdtp->dynticks) & RCU_DYNTICK_CTRL_CTR)
		return;
	atomic_add(RCU_DYNTICK_CTRL_CTR, &rdtp->dynticks);
}

/*
 * Is the current CPU in an extended quiescent state?
 *
 * No ordering, as we are sampling CPU-local information.
 */
bool rcu_dynticks_curr_cpu_in_eqs(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);

	return !(atomic_read(&rdtp->dynticks) & RCU_DYNTICK_CTRL_CTR);
}

/*
 * Snapshot the ->dynticks counter with full ordering so as to allow
 * stable comparison of this counter with past and future snapshots.
 */
int rcu_dynticks_snap(struct rcu_dynticks *rdtp)
{
	int snap = atomic_add_return(0, &rdtp->dynticks);

	return snap & ~RCU_DYNTICK_CTRL_MASK;
}

/*
 * Return true if the snapshot returned from rcu_dynticks_snap()
 * indicates that RCU is in an extended quiescent state.
 */
static bool rcu_dynticks_in_eqs(int snap)
{
	return !(snap & RCU_DYNTICK_CTRL_CTR);
}

/*
 * Return true if the CPU corresponding to the specified rcu_dynticks
 * structure has spent some time in an extended quiescent state since
 * rcu_dynticks_snap() returned the specified snapshot.
 */
static bool rcu_dynticks_in_eqs_since(struct rcu_dynticks *rdtp, int snap)
{
	return snap != rcu_dynticks_snap(rdtp);
}

/*
 * Set the special (bottom) bit of the specified CPU so that it
 * will take special action (such as flushing its TLB) on the
 * next exit from an extended quiescent state.  Returns true if
 * the bit was successfully set, or false if the CPU was not in
 * an extended quiescent state.
 */
bool rcu_eqs_special_set(int cpu)
{
	int old;
	int new;
	struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu);

	do {
		old = atomic_read(&rdtp->dynticks);
		if (old & RCU_DYNTICK_CTRL_CTR)
			return false;
		new = old | RCU_DYNTICK_CTRL_MASK;
	} while (atomic_cmpxchg(&rdtp->dynticks, old, new) != old);
	return true;
}

/*
 * Let the RCU core know that this CPU has gone through the scheduler,
 * which is a quiescent state.  This is called when the need for a
 * quiescent state is urgent, so we burn an atomic operation and full
 * memory barriers to let the RCU core know about it, regardless of what
 * this CPU might (or might not) do in the near future.
 *
 * We inform the RCU core by emulating a zero-duration dyntick-idle period.
 *
 * The caller must have disabled interrupts and must not be idle.
 */
static void rcu_momentary_dyntick_idle(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
	int special;

	raw_cpu_write(rcu_dynticks.rcu_need_heavy_qs, false);
	special = atomic_add_return(2 * RCU_DYNTICK_CTRL_CTR, &rdtp->dynticks);
	/* It is illegal to call this from idle state. */
	WARN_ON_ONCE(!(special & RCU_DYNTICK_CTRL_CTR));
}

/*
 * Note a context switch.  This is a quiescent state for RCU-sched,
 * and requires special handling for preemptible RCU.
 * The caller must have disabled interrupts.
 */
void rcu_note_context_switch(bool preempt)
{
	barrier(); /* Avoid RCU read-side critical sections leaking down. */
	trace_rcu_utilization(TPS("Start context switch"));
	rcu_sched_qs();
	rcu_preempt_note_context_switch(preempt);
	/* Load rcu_urgent_qs before other flags. */
	if (!smp_load_acquire(this_cpu_ptr(&rcu_dynticks.rcu_urgent_qs)))
		goto out;
	this_cpu_write(rcu_dynticks.rcu_urgent_qs, false);
	if (unlikely(raw_cpu_read(rcu_dynticks.rcu_need_heavy_qs)))
		rcu_momentary_dyntick_idle();
	this_cpu_inc(rcu_dynticks.rcu_qs_ctr);
	if (!preempt)
		rcu_tasks_qs(current);
out:
	trace_rcu_utilization(TPS("End context switch"));
	barrier(); /* Avoid RCU read-side critical sections leaking up. */
}
EXPORT_SYMBOL_GPL(rcu_note_context_switch);

/*
 * Register a quiescent state for all RCU flavors.  If there is an
 * emergency, invoke rcu_momentary_dyntick_idle() to do a heavy-weight
 * dyntick-idle quiescent state visible to other CPUs (but only for those
 * RCU flavors in desperate need of a quiescent state, which will normally
 * be none of them).  Either way, do a lightweight quiescent state for
 * all RCU flavors.
 *
 * The barrier() calls are redundant in the common case when this is
 * called externally, but just in case this is called from within this
 * file.
 *
 */
void rcu_all_qs(void)
{
	unsigned long flags;

	if (!raw_cpu_read(rcu_dynticks.rcu_urgent_qs))
		return;
	preempt_disable();
	/* Load rcu_urgent_qs before other flags. */
	if (!smp_load_acquire(this_cpu_ptr(&rcu_dynticks.rcu_urgent_qs))) {
		preempt_enable();
		return;
	}
	this_cpu_write(rcu_dynticks.rcu_urgent_qs, false);
	barrier(); /* Avoid RCU read-side critical sections leaking down. */
	if (unlikely(raw_cpu_read(rcu_dynticks.rcu_need_heavy_qs))) {
		local_irq_save(flags);
		rcu_momentary_dyntick_idle();
		local_irq_restore(flags);
	}
	if (unlikely(raw_cpu_read(rcu_sched_data.cpu_no_qs.b.exp)))
		rcu_sched_qs();
	this_cpu_inc(rcu_dynticks.rcu_qs_ctr);
	barrier(); /* Avoid RCU read-side critical sections leaking up. */
	preempt_enable();
}
EXPORT_SYMBOL_GPL(rcu_all_qs);

#define DEFAULT_RCU_BLIMIT 10     /* Maximum callbacks per rcu_do_batch. */
static long blimit = DEFAULT_RCU_BLIMIT;
#define DEFAULT_RCU_QHIMARK 10000 /* If this many pending, ignore blimit. */
static long qhimark = DEFAULT_RCU_QHIMARK;
#define DEFAULT_RCU_QLOMARK 100   /* Once only this many pending, use blimit. */
static long qlowmark = DEFAULT_RCU_QLOMARK;

module_param(blimit, long, 0444);
module_param(qhimark, long, 0444);
module_param(qlowmark, long, 0444);

static ulong jiffies_till_first_fqs = ULONG_MAX;
static ulong jiffies_till_next_fqs = ULONG_MAX;
static bool rcu_kick_kthreads;

static int param_set_first_fqs_jiffies(const char *val, const struct kernel_param *kp)
{
	ulong j;
	int ret = kstrtoul(val, 0, &j);

	if (!ret)
		WRITE_ONCE(*(ulong *)kp->arg, (j > HZ) ? HZ : j);
	return ret;
}

static int param_set_next_fqs_jiffies(const char *val, const struct kernel_param *kp)
{
	ulong j;
	int ret = kstrtoul(val, 0, &j);

	if (!ret)
		WRITE_ONCE(*(ulong *)kp->arg, (j > HZ) ? HZ : (j ?: 1));
	return ret;
}

static struct kernel_param_ops first_fqs_jiffies_ops = {
	.set = param_set_first_fqs_jiffies,
	.get = param_get_ulong,
};

static struct kernel_param_ops next_fqs_jiffies_ops = {
	.set = param_set_next_fqs_jiffies,
	.get = param_get_ulong,
};

module_param_cb(jiffies_till_first_fqs, &first_fqs_jiffies_ops, &jiffies_till_first_fqs, 0644);
module_param_cb(jiffies_till_next_fqs, &next_fqs_jiffies_ops, &jiffies_till_next_fqs, 0644);
module_param(rcu_kick_kthreads, bool, 0644);

/*
 * How long the grace period must be before we start recruiting
 * quiescent-state help from rcu_note_context_switch().
 */
static ulong jiffies_till_sched_qs = HZ / 10;
module_param(jiffies_till_sched_qs, ulong, 0444);

static void force_qs_rnp(struct rcu_state *rsp, int (*f)(struct rcu_data *rsp));
static void force_quiescent_state(struct rcu_state *rsp);
static int rcu_pending(void);

/*
 * Return the number of RCU GPs completed thus far for debug & stats.
 */
unsigned long rcu_get_gp_seq(void)
{
	return READ_ONCE(rcu_state_p->gp_seq);
}
EXPORT_SYMBOL_GPL(rcu_get_gp_seq);

/*
 * Return the number of RCU-sched GPs completed thus far for debug & stats.
 */
unsigned long rcu_sched_get_gp_seq(void)
{
	return READ_ONCE(rcu_sched_state.gp_seq);
}
EXPORT_SYMBOL_GPL(rcu_sched_get_gp_seq);

/*
 * Return the number of RCU-bh GPs completed thus far for debug & stats.
 */
unsigned long rcu_bh_get_gp_seq(void)
{
	return READ_ONCE(rcu_bh_state.gp_seq);
}
EXPORT_SYMBOL_GPL(rcu_bh_get_gp_seq);

/*
 * Return the number of RCU expedited batches completed thus far for
 * debug & stats.  Odd numbers mean that a batch is in progress, even
 * numbers mean idle.  The value returned will thus be roughly double
 * the cumulative batches since boot.
 */
unsigned long rcu_exp_batches_completed(void)
{
	return rcu_state_p->expedited_sequence;
}
EXPORT_SYMBOL_GPL(rcu_exp_batches_completed);

/*
 * Return the number of RCU-sched expedited batches completed thus far
 * for debug & stats.  Similar to rcu_exp_batches_completed().
 */
unsigned long rcu_exp_batches_completed_sched(void)
{
	return rcu_sched_state.expedited_sequence;
}
EXPORT_SYMBOL_GPL(rcu_exp_batches_completed_sched);

/*
 * Force a quiescent state.
 */
void rcu_force_quiescent_state(void)
{
	force_quiescent_state(rcu_state_p);
}
EXPORT_SYMBOL_GPL(rcu_force_quiescent_state);

/*
 * Force a quiescent state for RCU BH.
 */
void rcu_bh_force_quiescent_state(void)
{
	force_quiescent_state(&rcu_bh_state);
}
EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state);

/*
 * Force a quiescent state for RCU-sched.
 */
void rcu_sched_force_quiescent_state(void)
{
	force_quiescent_state(&rcu_sched_state);
}
EXPORT_SYMBOL_GPL(rcu_sched_force_quiescent_state);

/*
 * Show the state of the grace-period kthreads.
 */
void show_rcu_gp_kthreads(void)
{
	int cpu;
	struct rcu_data *rdp;
	struct rcu_node *rnp;
	struct rcu_state *rsp;

	for_each_rcu_flavor(rsp) {
		pr_info("%s: wait state: %d ->state: %#lx\n",
			rsp->name, rsp->gp_state, rsp->gp_kthread->state);
		rcu_for_each_node_breadth_first(rsp, rnp) {
			if (ULONG_CMP_GE(rsp->gp_seq, rnp->gp_seq_needed))
				continue;
			pr_info("\trcu_node %d:%d ->gp_seq %lu ->gp_seq_needed %lu\n",
				rnp->grplo, rnp->grphi, rnp->gp_seq,
				rnp->gp_seq_needed);
			if (!rcu_is_leaf_node(rnp))
				continue;
			for_each_leaf_node_possible_cpu(rnp, cpu) {
				rdp = per_cpu_ptr(rsp->rda, cpu);
				if (rdp->gpwrap ||
				    ULONG_CMP_GE(rsp->gp_seq,
						 rdp->gp_seq_needed))
					continue;
				pr_info("\tcpu %d ->gp_seq_needed %lu\n",
					cpu, rdp->gp_seq_needed);
			}
		}
		/* sched_show_task(rsp->gp_kthread); */
	}
}
EXPORT_SYMBOL_GPL(show_rcu_gp_kthreads);

/*
 * Send along grace-period-related data for rcutorture diagnostics.
 */
void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
			    unsigned long *gp_seq)
{
	struct rcu_state *rsp = NULL;

	switch (test_type) {
	case RCU_FLAVOR:
		rsp = rcu_state_p;
		break;
	case RCU_BH_FLAVOR:
		rsp = &rcu_bh_state;
		break;
	case RCU_SCHED_FLAVOR:
		rsp = &rcu_sched_state;
		break;
	default:
		break;
	}
	if (rsp == NULL)
		return;
	*flags = READ_ONCE(rsp->gp_flags);
	*gp_seq = rcu_seq_current(&rsp->gp_seq);
}
EXPORT_SYMBOL_GPL(rcutorture_get_gp_data);

/*
 * Return the root node of the specified rcu_state structure.
 */
static struct rcu_node *rcu_get_root(struct rcu_state *rsp)
{
	return &rsp->node[0];
}

/*
 * Enter an RCU extended quiescent state, which can be either the
 * idle loop or adaptive-tickless usermode execution.
 *
 * We crowbar the ->dynticks_nmi_nesting field to zero to allow for
 * the possibility of usermode upcalls having messed up our count
 * of interrupt nesting level during the prior busy period.
 */
static void rcu_eqs_enter(bool user)
{
	struct rcu_state *rsp;
	struct rcu_data *rdp;
	struct rcu_dynticks *rdtp;

	rdtp = this_cpu_ptr(&rcu_dynticks);
	WRITE_ONCE(rdtp->dynticks_nmi_nesting, 0);
	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
		     rdtp->dynticks_nesting == 0);
	if (rdtp->dynticks_nesting != 1) {
		rdtp->dynticks_nesting--;
		return;
	}

	lockdep_assert_irqs_disabled();
	trace_rcu_dyntick(TPS("Start"), rdtp->dynticks_nesting, 0, rdtp->dynticks);
	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
	for_each_rcu_flavor(rsp) {
		rdp = this_cpu_ptr(rsp->rda);
		do_nocb_deferred_wakeup(rdp);
	}
	rcu_prepare_for_idle();
	WRITE_ONCE(rdtp->dynticks_nesting, 0); /* Avoid irq-access tearing. */
	rcu_dynticks_eqs_enter();
	rcu_dynticks_task_enter();
}

/**
 * rcu_idle_enter - inform RCU that current CPU is entering idle
 *
 * Enter idle mode, in other words, -leave- the mode in which RCU
 * read-side critical sections can occur.  (Though RCU read-side
 * critical sections can occur in irq handlers in idle, a possibility
 * handled by irq_enter() and irq_exit().)
 *
 * If you add or remove a call to rcu_idle_enter(), be sure to test with
 * CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_idle_enter(void)
{
	lockdep_assert_irqs_disabled();
	rcu_eqs_enter(false);
}

#ifdef CONFIG_NO_HZ_FULL
/**
 * rcu_user_enter - inform RCU that we are resuming userspace.
 *
 * Enter RCU idle mode right before resuming userspace.  No use of RCU
 * is permitted between this call and rcu_user_exit(). This way the
 * CPU doesn't need to maintain the tick for RCU maintenance purposes
 * when the CPU runs in userspace.
 *
 * If you add or remove a call to rcu_user_enter(), be sure to test with
 * CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_user_enter(void)
{
	lockdep_assert_irqs_disabled();
	rcu_eqs_enter(true);
}
#endif /* CONFIG_NO_HZ_FULL */

/**
 * rcu_nmi_exit - inform RCU of exit from NMI context
 *
 * If we are returning from the outermost NMI handler that interrupted an
 * RCU-idle period, update rdtp->dynticks and rdtp->dynticks_nmi_nesting
 * to let the RCU grace-period handling know that the CPU is back to
 * being RCU-idle.
 *
 * If you add or remove a call to rcu_nmi_exit(), be sure to test
 * with CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_nmi_exit(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);

	/*
	 * Check for ->dynticks_nmi_nesting underflow and bad ->dynticks.
	 * (We are exiting an NMI handler, so RCU better be paying attention
	 * to us!)
	 */
	WARN_ON_ONCE(rdtp->dynticks_nmi_nesting <= 0);
	WARN_ON_ONCE(rcu_dynticks_curr_cpu_in_eqs());

	/*
	 * If the nesting level is not 1, the CPU wasn't RCU-idle, so
	 * leave it in non-RCU-idle state.
	 */
	if (rdtp->dynticks_nmi_nesting != 1) {
		trace_rcu_dyntick(TPS("--="), rdtp->dynticks_nmi_nesting, rdtp->dynticks_nmi_nesting - 2, rdtp->dynticks);
		WRITE_ONCE(rdtp->dynticks_nmi_nesting, /* No store tearing. */
			   rdtp->dynticks_nmi_nesting - 2);
		return;
	}

	/* This NMI interrupted an RCU-idle CPU, restore RCU-idleness. */
	trace_rcu_dyntick(TPS("Startirq"), rdtp->dynticks_nmi_nesting, 0, rdtp->dynticks);
	WRITE_ONCE(rdtp->dynticks_nmi_nesting, 0); /* Avoid store tearing. */
	rcu_dynticks_eqs_enter();
}

/**
 * rcu_irq_exit - inform RCU that current CPU is exiting irq towards idle
 *
 * Exit from an interrupt handler, which might possibly result in entering
 * idle mode, in other words, leaving the mode in which read-side critical
 * sections can occur.  The caller must have disabled interrupts.
 *
 * This code assumes that the idle loop never does anything that might
 * result in unbalanced calls to irq_enter() and irq_exit().  If your
 * architecture's idle loop violates this assumption, RCU will give you what
 * you deserve, good and hard.  But very infrequently and irreproducibly.
 *
 * Use things like work queues to work around this limitation.
 *
 * You have been warned.
 *
 * If you add or remove a call to rcu_irq_exit(), be sure to test with
 * CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_irq_exit(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);

	lockdep_assert_irqs_disabled();
	if (rdtp->dynticks_nmi_nesting == 1)
		rcu_prepare_for_idle();
	rcu_nmi_exit();
	if (rdtp->dynticks_nmi_nesting == 0)
		rcu_dynticks_task_enter();
}

/*
 * Wrapper for rcu_irq_exit() where interrupts are enabled.
 *
 * If you add or remove a call to rcu_irq_exit_irqson(), be sure to test
 * with CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_irq_exit_irqson(void)
{
	unsigned long flags;

	local_irq_save(flags);
	rcu_irq_exit();
	local_irq_restore(flags);
}

/*
 * Exit an RCU extended quiescent state, which can be either the
 * idle loop or adaptive-tickless usermode execution.
 *
 * We crowbar the ->dynticks_nmi_nesting field to DYNTICK_IRQ_NONIDLE to
 * allow for the possibility of usermode upcalls messing up our count of
 * interrupt nesting level during the busy period that is just now starting.
 */
static void rcu_eqs_exit(bool user)
{
	struct rcu_dynticks *rdtp;
	long oldval;

	lockdep_assert_irqs_disabled();
	rdtp = this_cpu_ptr(&rcu_dynticks);
	oldval = rdtp->dynticks_nesting;
	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && oldval < 0);
	if (oldval) {
		rdtp->dynticks_nesting++;
		return;
	}
	rcu_dynticks_task_exit();
	rcu_dynticks_eqs_exit();
	rcu_cleanup_after_idle();
	trace_rcu_dyntick(TPS("End"), rdtp->dynticks_nesting, 1, rdtp->dynticks);
	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
	WRITE_ONCE(rdtp->dynticks_nesting, 1);
	WRITE_ONCE(rdtp->dynticks_nmi_nesting, DYNTICK_IRQ_NONIDLE);
}

/**
 * rcu_idle_exit - inform RCU that current CPU is leaving idle
 *
 * Exit idle mode, in other words, -enter- the mode in which RCU
 * read-side critical sections can occur.
 *
 * If you add or remove a call to rcu_idle_exit(), be sure to test with
 * CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_idle_exit(void)
{
	unsigned long flags;

	local_irq_save(flags);
	rcu_eqs_exit(false);
	local_irq_restore(flags);
}

#ifdef CONFIG_NO_HZ_FULL
/**
 * rcu_user_exit - inform RCU that we are exiting userspace.
 *
 * Exit RCU idle mode while entering the kernel because it can
 * run a RCU read side critical section anytime.
 *
 * If you add or remove a call to rcu_user_exit(), be sure to test with
 * CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_user_exit(void)
{
	rcu_eqs_exit(1);
}
#endif /* CONFIG_NO_HZ_FULL */

/**
 * rcu_nmi_enter - inform RCU of entry to NMI context
 *
 * If the CPU was idle from RCU's viewpoint, update rdtp->dynticks and
 * rdtp->dynticks_nmi_nesting to let the RCU grace-period handling know
 * that the CPU is active.  This implementation permits nested NMIs, as
 * long as the nesting level does not overflow an int.  (You will probably
 * run out of stack space first.)
 *
 * If you add or remove a call to rcu_nmi_enter(), be sure to test
 * with CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_nmi_enter(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
	long incby = 2;

	/* Complain about underflow. */
	WARN_ON_ONCE(rdtp->dynticks_nmi_nesting < 0);

	/*
	 * If idle from RCU viewpoint, atomically increment ->dynticks
	 * to mark non-idle and increment ->dynticks_nmi_nesting by one.
	 * Otherwise, increment ->dynticks_nmi_nesting by two.  This means
	 * if ->dynticks_nmi_nesting is equal to one, we are guaranteed
	 * to be in the outermost NMI handler that interrupted an RCU-idle
	 * period (observation due to Andy Lutomirski).
	 */
	if (rcu_dynticks_curr_cpu_in_eqs()) {
		rcu_dynticks_eqs_exit();
		incby = 1;
	}
	trace_rcu_dyntick(incby == 1 ? TPS("Endirq") : TPS("++="),
			  rdtp->dynticks_nmi_nesting,
			  rdtp->dynticks_nmi_nesting + incby, rdtp->dynticks);
	WRITE_ONCE(rdtp->dynticks_nmi_nesting, /* Prevent store tearing. */
		   rdtp->dynticks_nmi_nesting + incby);
	barrier();
}

/**
 * rcu_irq_enter - inform RCU that current CPU is entering irq away from idle
 *
 * Enter an interrupt handler, which might possibly result in exiting
 * idle mode, in other words, entering the mode in which read-side critical
 * sections can occur.  The caller must have disabled interrupts.
 *
 * Note that the Linux kernel is fully capable of entering an interrupt
 * handler that it never exits, for example when doing upcalls to user mode!
 * This code assumes that the idle loop never does upcalls to user mode.
 * If your architecture's idle loop does do upcalls to user mode (or does
 * anything else that results in unbalanced calls to the irq_enter() and
 * irq_exit() functions), RCU will give you what you deserve, good and hard.
 * But very infrequently and irreproducibly.
 *
 * Use things like work queues to work around this limitation.
 *
 * You have been warned.
 *
 * If you add or remove a call to rcu_irq_enter(), be sure to test with
 * CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_irq_enter(void)
{
	struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);

	lockdep_assert_irqs_disabled();
	if (rdtp->dynticks_nmi_nesting == 0)
		rcu_dynticks_task_exit();
	rcu_nmi_enter();
	if (rdtp->dynticks_nmi_nesting == 1)
		rcu_cleanup_after_idle();
}

/*
 * Wrapper for rcu_irq_enter() where interrupts are enabled.
 *
 * If you add or remove a call to rcu_irq_enter_irqson(), be sure to test
 * with CONFIG_RCU_EQS_DEBUG=y.
 */
void rcu_irq_enter_irqson(void)
{
	unsigned long flags;

	local_irq_save(flags);
	rcu_irq_enter();
	local_irq_restore(flags);
}

/**
 * rcu_is_watching - see if RCU thinks that the current CPU is idle
 *
 * Return true if RCU is watching the running CPU, which means that this
 * CPU can safely enter RCU read-side critical sections.  In other words,
 * if the current CPU is in its idle loop and is neither in an interrupt
 * or NMI handler, return true.
 */
bool notrace rcu_is_watching(void)
{
	bool ret;

	preempt_disable_notrace();
	ret = !rcu_dynticks_curr_cpu_in_eqs();
	preempt_enable_notrace();
	return ret;
}
EXPORT_SYMBOL_GPL(rcu_is_watching);

/*
 * If a holdout task is actually running, request an urgent quiescent
 * state from its CPU.  This is unsynchronized, so migrations can cause
 * the request to go to the wrong CPU.  Which is OK, all that will happen
 * is that the CPU's next context switch will be a bit slower and next
 * time around this task will generate another request.
 */
void rcu_request_urgent_qs_task(struct task_struct *t)
{
	int cpu;

	barrier();
	cpu = task_cpu(t);
	if (!task_curr(t))
		return; /* This task is not running on that CPU. */
	smp_store_release(per_cpu_ptr(&rcu_dynticks.rcu_urgent_qs, cpu), true);
}

#if defined(CONFIG_PROVE_RCU) && defined(CONFIG_HOTPLUG_CPU)

/*
 * Is the current CPU online as far as RCU is concerned?
 *
 * Disable preemption to avoid false positives that could otherwise
 * happen due to the current CPU number being sampled, this task being
 * preempted, its old CPU being taken offline, resuming on some other CPU,
 * then determining that its old CPU is now offline.  Because there are
 * multiple flavors of RCU, and because this function can be called in the
 * midst of updating the flavors while a given CPU coming online or going
 * offline, it is necessary to check all flavors.  If any of the flavors
 * believe that given CPU is online, it is considered to be online.
 *
 * Disable checking if in an NMI handler because we cannot safely
 * report errors from NMI handlers anyway.  In addition, it is OK to use
 * RCU on an offline processor during initial boot, hence the check for
 * rcu_scheduler_fully_active.
 */
bool rcu_lockdep_current_cpu_online(void)
{
	struct rcu_data *rdp;
	struct rcu_node *rnp;
	struct rcu_state *rsp;

	if (in_nmi() || !rcu_scheduler_fully_active)
		return true;
	preempt_disable();
	for_each_rcu_flavor(rsp) {
		rdp = this_cpu_ptr(rsp->rda);
		rnp = rdp->mynode;
		if (rdp->grpmask & rcu_rnp_online_cpus(rnp)) {
			preempt_enable();
			return true;
		}
	}
	preempt_enable();
	return false;
}
EXPORT_SYMBOL_GPL(rcu_lockdep_current_cpu_online);

#endif /* #if defined(CONFIG_PROVE_RCU) && defined(CONFIG_HOTPLUG_CPU) */

/**
 * rcu_is_cpu_rrupt_from_idle - see if idle or immediately interrupted from idle
 *
 * If the current CPU is idle or running at a first-level (not nested)
 * interrupt from idle, return true.  The caller must have at least
 * disabled preemption.
 */
static int rcu_is_cpu_rrupt_from_idle(void)
{
	return __this_cpu_read(rcu_dynticks.dynticks_nesting) <= 0 &&
	       __this_cpu_read(rcu_dynticks.dynticks_nmi_nesting) <= 1;
}

/*
 * We are reporting a quiescent state on behalf of some other CPU, so
 * it is our responsibility to check for and handle potential overflow
 * of the rcu_node ->gp_seq counter with respect to the rcu_data counters.
 * After all, the CPU might be in deep idle state, and thus executing no
 * code whatsoever.
 */
static void rcu_gpnum_ovf(struct rcu_node *rnp, struct rcu_data *rdp)
{
	raw_lockdep_assert_held_rcu_node(rnp);
	if (ULONG_CMP_LT(rcu_seq_current(&rdp->gp_seq) + ULONG_MAX / 4,
			 rnp->gp_seq))
		WRITE_ONCE(rdp->gpwrap, true);
	if (ULONG_CMP_LT(rdp->rcu_iw_gp_seq + ULONG_MAX / 4, rnp->gp_seq))
		rdp->rcu_iw_gp_seq = rnp->gp_seq + ULONG_MAX / 4;
}

/*
 * Snapshot the specified CPU's dynticks counter so that we can later
 * credit them with an implicit quiescent state.  Return 1 if this CPU
 * is in dynticks idle mode, which is an extended quiescent state.
 */
static int dyntick_save_progress_counter(struct rcu_data *rdp)
{
	rdp->dynticks_snap = rcu_dynticks_snap(rdp->dynticks);
	if (rcu_dynticks_in_eqs(rdp->dynticks_snap)) {
		trace_rcu_fqs(rdp->rsp->name, rdp->gp_seq, rdp->cpu, TPS("dti"));
		rcu_gpnum_ovf(rdp->mynode, rdp);
		return 1;
	}
	return 0;
}

/*
 * Handler for the irq_work request posted when a grace period has
 * gone on for too long, but not yet long enough for an RCU CPU
 * stall warning.  Set state appropriately, but just complain if
 * there is unexpected state on entry.
 */
static void rcu_iw_handler(struct irq_work *iwp)
{
	struct rcu_data *rdp;
	struct rcu_node *rnp;

	rdp = container_of(iwp, struct rcu_data, rcu_iw);
	rnp = rdp->mynode;
	raw_spin_lock_rcu_node(rnp);