/* Common code for rcu_idle_enter() and rcu_irq_exit(), see kernel/rcu/tree.c. */
static void rcu_idle_enter_common(long long newval)
{
	if (newval) {
		RCU_TRACE(trace_rcu_dyntick(TPS("--="),
					    rcu_dynticks_nesting, newval));
		rcu_dynticks_nesting = newval;
		return;
	}
	RCU_TRACE(trace_rcu_dyntick(TPS("Start"),
				    rcu_dynticks_nesting, newval));
	if (IS_ENABLED(CONFIG_RCU_TRACE) && !is_idle_task(current)) {
		struct task_struct *idle __maybe_unused = idle_task(smp_processor_id());

		RCU_TRACE(trace_rcu_dyntick(TPS("Entry error: not idle task"),
					    rcu_dynticks_nesting, newval));
		ftrace_dump(DUMP_ALL);
		WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
			  current->pid, current->comm,
			  idle->pid, idle->comm); /* must be idle task! */
	}
	rcu_sched_qs(); /* implies rcu_bh_inc() */
	barrier();
	rcu_dynticks_nesting = newval;
}

/*
 * Invoke the RCU callbacks on the specified rcu_ctrlkblk structure
 * whose grace period has elapsed.
 */
static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp)
{
	const char *rn = NULL;
	struct rcu_head *next, *list;
	unsigned long flags;
	RCU_TRACE(int cb_count = 0);

	/* If no RCU callbacks ready to invoke, just return. */
	if (&rcp->rcucblist == rcp->donetail) {
		if (!__covered14) {__covered14 = 1; total_covered += 1;}
		RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, 0, -1));
		RCU_TRACE(trace_rcu_batch_end(rcp->name, 0,
!!ACCESS_ONCE(rcp->rcucblist),
need_resched(),
is_idle_task(current),
false));
		return;
	}

	/* Move the ready-to-invoke callbacks to a local list. */
	local_irq_save(flags);
	RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, rcp->qlen, -1));
	list = rcp->rcucblist;
	rcp->rcucblist = *rcp->donetail;
	*rcp->donetail = NULL;
	if (rcp->curtail == rcp->donetail) {
		if (!__covered15) {__covered15 = 1; total_covered += 1;}
		rcp->curtail = &rcp->rcucblist;
	}
	rcp->donetail = &rcp->rcucblist;
	local_irq_restore(flags);

	/* Invoke the callbacks on the local list. */
	RCU_TRACE(rn = rcp->name);
	while (list) {
		if (!__covered16) {__covered16 = 1; total_covered += 1;}
		next = list->next;
		prefetch(next);
		debug_rcu_head_unqueue(list);
		local_bh_disable();
		__rcu_reclaim(rn, list);
		local_bh_enable();
		list = next;
		RCU_TRACE(cb_count++);
	}
	RCU_TRACE(rcu_trace_sub_qlen(rcp, cb_count));
	RCU_TRACE(trace_rcu_batch_end(rcp->name,
cb_count, 0, need_resched(),
is_idle_task(current),
false));
}

/*
 * Helper function for call_rcu() and call_rcu_bh().
 */
static void __call_rcu(struct rcu_head *head,
		       void (*func)(struct rcu_head *rcu),
		       struct rcu_ctrlblk *rcp)
{
	unsigned long flags;

	head->func = func;
	head->next = NULL;

	local_irq_save(flags);
	*rcp->curtail = head;
	rcp->curtail = &head->next;
	RCU_TRACE(rcp->qlen++);
	local_irq_restore(flags);
}

/*
 * Check to see if the scheduling-clock interrupt came from an extended
 * quiescent state, and, if so, tell RCU about it.  This function must
 * be called from hardirq context.  It is normally called from the
 * scheduling-clock interrupt.
 */
void rcu_check_callbacks(int user)
{
	RCU_TRACE(check_cpu_stalls());
	if (user || rcu_is_cpu_rrupt_from_idle()) {
		if (!__covered11) {__covered11 = 1; total_covered += 1;}
		rcu_sched_qs();
	}
	else if (!in_softirq()) {
		if (!__covered12) {__covered12 = 1; total_covered += 1;}
		rcu_bh_qs();
	}
	if (user) {
		if (!__covered13) {__covered13 = 1; total_covered += 1;}
		rcu_note_voluntary_context_switch(current);
	}
}

/*
 * Helper function for call_rcu() and call_rcu_bh().
 */
static void __call_rcu(struct rcu_head *head,
		       void (*func)(struct rcu_head *rcu),
		       struct rcu_ctrlblk *rcp)
{
	unsigned long flags;

	debug_rcu_head_queue(head);
	head->func = func;
	head->next = NULL;

	local_irq_save(flags);
	*rcp->curtail = head;
	rcp->curtail = &head->next;
 /* MUTANT (rep_op) */	RCU_TRACE(rcp->qlen--);
	local_irq_restore(flags);
}

/*
 * Helper function for call_rcu() and call_rcu_bh().
 */
static void __call_rcu(struct rcu_head *head,
		       void (*func)(struct rcu_head *rcu),
		       struct rcu_ctrlblk *rcp)
{
	unsigned long flags;

	debug_rcu_head_queue(head);
  mutant_covered = 1;
 /* MUTANT (del_stmt) */ /* 	head->func = func; */ 
	head->next = NULL;

	local_irq_save(flags);
	*rcp->curtail = head;
	rcp->curtail = &head->next;
	RCU_TRACE(rcp->qlen++);
	local_irq_restore(flags);
}

/*
 * Helper function for call_rcu() and call_rcu_bh().
 */
static void __call_rcu(struct rcu_head *head,
		       rcu_callback_t func,
		       struct rcu_ctrlblk *rcp)
{
	unsigned long flags;

	debug_rcu_head_queue(head);
	head->func = func;
	head->next = NULL;

	local_irq_save(flags);
	*rcp->curtail = head;
	rcp->curtail = &head->next;
	RCU_TRACE(rcp->qlen++);
	local_irq_restore(flags);

	if (unlikely(is_idle_task(current))) {
		/* force scheduling for rcu_sched_qs() */
		resched_cpu(0);
	}
}

/*
 * Invoke the RCU callbacks on the specified rcu_ctrlkblk structure
 * whose grace period has elapsed.
 */
static void rcu_process_callbacks(struct rcu_ctrlblk *rcp)
{
	char *rn = NULL;
	struct rcu_head *next, *list;
	unsigned long flags;
	RCU_TRACE(int cb_count = 0);

	/* If no RCU callbacks ready to invoke, just return. */
	if (&rcp->rcucblist == rcp->donetail) {
		RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, -1));
		RCU_TRACE(trace_rcu_batch_end(rcp->name, 0));
		return;
	}

	/* Move the ready-to-invoke callbacks to a local list. */
	local_irq_save(flags);
	RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, -1));
	list = rcp->rcucblist;
	rcp->rcucblist = *rcp->donetail;
	*rcp->donetail = NULL;
	if (rcp->curtail == rcp->donetail)
		rcp->curtail = &rcp->rcucblist;
	rcu_preempt_remove_callbacks(rcp);
	rcp->donetail = &rcp->rcucblist;
	local_irq_restore(flags);

	/* Invoke the callbacks on the local list. */
	RCU_TRACE(rn = rcp->name);
	while (list) {
		next = list->next;
		prefetch(next);
		debug_rcu_head_unqueue(list);
		local_bh_disable();
		__rcu_reclaim(rn, list);
		local_bh_enable();
		list = next;
		RCU_TRACE(cb_count++);
	}
	RCU_TRACE(rcu_trace_sub_qlen(rcp, cb_count));
	RCU_TRACE(trace_rcu_batch_end(rcp->name, cb_count));
}