149 struct rcu_data {  struct
151 	unsigned long	gp_seq;		/* Track rsp->rcu_gp_seq counter. */
152 	unsigned long	gp_seq_needed;	/* Track furthest future GP request. */
153 	union rcu_noqs	cpu_no_qs;	/* No QSes yet for this CPU. */
154 	bool		core_needs_qs;	/* Core waits for quiesc state. */
155 	bool		beenonline;	/* CPU online at least once. */
156 	bool		gpwrap;		/* Possible ->gp_seq wrap. */
157 	bool		exp_deferred_qs; /* This CPU awaiting a deferred QS? */
158 	struct rcu_node *mynode;	/* This CPU's leaf of hierarchy */
159 	unsigned long grpmask;		/* Mask to apply to leaf qsmask. */
160 	unsigned long	ticks_this_gp;	/* The number of scheduling-clock */
164 	struct irq_work defer_qs_iw;	/* Obtain later scheduler attention. */
165 	bool defer_qs_iw_pending;	/* Scheduler attention pending? */
168 	struct rcu_segcblist cblist;	/* Segmented callback list, with */
171 	long		qlen_last_fqs_check;
173 	unsigned long	n_force_qs_snap;
175 	long		blimit;		/* Upper limit on a processed batch */
178 	int dynticks_snap;		/* Per-GP tracking for dynticks. */
179 	long dynticks_nesting;		/* Track process nesting level. */
180 	long dynticks_nmi_nesting;	/* Track irq/NMI nesting level. */
181 	atomic_t dynticks;		/* Even value for idle, else odd. */
182 	bool rcu_need_heavy_qs;		/* GP old, so heavy quiescent state! */
183 	bool rcu_urgent_qs;		/* GP old need light quiescent state. */
185 	bool all_lazy;			/* All CPU's CBs lazy at idle start? */
186 	unsigned long last_accelerate;	/* Last jiffy CBs were accelerated. */
187 	unsigned long last_advance_all;	/* Last jiffy CBs were all advanced. */
188 	int tick_nohz_enabled_snap;	/* Previously seen value from sysfs. */
192 	struct rcu_head barrier_head;
193 	int exp_dynticks_snap;		/* Double-check need for IPI. */
197 	struct swait_queue_head nocb_cb_wq; /* For nocb kthreads to sleep on. */
198 	struct task_struct *nocb_gp_kthread;
199 	raw_spinlock_t nocb_lock;	/* Guard following pair of fields. */
223 	struct rcu_data *nocb_next_cb_rdp;  argument
227 	struct rcu_data *nocb_gp_rdp ____cacheline_internodealigned_in_smp;  argument
252 /* Values for nocb_defer_wakeup field in struct rcu_data. */  argument