41 struct rcu_node {  struct
42 	raw_spinlock_t __private lock;	/* Root rcu_node's lock protects */  argument
50 				/*  In leaf rcu_node, each bit corresponds to */  argument
54 	unsigned long rcu_gp_init_mask;	/* Mask of offline CPUs at GP init. */
55 	unsigned long qsmaskinit;
59 	unsigned long qsmaskinitnext;
60 	unsigned long expmask;	/* CPUs or groups that need to check in */
86 				/*  rcu_node tree? */  argument
87 	struct rcu_node *parent;  argument
105 				/*  boosting is needed for this rcu_node */  argument
120 				/*  boosting for this rcu_node structure. */  argument
123 	unsigned long n_boosts;	/* Number of boosts for this rcu_node structure. */  argument
142  * Bitmasks in an rcu_node cover the interval [grplo, grphi] of CPU IDs, and  argument