40 struct rcu_node {  struct
41 	raw_spinlock_t __private lock;	/* Root rcu_node's lock protects */  argument
49 				/*  In leaf rcu_node, each bit corresponds to */  argument
53 	unsigned long rcu_gp_init_mask;	/* Mask of offline CPUs at GP init. */
54 	unsigned long qsmaskinit;
58 	unsigned long qsmaskinitnext;
83 				/*  rcu_node tree? */  argument
84 	struct rcu_node *parent;  argument
102 				/*  boosting is needed for this rcu_node */  argument
114 				/*  boosting for this rcu_node structure. */  argument
131  * Bitmasks in an rcu_node cover the interval [grplo, grphi] of CPU IDs, and  argument