73 struct rcu_node {  struct
74 	raw_spinlock_t __private lock;	/* Root rcu_node's lock protects */  argument
79 				/*  behind the root rcu_node's gpnum. */  argument
82 				/*  behind the root rcu_node's gpnum. */  argument
85 				/*  In leaf rcu_node, each bit corresponds to */  argument
89 	unsigned long qsmaskinit;
115 				/*  rcu_node tree? */  argument
116 	struct rcu_node *parent;  argument
134 				/*  boosting is needed for this rcu_node */  argument
146 				/*  boosting for this rcu_node structure. */  argument
169  * Bitmasks in an rcu_node cover the interval [grplo, grphi] of CPU IDs, and  argument