Commit dfd458a9 authored by Uladzislau Rezki (Sony)'s avatar Uladzislau Rezki (Sony)
Browse files

rcu: Add data structures for synchronize_rcu() 



The synchronize_rcu() call is going to be reworked, thus
this patch adds dedicated fields into the rcu_state structure.

Reviewed-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Signed-off-by: default avatarUladzislau Rezki (Sony) <urezki@gmail.com>
parent 39cd87c4

kernel/rcu/tree.h

+14 −0
Original line number Diff line number Diff line
@@ -315,6 +315,13 @@ do { \ 
	__set_current_state(TASK_RUNNING);				\

} while (0)



#define SR_NORMAL_GP_WAIT_HEAD_MAX 5



struct sr_wait_node {

	atomic_t inuse;

	struct llist_node node;

};



/*

 * RCU global state, including node hierarchy.  This hierarchy is

 * represented in "heap" form in a dense array.  The root (first level)
@@ -400,6 +407,13 @@ struct rcu_state { 
						/* Synchronize offline with */

						/*  GP pre-initialization. */

	int nocb_is_setup;			/* nocb is setup from boot */



	/* synchronize_rcu() part. */

	struct llist_head srs_next;	/* request a GP users. */

	struct llist_node *srs_wait_tail; /* wait for GP users. */

	struct llist_node *srs_done_tail; /* ready for GP users. */

	struct sr_wait_node srs_wait_nodes[SR_NORMAL_GP_WAIT_HEAD_MAX];

	struct work_struct srs_cleanup_work;

};



/* Values for rcu_state structure's gp_flags field. */