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rcu: Add data structures for synchronize_rcu()

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

Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit is contained in:
Uladzislau Rezki (Sony) 2024-03-08 18:34:04 +01:00
parent 39cd87c4eb
commit dfd458a95d
1 changed files with 14 additions and 0 deletions
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14
kernel/rcu/tree.h
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@ -315,6 +315,13 @@ do { \
__set_current_state(TASK_RUNNING); \ __set_current_state(TASK_RUNNING); \
} while (0) } 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 * RCU global state, including node hierarchy. This hierarchy is
* represented in "heap" form in a dense array. The root (first level) * represented in "heap" form in a dense array. The root (first level)
@ -400,6 +407,13 @@ struct rcu_state {
/* Synchronize offline with */ /* Synchronize offline with */
/* GP pre-initialization. */ /* GP pre-initialization. */
int nocb_is_setup; /* nocb is setup from boot */ 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. */ /* Values for rcu_state structure's gp_flags field. */