Defer Protect
a. synchronize_rcu() rcu_read_lock() / rcu_read_unlock()
- call_rcu()
+ call_rcu() rcu_dereference()
b. call_rcu_bh() rcu_read_lock_bh() / rcu_read_unlock_bh()
+ rcu_dereference_bh()
-c. synchronize_sched() preempt_disable() / preempt_enable()
+c. synchronize_sched() rcu_read_lock_sched() / rcu_read_unlock_sched()
+ preempt_disable() / preempt_enable()
local_irq_save() / local_irq_restore()
hardirq enter / hardirq exit
NMI enter / NMI exit
+ rcu_dereference_sched()
These three mechanisms are used as follows:
APIs, since there does not appear to be a way to categorize them
in docbook. Here is the list, by category.
-RCU pointer/list traversal:
+RCU list traversal:
- rcu_dereference
list_for_each_entry_rcu
hlist_for_each_entry_rcu
hlist_nulls_for_each_entry_rcu
rcu_read_lock synchronize_net rcu_barrier
rcu_read_unlock synchronize_rcu
- synchronize_rcu_expedited
+ rcu_dereference synchronize_rcu_expedited
call_rcu
rcu_read_lock_bh call_rcu_bh rcu_barrier_bh
rcu_read_unlock_bh synchronize_rcu_bh
- synchronize_rcu_bh_expedited
+ rcu_dereference_bh synchronize_rcu_bh_expedited
sched: Critical sections Grace period Barrier
rcu_read_unlock_sched call_rcu_sched
[preempt_disable] synchronize_sched_expedited
[and friends]
+ rcu_dereference_sched
SRCU: Critical sections Grace period Barrier
srcu_read_lock synchronize_srcu N/A
srcu_read_unlock synchronize_srcu_expedited
+ srcu_dereference
SRCU: Initialization/cleanup
init_srcu_struct