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-rw-r--r--Documentation/RCU/whatisRCU.txt16
1 files changed, 10 insertions, 6 deletions
diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt
index d542ca243b80..1dc00ee97163 100644
--- a/Documentation/RCU/whatisRCU.txt
+++ b/Documentation/RCU/whatisRCU.txt
@@ -323,14 +323,17 @@ used as follows:
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:
@@ -780,9 +783,8 @@ Linux-kernel source code, but it helps to have a full list of the
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
@@ -808,7 +810,7 @@ RCU: Critical sections Grace period Barrier
rcu_read_lock synchronize_net rcu_barrier
rcu_read_unlock synchronize_rcu
- synchronize_rcu_expedited
+ rcu_dereference synchronize_rcu_expedited
call_rcu
@@ -816,7 +818,7 @@ bh: Critical sections Grace period Barrier
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
@@ -825,12 +827,14 @@ 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