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-rw-r--r--Documentation/RCU/whatisRCU.txt13
1 files changed, 8 insertions, 5 deletions
diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt
index 469a58b2e67e..1dc00ee97163 100644
--- a/Documentation/RCU/whatisRCU.txt
+++ b/Documentation/RCU/whatisRCU.txt
@@ -323,15 +323,17 @@ used as follows:
323 Defer Protect 323 Defer Protect
324 324
325a. synchronize_rcu() rcu_read_lock() / rcu_read_unlock() 325a. synchronize_rcu() rcu_read_lock() / rcu_read_unlock()
326 call_rcu() 326 call_rcu() rcu_dereference()
327 327
328b. call_rcu_bh() rcu_read_lock_bh() / rcu_read_unlock_bh() 328b. call_rcu_bh() rcu_read_lock_bh() / rcu_read_unlock_bh()
329 rcu_dereference_bh()
329 330
330c. synchronize_sched() rcu_read_lock_sched() / rcu_read_unlock_sched() 331c. synchronize_sched() rcu_read_lock_sched() / rcu_read_unlock_sched()
331 preempt_disable() / preempt_enable() 332 preempt_disable() / preempt_enable()
332 local_irq_save() / local_irq_restore() 333 local_irq_save() / local_irq_restore()
333 hardirq enter / hardirq exit 334 hardirq enter / hardirq exit
334 NMI enter / NMI exit 335 NMI enter / NMI exit
336 rcu_dereference_sched()
335 337
336These three mechanisms are used as follows: 338These three mechanisms are used as follows:
337 339
@@ -781,9 +783,8 @@ Linux-kernel source code, but it helps to have a full list of the
781APIs, since there does not appear to be a way to categorize them 783APIs, since there does not appear to be a way to categorize them
782in docbook. Here is the list, by category. 784in docbook. Here is the list, by category.
783 785
784RCU pointer/list traversal: 786RCU list traversal:
785 787
786 rcu_dereference
787 list_for_each_entry_rcu 788 list_for_each_entry_rcu
788 hlist_for_each_entry_rcu 789 hlist_for_each_entry_rcu
789 hlist_nulls_for_each_entry_rcu 790 hlist_nulls_for_each_entry_rcu
@@ -809,7 +810,7 @@ RCU: Critical sections Grace period Barrier
809 810
810 rcu_read_lock synchronize_net rcu_barrier 811 rcu_read_lock synchronize_net rcu_barrier
811 rcu_read_unlock synchronize_rcu 812 rcu_read_unlock synchronize_rcu
812 synchronize_rcu_expedited 813 rcu_dereference synchronize_rcu_expedited
813 call_rcu 814 call_rcu
814 815
815 816
@@ -817,7 +818,7 @@ bh: Critical sections Grace period Barrier
817 818
818 rcu_read_lock_bh call_rcu_bh rcu_barrier_bh 819 rcu_read_lock_bh call_rcu_bh rcu_barrier_bh
819 rcu_read_unlock_bh synchronize_rcu_bh 820 rcu_read_unlock_bh synchronize_rcu_bh
820 synchronize_rcu_bh_expedited 821 rcu_dereference_bh synchronize_rcu_bh_expedited
821 822
822 823
823sched: Critical sections Grace period Barrier 824sched: Critical sections Grace period Barrier
@@ -826,12 +827,14 @@ sched: Critical sections Grace period Barrier
826 rcu_read_unlock_sched call_rcu_sched 827 rcu_read_unlock_sched call_rcu_sched
827 [preempt_disable] synchronize_sched_expedited 828 [preempt_disable] synchronize_sched_expedited
828 [and friends] 829 [and friends]
830 rcu_dereference_sched
829 831
830 832
831SRCU: Critical sections Grace period Barrier 833SRCU: Critical sections Grace period Barrier
832 834
833 srcu_read_lock synchronize_srcu N/A 835 srcu_read_lock synchronize_srcu N/A
834 srcu_read_unlock synchronize_srcu_expedited 836 srcu_read_unlock synchronize_srcu_expedited
837 srcu_dereference
835 838
836SRCU: Initialization/cleanup 839SRCU: Initialization/cleanup
837 init_srcu_struct 840 init_srcu_struct