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Commit b7b6f94c authored by NeilBrown's avatar NeilBrown Committed by Paul E. McKenney
Browse files

rculist: Improve documentation for list_for_each_entry_from_rcu() 



Unfortunately the patch for adding list_for_each_entry_from_rcu()
wasn't the final patch after all review.  It is functionally
correct but the documentation was incomplete.

This patch adds this missing documentation which includes an update to
the documentation for list_for_each_entry_continue_rcu() to match the
documentation for the new list_for_each_entry_from_rcu(), and adds
list_for_each_entry_from_rcu() and the already existing
hlist_for_each_entry_from_rcu() to section 7 of whatisRCU.txt.

Reviewed-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 52e17ba1

Documentation/RCU/whatisRCU.txt

+2 −0
Original line number Diff line number Diff line
@@ -820,11 +820,13 @@ RCU list traversal: 
	list_next_rcu

	list_for_each_entry_rcu

	list_for_each_entry_continue_rcu

	list_for_each_entry_from_rcu

	hlist_first_rcu

	hlist_next_rcu

	hlist_pprev_rcu

	hlist_for_each_entry_rcu

	hlist_for_each_entry_rcu_bh

	hlist_for_each_entry_from_rcu

	hlist_for_each_entry_continue_rcu

	hlist_for_each_entry_continue_rcu_bh

	hlist_nulls_first_rcu

include/linux/rculist.h

+18 −1
Original line number Diff line number Diff line
@@ -396,7 +396,16 @@ static inline void list_splice_tail_init_rcu(struct list_head *list, 
 * @member:	the name of the list_head within the struct.

 *

 * Continue to iterate over list of given type, continuing after

 * the current position.

 * the current position which must have been in the list when the RCU read

 * lock was taken.

 * This would typically require either that you obtained the node from a

 * previous walk of the list in the same RCU read-side critical section, or

 * that you held some sort of non-RCU reference (such as a reference count)

 * to keep the node alive *and* in the list.

 *

 * This iterator is similar to list_for_each_entry_from_rcu() except

 * this starts after the given position and that one starts at the given

 * position.

 */

#define list_for_each_entry_continue_rcu(pos, head, member) 		\

	for (pos = list_entry_rcu(pos->member.next, typeof(*pos), member); \
@@ -411,6 +420,14 @@ static inline void list_splice_tail_init_rcu(struct list_head *list, 
 *

 * Iterate over the tail of a list starting from a given position,

 * which must have been in the list when the RCU read lock was taken.

 * This would typically require either that you obtained the node from a

 * previous walk of the list in the same RCU read-side critical section, or

 * that you held some sort of non-RCU reference (such as a reference count)

 * to keep the node alive *and* in the list.

 *

 * This iterator is similar to list_for_each_entry_continue_rcu() except

 * this starts from the given position and that one starts from the position

 * after the given position.

 */

#define list_for_each_entry_from_rcu(pos, head, member)			\

	for (; &(pos)->member != (head);					\