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author | NeilBrown <neilb@suse.com> | 2018-06-18 14:22:40 +1000 |
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committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-07-12 15:39:25 -0700 |
commit | b7b6f94cf6e6d961f78064315b6f5de5d9c6414b (patch) | |
tree | 77eec6446fb2291cdd9f40c91fbc056d928b2d7a /include/linux/rculist.h | |
parent | 52e17ba1d063ab6adb367f288babd380e30bad46 (diff) | |
download | linux-stable-b7b6f94cf6e6d961f78064315b6f5de5d9c6414b.tar.gz linux-stable-b7b6f94cf6e6d961f78064315b6f5de5d9c6414b.tar.bz2 linux-stable-b7b6f94cf6e6d961f78064315b6f5de5d9c6414b.zip |
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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rculist.h')
-rw-r--r-- | include/linux/rculist.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/include/linux/rculist.h b/include/linux/rculist.h index 36df6ccbc874..4786c2235b98 100644 --- a/include/linux/rculist.h +++ b/include/linux/rculist.h @@ -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); \ |