Commit 47d63d7a authored by SeongJae Park's avatar SeongJae Park Committed by Paul E. McKenney
Browse files

Docs/RCU/rculist_nulls: Fix text about atomic_set_release() 

The document says we can avoid extra _release() in insert function when
hlist_nulls is used, but that's not true[1].  Drop it.

[1] https://lore.kernel.org/rcu/46440869-644a-4982-b790-b71b43976c66@paulmck-laptop/



Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent d186204a

Documentation/RCU/rculist_nulls.rst

+4 −2
Original line number Diff line number Diff line
@@ -140,8 +140,7 @@ very very fast (before the end of RCU grace period) 
Avoiding extra smp_rmb()

========================



With hlist_nulls we can avoid extra smp_rmb() in lockless_lookup()

and extra _release() in insert function.

With hlist_nulls we can avoid extra smp_rmb() in lockless_lookup().



For example, if we choose to store the slot number as the 'nulls'

end-of-list marker for each slot of the hash table, we can detect
@@ -196,6 +195,9 @@ Note that using hlist_nulls means the type of 'obj_node' field of 
2) Insert algorithm

-------------------



Same to the above one, but uses hlist_nulls_add_head_rcu() instead of

hlist_add_head_rcu().



::



  /*