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

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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: SeongJae Park <sj@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
SeongJae Park 2023-06-16 23:36:26 +00:00 committed by Paul E. McKenney
parent d186204a98
commit 47d63d7a39
1 changed files with 4 additions and 2 deletions
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Documentation/RCU/rculist_nulls.rst
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@ -140,8 +140,7 @@ very very fast (before the end of RCU grace period)
Avoiding extra smp_rmb() Avoiding extra smp_rmb()
======================== ========================
With hlist_nulls we can avoid extra smp_rmb() in lockless_lookup() With hlist_nulls we can avoid extra smp_rmb() in lockless_lookup().
and extra _release() in insert function.
For example, if we choose to store the slot number as the 'nulls' 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 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 2) Insert algorithm
------------------- -------------------
Same to the above one, but uses hlist_nulls_add_head_rcu() instead of
hlist_add_head_rcu().
:: ::
/* /*