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Message-Id: <20230717180110.1097362-7-paulmck@kernel.org>
Date: Mon, 17 Jul 2023 11:01:10 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com,
rostedt@...dmis.org, SeongJae Park <sj@...nel.org>,
"Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 7/7] Docs/RCU/rculist_nulls: Fix text about atomic_set_release()
From: SeongJae Park <sj@...nel.org>
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@...nel.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
Documentation/RCU/rculist_nulls.rst | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/Documentation/RCU/rculist_nulls.rst b/Documentation/RCU/rculist_nulls.rst
index 1fb086066377..21e40fcc08de 100644
--- a/Documentation/RCU/rculist_nulls.rst
+++ b/Documentation/RCU/rculist_nulls.rst
@@ -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().
+
::
/*
--
2.40.1
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