linux-kernel - [PATCH v2 4/4] Docs/RCU/rculist_nulls: Fix wrong text about atomic_set

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Message-Id: <20230613182434.88317-5-sj@kernel.org>
Date:   Tue, 13 Jun 2023 18:24:34 +0000
From:   SeongJae Park <sj@...nel.org>
To:     paulmck@...nel.org
Cc:     SeongJae Park <sj@...nel.org>, joel@...lfernandes.org,
        mmpgouride@...il.com, corbet@....net, rcu@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] Docs/RCU/rculist_nulls: Fix wrong 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: SeongJae Park <sj@...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 5cd6f3f8810f..018cc100d19b 100644
--- a/Documentation/RCU/rculist_nulls.rst
+++ b/Documentation/RCU/rculist_nulls.rst
@@ -129,8 +129,7 @@ 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
@@ -182,6 +181,9 @@ scan the list again without harm.
 2) Insert algorithm
 -------------------
 
+Same to the above one, but uses hlist_nulls_add_head_rcu() instead of
+hlist_add_head_rcu().
+
 ::
 
   /*
-- 
2.25.1