linux-kernel - [PATCH rcu 4/7] Docs/RCU/rculist_nulls: Assign 'obj' before use from the examples

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Message-Id: <20230717180110.1097362-4-paulmck@kernel.org>
Date:   Mon, 17 Jul 2023 11:01:07 -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>,
        Joel Fernandes <joel@...lfernandes.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 4/7] Docs/RCU/rculist_nulls: Assign 'obj' before use from the examples

From: SeongJae Park <sj@...nel.org>

Lookup example code snippets in rculist_nulls.rst are using 'obj'
without assignment.  Fix the code to assign it properly.

Signed-off-by: SeongJae Park <sj@...nel.org>
Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 Documentation/RCU/rculist_nulls.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/RCU/rculist_nulls.rst b/Documentation/RCU/rculist_nulls.rst
index 25b739885cfa..4d6f077552ed 100644
--- a/Documentation/RCU/rculist_nulls.rst
+++ b/Documentation/RCU/rculist_nulls.rst
@@ -56,7 +56,7 @@ but a version with an additional memory barrier (smp_rmb())
     struct hlist_node *node, *next;
     for (pos = rcu_dereference((head)->first);
          pos && ({ next = pos->next; smp_rmb(); prefetch(next); 1; }) &&
-         ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1; });
+         ({ obj = hlist_entry(pos, typeof(*obj), member); 1; });
          pos = rcu_dereference(next))
       if (obj->key == key)
         return obj;
@@ -68,7 +68,7 @@ And note the traditional hlist_for_each_entry_rcu() misses this smp_rmb()::
   struct hlist_node *node;
   for (pos = rcu_dereference((head)->first);
        pos && ({ prefetch(pos->next); 1; }) &&
-       ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1; });
+       ({ obj = hlist_entry(pos, typeof(*obj), member); 1; });
        pos = rcu_dereference(pos->next))
     if (obj->key == key)
       return obj;
-- 
2.40.1