linux-kernel - [PATCH rcu 4/7] doc: Fix list: rcu_access

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Date:   Wed, 31 Aug 2022 11:06:22 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 4/7] doc: Fix list: rcu_access_pointer() is not lockdep-checked

The rcu_access_pointer() macro does not consult lockdep by design because
it is intended to be used outside of RCU read-side critical sections.
This commit therefore makes a separate list for it in whatisRCU.rst.

Similarly, RCU_LOCKDEP_WARN(), rcu_sleep_check(), and RCU_NONIDLE()
do not do anything with pointer access.  This commit therefore creates
a separate utility-API list for them.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 Documentation/RCU/whatisRCU.rst | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Documentation/RCU/whatisRCU.rst b/Documentation/RCU/whatisRCU.rst
index 77ea260efd120..6940e0fe8599b 100644
--- a/Documentation/RCU/whatisRCU.rst
+++ b/Documentation/RCU/whatisRCU.rst
@@ -1057,14 +1057,20 @@ SRCU: Initialization/cleanup::
 	init_srcu_struct
 	cleanup_srcu_struct
 
-All: lockdep-checked RCU-protected pointer access::
+All: lockdep-checked RCU utility APIs::
 
-	rcu_access_pointer
-	rcu_dereference_raw
 	RCU_LOCKDEP_WARN
 	rcu_sleep_check
 	RCU_NONIDLE
 
+All: Unchecked RCU-protected pointer access::
+
+	rcu_dereference_raw
+
+All: Unchecked RCU-protected pointer access with dereferencing prohibited::
+
+	rcu_access_pointer
+
 See the comment headers in the source code (or the docbook generated
 from them) for more information.
 
-- 
2.31.1.189.g2e36527f23