From: Boqun Feng <boqun.feng@gmail.com>
To: linux-kernel@vger.kernel.org, rcu@vger.kernel.org,
linux-doc@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>,
"Paul E. McKenney" <paulmck@kernel.org>,
Frederic Weisbecker <frederic@kernel.org>,
Neeraj Upadhyay <neeraj.iitr10@gmail.com>,
Joel Fernandes <joel@joelfernandes.org>,
Josh Triplett <josh@joshtriplett.org>,
Boqun Feng <boqun.feng@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Zqiang <qiang.zhang1211@gmail.com>
Subject: [PATCH 7/8] doc: Clarify use of slab constructors and SLAB_TYPESAFE_BY_RCU
Date: Thu, 25 Jan 2024 19:58:10 -0800 [thread overview]
Message-ID: <20240126035816.3129296-8-boqun.feng@gmail.com> (raw)
In-Reply-To: <20240126035816.3129296-1-boqun.feng@gmail.com>
From: "Paul E. McKenney" <paulmck@kernel.org>
This commit explicitly states that you should initialize any locks to
be used by readers in your SLAB_TYPESAFE_BY_RCU constructor.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
Documentation/RCU/whatisRCU.rst | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/RCU/whatisRCU.rst b/Documentation/RCU/whatisRCU.rst
index 246ce0d0b4d1..872ac665223f 100644
--- a/Documentation/RCU/whatisRCU.rst
+++ b/Documentation/RCU/whatisRCU.rst
@@ -963,8 +963,8 @@ unfortunately any spinlock in a ``SLAB_TYPESAFE_BY_RCU`` object must be
initialized after each and every call to kmem_cache_alloc(), which renders
reference-free spinlock acquisition completely unsafe. Therefore, when
using ``SLAB_TYPESAFE_BY_RCU``, make proper use of a reference counter.
-(Those willing to use a kmem_cache constructor may also use locking,
-including cache-friendly sequence locking.)
+(Those willing to initialize their locks in a kmem_cache constructor
+may also use locking, including cache-friendly sequence locking.)
With traditional reference counting -- such as that implemented by the
kref library in Linux -- there is typically code that runs when the last
--
2.43.0
next prev parent reply other threads:[~2024-01-26 3:59 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-26 3:58 [PATCH 0/8] RCU doc updates for v6.9 Boqun Feng
2024-01-26 3:58 ` [PATCH 1/8] doc: Spinlocks are implied RCU readers Boqun Feng
2024-01-26 3:58 ` [PATCH 2/8] doc: Make whatisRCU.rst note that spinlocks are " Boqun Feng
2024-01-26 3:58 ` [PATCH 3/8] doc: Make checklist.rst note that spinlocks are implied " Boqun Feng
2024-01-26 3:58 ` [PATCH 4/8] doc: Add CONFIG_RCU_STRICT_GRACE_PERIOD to checklist.rst Boqun Feng
2024-01-26 3:58 ` [PATCH 5/8] doc: Add EARLY flag to early-parsed kernel boot parameters Boqun Feng
2024-01-26 3:58 ` [PATCH 6/8] context_tracking: Fix kerneldoc headers for __ct_user_{enter,exit}() Boqun Feng
2024-01-26 3:58 ` Boqun Feng [this message]
2024-01-26 3:58 ` [PATCH 8/8] doc: Update checklist.rst discussion of callback execution Boqun Feng
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