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doc: Clarify use of slab constructors and SLAB_TYPESAFE_BY_RCU 

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>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Paul E. McKenney 2023-12-11 11:55:17 -08:00 committed by Boqun Feng
parent 3b239b308e
commit 56823e9f60
1 changed files with 2 additions and 2 deletions
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Documentation/RCU/whatisRCU.rst
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@ -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