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From: paulmck@kernel.org
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
	mingo@kernel.org, jiangshanlai@gmail.com,
	akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
	josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
	rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
	fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
	"Paul E. McKenney" <paulmck@kernel.org>
Subject: [PATCH tip/core/rcu 2/8] doc: Remove obsolete RCU-bh and RCU-sched update-side API members
Date: Tue,  5 Jan 2021 16:54:01 -0800
Message-ID: <20210106005407.12295-2-paulmck@kernel.org> (raw)
In-Reply-To: <20210106005334.GA12159@paulmck-ThinkPad-P72>

From: "Paul E. McKenney" <paulmck@kernel.org>

synchronize_rcu_bh(), synchronize_rcu_bh_expedited(), call_rcu_bh(),
rcu_barrier_bh(), synchronize_sched(), synchronize_rcu_sched_expedited(),
call_rcu_sched(), and rcu_barrier_sched() no longer exist, so this
commit removes mention of them.

Reported-by: Joel Fernandes <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
 .../RCU/Design/Requirements/Requirements.rst       | 28 +++++++++++-----------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/Documentation/RCU/Design/Requirements/Requirements.rst b/Documentation/RCU/Design/Requirements/Requirements.rst
index 9b23be6..1e3df77 100644
--- a/Documentation/RCU/Design/Requirements/Requirements.rst
+++ b/Documentation/RCU/Design/Requirements/Requirements.rst
@@ -2438,13 +2438,13 @@ glance as if rcu_read_unlock_bh() was executing very slowly.
 
 The `RCU-bh
 API <https://lwn.net/Articles/609973/#RCU%20Per-Flavor%20API%20Table>`__
-includes rcu_read_lock_bh(), rcu_read_unlock_bh(),
-rcu_dereference_bh(), rcu_dereference_bh_check(),
-synchronize_rcu_bh(), synchronize_rcu_bh_expedited(),
-call_rcu_bh(), rcu_barrier_bh(), and
-rcu_read_lock_bh_held(). However, the update-side APIs are now
-simple wrappers for other RCU flavors, namely RCU-sched in
-CONFIG_PREEMPT=n kernels and RCU-preempt otherwise.
+includes rcu_read_lock_bh(), rcu_read_unlock_bh(), rcu_dereference_bh(),
+rcu_dereference_bh_check(), and rcu_read_lock_bh_held(). However, the
+old RCU-bh update-side APIs are now gone, replaced by synchronize_rcu(),
+synchronize_rcu_expedited(), call_rcu(), and rcu_barrier().  In addition,
+anything that disables bottom halves also marks an RCU-bh read-side
+critical section, including local_bh_disable() and local_bh_enable(),
+local_irq_save() and local_irq_restore(), and so on.
 
 Sched Flavor (Historical)
 ~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -2481,13 +2481,13 @@ The `RCU-sched
 API <https://lwn.net/Articles/609973/#RCU%20Per-Flavor%20API%20Table>`__
 includes rcu_read_lock_sched(), rcu_read_unlock_sched(),
 rcu_read_lock_sched_notrace(), rcu_read_unlock_sched_notrace(),
-rcu_dereference_sched(), rcu_dereference_sched_check(),
-synchronize_sched(), synchronize_rcu_sched_expedited(),
-call_rcu_sched(), rcu_barrier_sched(), and
-rcu_read_lock_sched_held(). However, anything that disables
-preemption also marks an RCU-sched read-side critical section, including
-preempt_disable() and preempt_enable(), local_irq_save() and
-local_irq_restore(), and so on.
+rcu_dereference_sched(), rcu_dereference_sched_check(), and
+rcu_read_lock_sched_held().  However, the old RCU-sched update-side APIs
+are now gone, replaced by synchronize_rcu(), synchronize_rcu_expedited(),
+call_rcu(), and rcu_barrier().  In addition, anything that disables
+preemption also marks an RCU-sched read-side critical section,
+including preempt_disable() and preempt_enable(), local_irq_save()
+and local_irq_restore(), and so on.
 
 Sleepable RCU
 ~~~~~~~~~~~~~
-- 
2.9.5


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-06  0:53 [PATCH tip/core/rcu 0/8] Documentation updates for v5.12 Paul E. McKenney
2021-01-06  0:54 ` [PATCH tip/core/rcu 1/8] docs: Remove redundant "``" from Requirements.rst paulmck
2021-01-06  0:54 ` paulmck [this message]
2021-01-06  0:54 ` [PATCH tip/core/rcu 3/8] list: Fix a typo at the kernel-doc markup paulmck
2021-01-06  0:54 ` [PATCH tip/core/rcu 4/8] docs: Fix typos and drop/fix dead links in RCU documentation paulmck
2021-01-06  0:54 ` [PATCH tip/core/rcu 5/8] doc: Update RCU requirements RCU_INIT_POINTER() description paulmck
2021-01-06  0:54 ` [PATCH tip/core/rcu 6/8] doc: Remove obsolete rcutree.rcu_idle_lazy_gp_delay boot parameter paulmck
2021-01-06  0:54 ` [PATCH tip/core/rcu 7/8] doc: Update RCU's requirements page about the PREEMPT_RT wiki paulmck
2021-01-06  0:54 ` [PATCH tip/core/rcu 8/8] doc: Use CONFIG_PREEMPTION paulmck

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