From: "Paul E. McKenney" <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,
Zhouyi Zhou <zhouzhouyi@gmail.com>,
"Paul E . McKenney" <paulmck@kernel.org>
Subject: [PATCH rcu 5/5] rcu: Fix macro name CONFIG_TASKS_RCU_TRACE
Date: Wed, 21 Jul 2021 13:38:18 -0700 [thread overview]
Message-ID: <20210721203818.3398345-5-paulmck@kernel.org> (raw)
In-Reply-To: <20210721203758.GA3386731@paulmck-ThinkPad-P17-Gen-1>
From: Zhouyi Zhou <zhouzhouyi@gmail.com>
This commit fixes several typos where CONFIG_TASKS_RCU_TRACE should
instead be CONFIG_TASKS_TRACE_RCU. Among other things, these typos
could cause CONFIG_TASKS_TRACE_RCU_READ_MB=y kernels to suffer from
memory-ordering bugs that could result in false-positive quiescent
states and too-short grace periods.
Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
include/linux/rcupdate.h | 2 +-
kernel/rcu/tree_plugin.h | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index d9680b798b211..955c82b4737c5 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -167,7 +167,7 @@ void synchronize_rcu_tasks(void);
# define synchronize_rcu_tasks synchronize_rcu
# endif
-# ifdef CONFIG_TASKS_RCU_TRACE
+# ifdef CONFIG_TASKS_TRACE_RCU
# define rcu_tasks_trace_qs(t) \
do { \
if (!likely(READ_ONCE((t)->trc_reader_checked)) && \
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index de1dc3bb7f701..6ce104242b23d 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2982,17 +2982,17 @@ static void noinstr rcu_dynticks_task_exit(void)
/* Turn on heavyweight RCU tasks trace readers on idle/user entry. */
static void rcu_dynticks_task_trace_enter(void)
{
-#ifdef CONFIG_TASKS_RCU_TRACE
+#ifdef CONFIG_TASKS_TRACE_RCU
if (IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB))
current->trc_reader_special.b.need_mb = true;
-#endif /* #ifdef CONFIG_TASKS_RCU_TRACE */
+#endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
}
/* Turn off heavyweight RCU tasks trace readers on idle/user exit. */
static void rcu_dynticks_task_trace_exit(void)
{
-#ifdef CONFIG_TASKS_RCU_TRACE
+#ifdef CONFIG_TASKS_TRACE_RCU
if (IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB))
current->trc_reader_special.b.need_mb = false;
-#endif /* #ifdef CONFIG_TASKS_RCU_TRACE */
+#endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
}
--
2.31.1.189.g2e36527f23
prev parent reply other threads:[~2021-07-21 20:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-21 20:37 [PATCH rcu 0/5] Tasks-RCU updates for v5.15 Paul E. McKenney
2021-07-21 20:38 ` [PATCH rcu 1/5] rcu-tasks: Add comments explaining task_struct strategy Paul E. McKenney
2021-07-21 20:38 ` [PATCH rcu 2/5] rcu-tasks: Mark ->trc_reader_nesting data races Paul E. McKenney
2021-07-21 20:38 ` [PATCH rcu 3/5] rcu-tasks: Mark ->trc_reader_special.b.need_qs " Paul E. McKenney
2021-07-21 20:38 ` [PATCH rcu 4/5] rcu-tasks: Fix synchronize_rcu_rude() typo in comment Paul E. McKenney
2021-07-21 20:38 ` Paul E. McKenney [this message]
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