From: "Paul E. McKenney" <paulmck@kernel.org>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com,
rostedt@goodmis.org, "Paul E. McKenney" <paulmck@kernel.org>,
Frederic Weisbecker <frederic@kernel.org>
Subject: [PATCH rcu 7/8] rcu: Add lockdep_assert_irqs_disabled() to rcu_exp_need_qs()
Date: Thu, 12 Dec 2024 10:39:35 -0800 [thread overview]
Message-ID: <20241212183936.1936196-7-paulmck@kernel.org> (raw)
In-Reply-To: <928b8031-2bfe-4c90-9952-7d331e027ae3@paulmck-laptop>
Callers to rcu_exp_need_qs() are supposed to disable interrupts, so this
commit enlists lockdep's aid in checking this.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>
---
kernel/rcu/tree_exp.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index ce5b09921d04e..77efed89c79e3 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -722,6 +722,7 @@ static void rcu_exp_sel_wait_wake(unsigned long s)
/* Request an expedited quiescent state. */
static void rcu_exp_need_qs(void)
{
+ lockdep_assert_irqs_disabled();
ASSERT_EXCLUSIVE_WRITER_SCOPED(*this_cpu_ptr(&rcu_data.cpu_no_qs.b.exp));
__this_cpu_write(rcu_data.cpu_no_qs.b.exp, true);
/* Store .exp before .rcu_urgent_qs. */
--
2.40.1
next prev parent reply other threads:[~2024-12-12 18:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-12 18:39 [PATCH rcu 0/8] Miscellaneous fixes for v6.14 Paul E. McKenney
2024-12-12 18:39 ` [PATCH rcu 1/8] rcu: Report callbacks enqueued on offline CPU blind spot Paul E. McKenney
2024-12-12 18:39 ` [PATCH rcu 2/8] rcu: Make rcu_report_exp_cpu_mult() caller acquire lock Paul E. McKenney
2024-12-12 18:39 ` [PATCH rcu 3/8] rcu: Move rcu_report_exp_rdp() setting of ->cpu_no_qs.b.exp under lock Paul E. McKenney
2024-12-12 18:39 ` [PATCH rcu 4/8] rcu: Replace open-coded rcu_exp_need_qs() from rcu_exp_handler() with call Paul E. McKenney
2024-12-12 18:39 ` [PATCH rcu 5/8] rcu: Make preemptible rcu_exp_handler() check idempotency Paul E. McKenney
2024-12-12 18:39 ` [PATCH rcu 6/8] rcu: Add KCSAN exclusive-writer assertions for rdp->cpu_no_qs.b.exp Paul E. McKenney
2024-12-12 18:39 ` Paul E. McKenney [this message]
2024-12-12 18:39 ` [PATCH rcu 8/8] MAINTAINERS: Update RCU git tree Paul E. McKenney
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