rcu: Add lockdep_assert_irqs_disabled() to rcu_exp_need_qs()

paulmckrcu · urezki · commit 1bb03ad383a7 · 2024-12-14T17:10:38.000+01:00
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 &lt;paulmck@kernel.org&gt;
Cc: Frederic Weisbecker &lt;frederic@kernel.org&gt;
Signed-off-by: Uladzislau Rezki (Sony) &lt;urezki@gmail.com&gt;
diff --git 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. */

Original file line number	Diff line number	Diff line change
`@@ -722,6 +722,7 @@ static void rcu_exp_sel_wait_wake(unsigned long s)`
`722`	`722`	`/* Request an expedited quiescent state. */`
`723`	`723`	`static void rcu_exp_need_qs(void)`
`724`	`724`	`{`
	`725`	`+ lockdep_assert_irqs_disabled();`
`725`	`726`	`ASSERT_EXCLUSIVE_WRITER_SCOPED(*this_cpu_ptr(&rcu_data.cpu_no_qs.b.exp));`
`726`	`727`	`__this_cpu_write(rcu_data.cpu_no_qs.b.exp, true);`
`727`	`728`	`/* Store .exp before .rcu_urgent_qs. */`