rcutorture: Test call_srcu() with preemption disabled and not

paulmckrcu · Joel Fernandes · commit 95c7d025cc8c · 2026-03-30T15:48:14.000-04:00
This commit tests invoking call_srcu() with preemption both enabled
and disabled, via acquiring of pi lock.

[ Joel: reword commit message. ]

Signed-off-by: Paul E. McKenney &lt;paulmck@kernel.org&gt;
Signed-off-by: Joel Fernandes &lt;joelagnelf@nvidia.com&gt;
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
@@ -842,7 +842,14 @@ static unsigned long srcu_torture_completed(void)
 
 static void srcu_torture_deferred_free(struct rcu_torture *rp)
 {
+	unsigned long flags;
+	bool lockit = jiffies & 0x1;
+
+	if (lockit)
+		raw_spin_lock_irqsave(&current->pi_lock, flags);
 	call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb);
+	if (lockit)
+		raw_spin_unlock_irqrestore(&current->pi_lock, flags);
 }
 
 static void srcu_torture_synchronize(void)

Original file line number	Diff line number	Diff line change
`@@ -842,7 +842,14 @@ static unsigned long srcu_torture_completed(void)`
`842`	`842`
`843`	`843`	`static void srcu_torture_deferred_free(struct rcu_torture *rp)`
`844`	`844`	`{`
	`845`	`+ unsigned long flags;`
	`846`	`+ bool lockit = jiffies & 0x1;`
	`847`	`+`
	`848`	`+ if (lockit)`
	`849`	`+ raw_spin_lock_irqsave(&current->pi_lock, flags);`
`845`	`850`	`call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb);`
	`851`	`+ if (lockit)`
	`852`	`+ raw_spin_unlock_irqrestore(&current->pi_lock, flags);`
`846`	`853`	`}`
`847`	`854`
`848`	`855`	`static void srcu_torture_synchronize(void)`