linux-kernel - [RFC lockdep 1/4] lockdep/selftest: Make HARDIRQ context threaded

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Date:   Tue,  8 Dec 2020 18:31:09 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     linux-kernel@...r.kernel.org, rcu@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Boqun Feng <boqun.feng@...il.com>
Subject: [RFC lockdep 1/4] lockdep/selftest: Make HARDIRQ context threaded

Since we now use spinlock_t instead of raw_spinlock_t in lockdep self
tests, we should make the emulated HARDIRQ context threaded, otherwise,
spinlock_t cannot be used in the HARDIRQ context and some test cases
will fail because of wait context checking when
PROVE_RAW_LOCK_NESTING=y.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 lib/locking-selftest.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index afa7d4bb291f..0af91a07fd18 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -186,6 +186,7 @@ static void init_shared_classes(void)
 #define HARDIRQ_ENTER()				\
 	local_irq_disable();			\
 	__irq_enter();				\
+	lockdep_hardirq_threaded();		\
 	WARN_ON(!in_irq());
 
 #define HARDIRQ_EXIT()				\
-- 
2.29.2