linux-kernel - [PATCH 10/14] irq_work: Use lockdep to assert IRQs are disabled/enabled

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Date:   Mon,  6 Nov 2017 16:01:26 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Tejun Heo <tj@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "David S . Miller" <davem@...emloft.net>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH 10/14] irq_work: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This
way the sanity check only shows overhead when concurrency correctness
debug code is enabled.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/irq_work.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index bcf107c..8995796 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -188,7 +188,7 @@ void irq_work_tick(void)
  */
 void irq_work_sync(struct irq_work *work)
 {
-	WARN_ON_ONCE(irqs_disabled());
+	lockdep_assert_irqs_enabled();
 
 	while (work->flags & IRQ_WORK_BUSY)
 		cpu_relax();
-- 
2.7.4