linux-kernel - [tip:locking/core] irq_work: Use lockdep to assert IRQs are disabled/enabled

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Message-ID: <tip-3c7169a3bf8216a56761a8edf775072dd36a00a0@git.kernel.org>
Date:   Wed, 8 Nov 2017 02:55:48 -0800
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, davem@...emloft.net, hpa@...or.com,
        frederic@...nel.org, tj@...nel.org, jiangshanlai@...il.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...nel.org,
        torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com
Subject: [tip:locking/core] irq_work: Use lockdep to assert IRQs are
 disabled/enabled

Commit-ID:  3c7169a3bf8216a56761a8edf775072dd36a00a0
Gitweb:     https://git.kernel.org/tip/3c7169a3bf8216a56761a8edf775072dd36a00a0
Author:     Frederic Weisbecker <frederic@...nel.org>
AuthorDate: Mon, 6 Nov 2017 16:01:26 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 8 Nov 2017 11:13:52 +0100

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>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Cc: David S . Miller <davem@...emloft.net>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Tejun Heo <tj@...nel.org>
Link: http://lkml.kernel.org/r/1509980490-4285-11-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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();