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

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Date:   Wed, 8 Nov 2017 02:52:25 -0800
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tj@...nel.org, mingo@...nel.org, tglx@...utronix.de, hpa@...or.com,
        davem@...emloft.net, frederic@...nel.org, jiangshanlai@...il.com,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        paulmck@...ux.vnet.ibm.com, peterz@...radead.org
Subject: [tip:locking/core] irq/softirqs: Use lockdep to assert IRQs are
 disabled/enabled

Commit-ID:  f71b74bca637fca7de78f1d44eaefde5bc900f9f
Gitweb:     https://git.kernel.org/tip/f71b74bca637fca7de78f1d44eaefde5bc900f9f
Author:     Frederic Weisbecker <frederic@...nel.org>
AuthorDate: Mon, 6 Nov 2017 16:01:18 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 8 Nov 2017 11:13:48 +0100

irq/softirqs: 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/1509980490-4285-3-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/softirq.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 4e09821..662f7b1b 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -137,7 +137,7 @@ EXPORT_SYMBOL(__local_bh_disable_ip);
 
 static void __local_bh_enable(unsigned int cnt)
 {
-	WARN_ON_ONCE(!irqs_disabled());
+	lockdep_assert_irqs_disabled();
 
 	if (softirq_count() == (cnt & SOFTIRQ_MASK))
 		trace_softirqs_on(_RET_IP_);
@@ -158,7 +158,8 @@ EXPORT_SYMBOL(_local_bh_enable);
 
 void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
 {
-	WARN_ON_ONCE(in_irq() || irqs_disabled());
+	WARN_ON_ONCE(in_irq());
+	lockdep_assert_irqs_enabled();
 #ifdef CONFIG_TRACE_IRQFLAGS
 	local_irq_disable();
 #endif
@@ -396,9 +397,8 @@ void irq_exit(void)
 #ifndef __ARCH_IRQ_EXIT_IRQS_DISABLED
 	local_irq_disable();
 #else
-	WARN_ON_ONCE(!irqs_disabled());
+	lockdep_assert_irqs_disabled();
 #endif
-
 	account_irq_exit_time(current);
 	preempt_count_sub(HARDIRQ_OFFSET);
 	if (!in_interrupt() && local_softirq_pending())
@@ -488,7 +488,7 @@ EXPORT_SYMBOL(__tasklet_hi_schedule);
 
 void __tasklet_hi_schedule_first(struct tasklet_struct *t)
 {
-	BUG_ON(!irqs_disabled());
+	lockdep_assert_irqs_disabled();
 
 	t->next = __this_cpu_read(tasklet_hi_vec.head);
 	__this_cpu_write(tasklet_hi_vec.head, t);