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

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Message-ID: <tip-ebf3adbad012b89c4a51a3beae718a587d988a3a@git.kernel.org>
Date:   Wed, 8 Nov 2017 02:53:14 -0800
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jiangshanlai@...il.com,
        paulmck@...ux.vnet.ibm.com, davem@...emloft.net, hpa@...or.com,
        peterz@...radead.org, torvalds@...ux-foundation.org, tj@...nel.org,
        mingo@...nel.org, tglx@...utronix.de, frederic@...nel.org
Subject: [tip:locking/core] timers/nohz: Use lockdep to assert IRQs are
 disabled/enabled

Commit-ID:  ebf3adbad012b89c4a51a3beae718a587d988a3a
Gitweb:     https://git.kernel.org/tip/ebf3adbad012b89c4a51a3beae718a587d988a3a
Author:     Frederic Weisbecker <frederic@...nel.org>
AuthorDate: Mon, 6 Nov 2017 16:01:20 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 8 Nov 2017 11:13:49 +0100

timers/nohz: 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/1509980490-4285-5-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/time/tick-sched.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index c7a899c..dd4b7b4 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -198,7 +198,7 @@ static bool check_tick_dependency(atomic_t *dep)
 
 static bool can_stop_full_tick(int cpu, struct tick_sched *ts)
 {
-	WARN_ON_ONCE(!irqs_disabled());
+	lockdep_assert_irqs_disabled();
 
 	if (unlikely(!cpu_online(cpu)))
 		return false;
@@ -960,8 +960,7 @@ void tick_nohz_idle_enter(void)
 {
 	struct tick_sched *ts;
 
-	WARN_ON_ONCE(irqs_disabled());
-
+	lockdep_assert_irqs_enabled();
 	/*
 	 * Update the idle state in the scheduler domain hierarchy
 	 * when tick_nohz_stop_sched_tick() is called from the idle loop.