linux-kernel - [tip:locking/core] sched/clock, sched/cputime: Use lockdep to assert IRQs are disabled/enabled

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Message-ID: <tip-2c11dba00a39007b457c7607c1b1a4db95ca04bc@git.kernel.org>
Date:   Wed, 8 Nov 2017 02:56:12 -0800
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, davem@...emloft.net, paulmck@...ux.vnet.ibm.com,
        peterz@...radead.org, frederic@...nel.org, jiangshanlai@...il.com,
        tj@...nel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, hpa@...or.com, tglx@...utronix.de
Subject: [tip:locking/core] sched/clock, sched/cputime: Use lockdep to
 assert IRQs are disabled/enabled

Commit-ID:  2c11dba00a39007b457c7607c1b1a4db95ca04bc
Gitweb:     https://git.kernel.org/tip/2c11dba00a39007b457c7607c1b1a4db95ca04bc
Author:     Frederic Weisbecker <frederic@...nel.org>
AuthorDate: Mon, 6 Nov 2017 16:01:27 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 8 Nov 2017 11:13:53 +0100

sched/clock, sched/cputime: 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/1509980490-4285-12-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/clock.c   | 2 +-
 kernel/sched/cputime.c | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c
index ca0f8fc..e086bab 100644
--- a/kernel/sched/clock.c
+++ b/kernel/sched/clock.c
@@ -388,7 +388,7 @@ void sched_clock_tick(void)
 	if (unlikely(!sched_clock_running))
 		return;
 
-	WARN_ON_ONCE(!irqs_disabled());
+	lockdep_assert_irqs_disabled();
 
 	scd = this_scd();
 	__scd_stamp(scd);
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 14d2dbf..9be8b68 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -259,8 +259,7 @@ static inline u64 account_other_time(u64 max)
 {
 	u64 accounted;
 
-	/* Shall be converted to a lockdep-enabled lightweight check */
-	WARN_ON_ONCE(!irqs_disabled());
+	lockdep_assert_irqs_disabled();
 
 	accounted = steal_account_process_time(max);