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

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Date:   Wed, 8 Nov 2017 02:54:09 -0800
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, peterz@...radead.org, davem@...emloft.net,
        torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, tj@...nel.org,
        jiangshanlai@...il.com, frederic@...nel.org, mingo@...nel.org
Subject: [tip:locking/core] smp/core: Use lockdep to assert IRQs are
 disabled/enabled

Commit-ID:  83efcbd028ad3aec36b5a3882cfa32490c135df7
Gitweb:     https://git.kernel.org/tip/83efcbd028ad3aec36b5a3882cfa32490c135df7
Author:     Frederic Weisbecker <frederic@...nel.org>
AuthorDate: Mon, 6 Nov 2017 16:01:22 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 8 Nov 2017 11:13:50 +0100

smp/core: 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/1509980490-4285-7-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index c94dd85..084c8b3 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -213,7 +213,7 @@ static void flush_smp_call_function_queue(bool warn_cpu_offline)
 	call_single_data_t *csd, *csd_next;
 	static bool warned;
 
-	WARN_ON(!irqs_disabled());
+	lockdep_assert_irqs_disabled();
 
 	head = this_cpu_ptr(&call_single_queue);
 	entry = llist_del_all(head);