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

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Date:   Wed, 8 Nov 2017 02:57:01 -0800
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, mingo@...nel.org, tj@...nel.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        davem@...emloft.net, jiangshanlai@...il.com,
        paulmck@...ux.vnet.ibm.com, tglx@...utronix.de, hpa@...or.com,
        frederic@...nel.org
Subject: [tip:locking/core] netpoll: Use lockdep to assert IRQs are
 disabled/enabled

Commit-ID:  af0733937317e1e03b60f3af8cf9cd59d665593c
Gitweb:     https://git.kernel.org/tip/af0733937317e1e03b60f3af8cf9cd59d665593c
Author:     Frederic Weisbecker <frederic@...nel.org>
AuthorDate: Mon, 6 Nov 2017 16:01:29 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 8 Nov 2017 11:13:54 +0100

netpoll: 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/1509980490-4285-14-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 net/core/netpoll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 912731b..57557a6 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -334,7 +334,7 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
 	/* It is up to the caller to keep npinfo alive. */
 	struct netpoll_info *npinfo;
 
-	WARN_ON_ONCE(!irqs_disabled());
+	lockdep_assert_irqs_disabled();
 
 	npinfo = rcu_dereference_bh(np->dev->npinfo);
 	if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {