linux-kernel - [PATCH 28/32] locking/lockdep: Update check

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Date:   Tue, 12 Feb 2019 18:14:19 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Pavan Kondeti <pkondeti@...eaurora.org>,
        Ingo Molnar <mingo@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: [PATCH 28/32] locking/lockdep: Update check_flags() according to new layout

current->softirqs_enabled used to mean that either all or no softirqs
are enabled. Now things are getting a bit different with the new per
vector masking extension after which current->softirqs_enabled will
stay on as long as there is a single vector still enabled.

Let's adapt the check to the updated semantics. We can't deduce much
from softirq_count() alone anymore except when it's 0.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc: Joel Fernandes <joel@...lfernandes.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Pavan Kondeti <pkondeti@...eaurora.org>
Cc: Paul E . McKenney <paulmck@...ux.vnet.ibm.com>
Cc: David S . Miller <davem@...emloft.net>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 kernel/locking/lockdep.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 9bb39677fd97..acd82145f6a6 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -3909,13 +3909,8 @@ static void check_flags(unsigned long flags)
 	 * check if not in hardirq contexts:
 	 */
 	if (!hardirq_count()) {
-		if (softirq_count()) {
-			/* like the above, but with softirqs */
-			DEBUG_LOCKS_WARN_ON(current->softirqs_enabled);
-		} else {
-			/* lick the above, does it taste good? */
+		if (!softirq_count())
 			DEBUG_LOCKS_WARN_ON(!current->softirqs_enabled);
-		}
 	}
 
 	if (!debug_locks)
-- 
2.17.1