linux-kernel - [PATCH tip/core/rcu 4/7] userfaultfd: Replace spin_is

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Date:   Sun, 11 Nov 2018 12:04:40 -0800
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        Lance Roy <ldr709@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>
Subject: [PATCH tip/core/rcu 4/7] userfaultfd: Replace spin_is_locked() with lockdep

From: Lance Roy <ldr709@...il.com>

lockdep_assert_held() is better suited to checking locking requirements,
since it only checks if the current thread holds the lock regardless of
whether someone else does. This is also a step towards possibly removing
spin_is_locked().

Signed-off-by: Lance Roy <ldr709@...il.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: <linux-fsdevel@...r.kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
---
 fs/userfaultfd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 356d2b8568c1..681881dc8a9d 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -926,7 +926,7 @@ static inline struct userfaultfd_wait_queue *find_userfault_in(
 	wait_queue_entry_t *wq;
 	struct userfaultfd_wait_queue *uwq;
 
-	VM_BUG_ON(!spin_is_locked(&wqh->lock));
+	lockdep_assert_held(&wqh->lock);
 
 	uwq = NULL;
 	if (!waitqueue_active(wqh))
-- 
2.17.1