linux-kernel - [GIT pull] locking/urgent for v5.10-rc5

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Date:   Sun, 22 Nov 2020 14:47:23 -0000
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] locking/urgent for v5.10-rc5

Linus,

please pull the latest locking/urgent branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-urgent-2020-11-22

up to:  43be4388e94b: lockdep: Put graph lock/unlock under lock_recursion protection


A single fix for lockdep which makes the recursion protection cover graph
lock/unlock.


Thanks,

	tglx

------------------>
Boqun Feng (1):
      lockdep: Put graph lock/unlock under lock_recursion protection


 kernel/locking/lockdep.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index d9fb9e19d2ed..c1418b47f625 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -108,19 +108,21 @@ static inline void lockdep_lock(void)
 {
 	DEBUG_LOCKS_WARN_ON(!irqs_disabled());
 
+	__this_cpu_inc(lockdep_recursion);
 	arch_spin_lock(&__lock);
 	__owner = current;
-	__this_cpu_inc(lockdep_recursion);
 }
 
 static inline void lockdep_unlock(void)
 {
+	DEBUG_LOCKS_WARN_ON(!irqs_disabled());
+
 	if (debug_locks && DEBUG_LOCKS_WARN_ON(__owner != current))
 		return;
 
-	__this_cpu_dec(lockdep_recursion);
 	__owner = NULL;
 	arch_spin_unlock(&__lock);
+	__this_cpu_dec(lockdep_recursion);
 }
 
 static inline bool lockdep_assert_locked(void)