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Message-Id: <20210106005736.12613-4-paulmck@kernel.org>
Date: Tue, 5 Jan 2021 16:57:34 -0800
From: paulmck@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
jiangshanlai@...il.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,
"Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH tip/core/rcu 4/6] rcu: Add lockdep_assert_irqs_disabled() to raw_spin_unlock_rcu_node() macros
From: "Paul E. McKenney" <paulmck@...nel.org>
This commit adds a lockdep_assert_irqs_disabled() call to the
helper macros that release the rcu_node structure's ->lock, namely
to raw_spin_unlock_rcu_node(), raw_spin_unlock_irq_rcu_node() and
raw_spin_unlock_irqrestore_rcu_node(). The point of this is to help track
down a situation where lockdep appears to be insisting that interrupts
are enabled while holding an rcu_node structure's ->lock.
Link: https://lore.kernel.org/lkml/20201111133813.GA81547@elver.google.com/
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
kernel/rcu/rcu.h | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index e01cba5..839f5be 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -378,7 +378,11 @@ do { \
smp_mb__after_unlock_lock(); \
} while (0)
-#define raw_spin_unlock_rcu_node(p) raw_spin_unlock(&ACCESS_PRIVATE(p, lock))
+#define raw_spin_unlock_rcu_node(p) \
+do { \
+ lockdep_assert_irqs_disabled(); \
+ raw_spin_unlock(&ACCESS_PRIVATE(p, lock)); \
+} while (0)
#define raw_spin_lock_irq_rcu_node(p) \
do { \
@@ -387,7 +391,10 @@ do { \
} while (0)
#define raw_spin_unlock_irq_rcu_node(p) \
- raw_spin_unlock_irq(&ACCESS_PRIVATE(p, lock))
+do { \
+ lockdep_assert_irqs_disabled(); \
+ raw_spin_unlock_irq(&ACCESS_PRIVATE(p, lock)); \
+} while (0)
#define raw_spin_lock_irqsave_rcu_node(p, flags) \
do { \
@@ -396,7 +403,10 @@ do { \
} while (0)
#define raw_spin_unlock_irqrestore_rcu_node(p, flags) \
- raw_spin_unlock_irqrestore(&ACCESS_PRIVATE(p, lock), flags)
+do { \
+ lockdep_assert_irqs_disabled(); \
+ raw_spin_unlock_irqrestore(&ACCESS_PRIVATE(p, lock), flags); \
+} while (0)
#define raw_spin_trylock_rcu_node(p) \
({ \
--
2.9.5
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