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rcu: Add lockdep_assert_irqs_disabled() to raw_spin_unlock_rcu_node() macros 

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@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-11-19 13:30:33 -08:00
parent a649d25dcc
commit 7dffe01765
1 changed files with 13 additions and 3 deletions
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16
kernel/rcu/rcu.h
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@ -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) \
({ \