The new macro LOCK_CONTENDED_FLAGS expands to the correct implementation
depending on the config options, so that IRQ's are re-enabled when
possible, but they remain disabled if CONFIG_LOCKDEP is set.
Signed-off-by: Petr Tesarik <ptesarik@xxxxxxx>
Signed-off-by: Robin Holt <holt@xxxxxxx>
---
include/linux/lockdep.h | 17 +++++++++++++++++
kernel/spinlock.c | 12 ++----------
2 files changed, 19 insertions(+), 10 deletions(-)
Index: rwlock/include/linux/lockdep.h
===================================================================
--- rwlock.orig/include/linux/lockdep.h 2008-11-04 05:54:18.456411408 -0600
+++ rwlock/include/linux/lockdep.h 2008-11-04 05:55:43.335302610 -0600
@@ -376,6 +376,23 @@ do { \
#endif /* CONFIG_LOCK_STAT */
+#ifdef CONFIG_LOCKDEP
+
+/*
+ * On lockdep we dont want the hand-coded irq-enable of
+ * _raw_*_lock_flags() code, because lockdep assumes
+ * that interrupts are not re-enabled during lock-acquire:
+ */
+#define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
+ LOCK_CONTENDED((_lock), (try), (lock))
+
+#else /* CONFIG_LOCKDEP */
+
+#define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
+ lockfl((_lock), (flags))
+
+#endif /* CONFIG_LOCKDEP */
+
#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS)
extern void early_init_irq_lock_class(void);
#else
Index: rwlock/kernel/spinlock.c
===================================================================
--- rwlock.orig/kernel/spinlock.c 2008-11-04 05:54:18.456411408 -0600
+++ rwlock/kernel/spinlock.c 2008-11-04 06:00:35.504744806 -0600
@@ -299,16 +299,8 @@ unsigned long __lockfunc _spin_lock_irqs
local_irq_save(flags);
preempt_disable();
spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
- /*
- * On lockdep we dont want the hand-coded irq-enable of
- * _raw_spin_lock_flags() code, because lockdep assumes
- * that interrupts are not re-enabled during lock-acquire:
- */
-#ifdef CONFIG_LOCKDEP
- LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
-#else
- _raw_spin_lock_flags(lock, &flags);
-#endif
+ LOCK_CONTENDED_FLAGS(lock, _raw_spin_trylock, _raw_spin_lock,
+ _raw_spin_lock_flags, &flags);
return flags;
}
EXPORT_SYMBOL(_spin_lock_irqsave_nested);
--
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