*
* Author: Zwane Mwaikambo <zwane@fsmlabs.com>
*
- * Copyright (2004) Ingo Molnar
+ * Copyright (2004, 2005) Ingo Molnar
+ *
+ * This file contains the spinlock/rwlock implementations for the
+ * SMP and the DEBUG_SPINLOCK cases. (UP-nondebug inlines them)
+ *
+ * Note that some architectures have special knowledge about the
+ * stack frames of these functions in their profile_pc. If you
+ * change anything significant here that could change the stack
+ * frame contact the architecture maintainers.
*/
-#include <linux/config.h>
#include <linux/linkage.h>
#include <linux/preempt.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
#include <linux/module.h>
-/*
- * Generic declaration of the raw read_trylock() function,
- * architectures are supposed to optimize this:
- */
-int __lockfunc generic_raw_read_trylock(rwlock_t *lock)
-{
- _raw_read_lock(lock);
- return 1;
-}
-EXPORT_SYMBOL(generic_raw_read_trylock);
-
+#ifndef _spin_trylock
int __lockfunc _spin_trylock(spinlock_t *lock)
{
- preempt_disable();
- if (_raw_spin_trylock(lock))
- return 1;
-
- preempt_enable();
- return 0;
+ return __spin_trylock(lock);
}
EXPORT_SYMBOL(_spin_trylock);
+#endif
+#ifndef _read_trylock
int __lockfunc _read_trylock(rwlock_t *lock)
{
- preempt_disable();
- if (_raw_read_trylock(lock))
- return 1;
-
- preempt_enable();
- return 0;
+ return __read_trylock(lock);
}
EXPORT_SYMBOL(_read_trylock);
+#endif
+#ifndef _write_trylock
int __lockfunc _write_trylock(rwlock_t *lock)
{
- preempt_disable();
- if (_raw_write_trylock(lock))
- return 1;
-
- preempt_enable();
- return 0;
+ return __write_trylock(lock);
}
EXPORT_SYMBOL(_write_trylock);
+#endif
-#ifndef CONFIG_PREEMPT
+/*
+ * If lockdep is enabled then we use the non-preemption spin-ops
+ * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
+ * not re-enabled during lock-acquire (which the preempt-spin-ops do):
+ */
+#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
+#ifndef _read_lock
void __lockfunc _read_lock(rwlock_t *lock)
{
- preempt_disable();
- _raw_read_lock(lock);
+ __read_lock(lock);
}
EXPORT_SYMBOL(_read_lock);
+#endif
+#ifndef _spin_lock_irqsave
unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
{
- unsigned long flags;
-
- local_irq_save(flags);
- preempt_disable();
- _raw_spin_lock_flags(lock, flags);
- return flags;
+ return __spin_lock_irqsave(lock);
}
EXPORT_SYMBOL(_spin_lock_irqsave);
+#endif
+#ifndef _spin_lock_irq
void __lockfunc _spin_lock_irq(spinlock_t *lock)
{
- local_irq_disable();
- preempt_disable();
- _raw_spin_lock(lock);
+ __spin_lock_irq(lock);
}
EXPORT_SYMBOL(_spin_lock_irq);
+#endif
+#ifndef _spin_lock_bh
void __lockfunc _spin_lock_bh(spinlock_t *lock)
{
- local_bh_disable();
- preempt_disable();
- _raw_spin_lock(lock);
+ __spin_lock_bh(lock);
}
EXPORT_SYMBOL(_spin_lock_bh);
+#endif
+#ifndef _read_lock_irqsave
unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
{
- unsigned long flags;
-
- local_irq_save(flags);
- preempt_disable();
- _raw_read_lock(lock);
- return flags;
+ return __read_lock_irqsave(lock);
}
EXPORT_SYMBOL(_read_lock_irqsave);
+#endif
+#ifndef _read_lock_irq
void __lockfunc _read_lock_irq(rwlock_t *lock)
{
- local_irq_disable();
- preempt_disable();
- _raw_read_lock(lock);
+ __read_lock_irq(lock);
}
EXPORT_SYMBOL(_read_lock_irq);
+#endif
+#ifndef _read_lock_bh
void __lockfunc _read_lock_bh(rwlock_t *lock)
{
- local_bh_disable();
- preempt_disable();
- _raw_read_lock(lock);
+ __read_lock_bh(lock);
}
EXPORT_SYMBOL(_read_lock_bh);
+#endif
+#ifndef _write_lock_irqsave
unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
{
- unsigned long flags;
-
- local_irq_save(flags);
- preempt_disable();
- _raw_write_lock(lock);
- return flags;
+ return __write_lock_irqsave(lock);
}
EXPORT_SYMBOL(_write_lock_irqsave);
+#endif
+#ifndef _write_lock_irq
void __lockfunc _write_lock_irq(rwlock_t *lock)
{
- local_irq_disable();
- preempt_disable();
- _raw_write_lock(lock);
+ __write_lock_irq(lock);
}
EXPORT_SYMBOL(_write_lock_irq);
+#endif
+#ifndef _write_lock_bh
void __lockfunc _write_lock_bh(rwlock_t *lock)
{
- local_bh_disable();
- preempt_disable();
- _raw_write_lock(lock);
+ __write_lock_bh(lock);
}
EXPORT_SYMBOL(_write_lock_bh);
+#endif
+#ifndef _spin_lock
void __lockfunc _spin_lock(spinlock_t *lock)
{
- preempt_disable();
- _raw_spin_lock(lock);
+ __spin_lock(lock);
}
-
EXPORT_SYMBOL(_spin_lock);
+#endif
+#ifndef _write_lock
void __lockfunc _write_lock(rwlock_t *lock)
{
- preempt_disable();
- _raw_write_lock(lock);
+ __write_lock(lock);
}
-
EXPORT_SYMBOL(_write_lock);
+#endif
#else /* CONFIG_PREEMPT: */
#define BUILD_LOCK_OPS(op, locktype) \
void __lockfunc _##op##_lock(locktype##_t *lock) \
{ \
- preempt_disable(); \
for (;;) { \
+ preempt_disable(); \
if (likely(_raw_##op##_trylock(lock))) \
break; \
preempt_enable(); \
+ \
if (!(lock)->break_lock) \
(lock)->break_lock = 1; \
while (!op##_can_lock(lock) && (lock)->break_lock) \
- cpu_relax(); \
- preempt_disable(); \
+ _raw_##op##_relax(&lock->raw_lock); \
} \
(lock)->break_lock = 0; \
} \
{ \
unsigned long flags; \
\
- preempt_disable(); \
for (;;) { \
+ preempt_disable(); \
local_irq_save(flags); \
if (likely(_raw_##op##_trylock(lock))) \
break; \
local_irq_restore(flags); \
- \
preempt_enable(); \
+ \
if (!(lock)->break_lock) \
(lock)->break_lock = 1; \
while (!op##_can_lock(lock) && (lock)->break_lock) \
- cpu_relax(); \
- preempt_disable(); \
+ _raw_##op##_relax(&lock->raw_lock); \
} \
(lock)->break_lock = 0; \
return flags; \
#endif /* CONFIG_PREEMPT */
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+
+void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
+{
+ preempt_disable();
+ spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
+}
+EXPORT_SYMBOL(_spin_lock_nested);
+
+unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ preempt_disable();
+ spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+ LOCK_CONTENDED_FLAGS(lock, _raw_spin_trylock, _raw_spin_lock,
+ _raw_spin_lock_flags, &flags);
+ return flags;
+}
+EXPORT_SYMBOL(_spin_lock_irqsave_nested);
+
+void __lockfunc _spin_lock_nest_lock(spinlock_t *lock,
+ struct lockdep_map *nest_lock)
+{
+ preempt_disable();
+ spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
+ LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
+}
+EXPORT_SYMBOL(_spin_lock_nest_lock);
+
+#endif
+
+#ifndef _spin_unlock
void __lockfunc _spin_unlock(spinlock_t *lock)
{
- _raw_spin_unlock(lock);
- preempt_enable();
+ __spin_unlock(lock);
}
EXPORT_SYMBOL(_spin_unlock);
+#endif
+#ifndef _write_unlock
void __lockfunc _write_unlock(rwlock_t *lock)
{
- _raw_write_unlock(lock);
- preempt_enable();
+ __write_unlock(lock);
}
EXPORT_SYMBOL(_write_unlock);
+#endif
+#ifndef _read_unlock
void __lockfunc _read_unlock(rwlock_t *lock)
{
- _raw_read_unlock(lock);
- preempt_enable();
+ __read_unlock(lock);
}
EXPORT_SYMBOL(_read_unlock);
+#endif
+#ifndef _spin_unlock_irqrestore
void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
{
- _raw_spin_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
+ __spin_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(_spin_unlock_irqrestore);
+#endif
+#ifndef _spin_unlock_irq
void __lockfunc _spin_unlock_irq(spinlock_t *lock)
{
- _raw_spin_unlock(lock);
- local_irq_enable();
- preempt_enable();
+ __spin_unlock_irq(lock);
}
EXPORT_SYMBOL(_spin_unlock_irq);
+#endif
+#ifndef _spin_unlock_bh
void __lockfunc _spin_unlock_bh(spinlock_t *lock)
{
- _raw_spin_unlock(lock);
- preempt_enable();
- local_bh_enable();
+ __spin_unlock_bh(lock);
}
EXPORT_SYMBOL(_spin_unlock_bh);
+#endif
+#ifndef _read_unlock_irqrestore
void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
- _raw_read_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
+ __read_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(_read_unlock_irqrestore);
+#endif
+#ifndef _read_unlock_irq
void __lockfunc _read_unlock_irq(rwlock_t *lock)
{
- _raw_read_unlock(lock);
- local_irq_enable();
- preempt_enable();
+ __read_unlock_irq(lock);
}
EXPORT_SYMBOL(_read_unlock_irq);
+#endif
+#ifndef _read_unlock_bh
void __lockfunc _read_unlock_bh(rwlock_t *lock)
{
- _raw_read_unlock(lock);
- preempt_enable();
- local_bh_enable();
+ __read_unlock_bh(lock);
}
EXPORT_SYMBOL(_read_unlock_bh);
+#endif
+#ifndef _write_unlock_irqrestore
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
- _raw_write_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
+ __write_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(_write_unlock_irqrestore);
+#endif
+#ifndef _write_unlock_irq
void __lockfunc _write_unlock_irq(rwlock_t *lock)
{
- _raw_write_unlock(lock);
- local_irq_enable();
- preempt_enable();
+ __write_unlock_irq(lock);
}
EXPORT_SYMBOL(_write_unlock_irq);
+#endif
+#ifndef _write_unlock_bh
void __lockfunc _write_unlock_bh(rwlock_t *lock)
{
- _raw_write_unlock(lock);
- preempt_enable();
- local_bh_enable();
+ __write_unlock_bh(lock);
}
EXPORT_SYMBOL(_write_unlock_bh);
+#endif
+#ifndef _spin_trylock_bh
int __lockfunc _spin_trylock_bh(spinlock_t *lock)
{
- local_bh_disable();
- preempt_disable();
- if (_raw_spin_trylock(lock))
- return 1;
-
- preempt_enable();
- local_bh_enable();
- return 0;
+ return __spin_trylock_bh(lock);
}
EXPORT_SYMBOL(_spin_trylock_bh);
+#endif
-int in_lock_functions(unsigned long addr)
+notrace int in_lock_functions(unsigned long addr)
{
/* Linker adds these: start and end of __lockfunc functions */
extern char __lock_text_start[], __lock_text_end[];
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff