*
* 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:
+ * 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):
*/
-int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock)
-{
- __raw_read_lock(lock);
- return 1;
-}
-EXPORT_SYMBOL(generic__raw_read_trylock);
-
-int __lockfunc _spin_trylock(spinlock_t *lock)
-{
- preempt_disable();
- if (_raw_spin_trylock(lock))
- return 1;
-
- preempt_enable();
- return 0;
-}
-EXPORT_SYMBOL(_spin_trylock);
-
-int __lockfunc _read_trylock(rwlock_t *lock)
-{
- preempt_disable();
- if (_raw_read_trylock(lock))
- return 1;
-
- preempt_enable();
- return 0;
-}
-EXPORT_SYMBOL(_read_trylock);
-
-int __lockfunc _write_trylock(rwlock_t *lock)
-{
- preempt_disable();
- if (_raw_write_trylock(lock))
- return 1;
-
- preempt_enable();
- return 0;
-}
-EXPORT_SYMBOL(_write_trylock);
-
-#if !defined(CONFIG_PREEMPT) || !defined(CONFIG_SMP)
-
-void __lockfunc _read_lock(rwlock_t *lock)
-{
- preempt_disable();
- _raw_read_lock(lock);
-}
-EXPORT_SYMBOL(_read_lock);
-
-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;
-}
-EXPORT_SYMBOL(_spin_lock_irqsave);
-
-void __lockfunc _spin_lock_irq(spinlock_t *lock)
-{
- local_irq_disable();
- preempt_disable();
- _raw_spin_lock(lock);
-}
-EXPORT_SYMBOL(_spin_lock_irq);
-
-void __lockfunc _spin_lock_bh(spinlock_t *lock)
-{
- local_bh_disable();
- preempt_disable();
- _raw_spin_lock(lock);
-}
-EXPORT_SYMBOL(_spin_lock_bh);
-
-unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- preempt_disable();
- _raw_read_lock(lock);
- return flags;
-}
-EXPORT_SYMBOL(_read_lock_irqsave);
-
-void __lockfunc _read_lock_irq(rwlock_t *lock)
-{
- local_irq_disable();
- preempt_disable();
- _raw_read_lock(lock);
-}
-EXPORT_SYMBOL(_read_lock_irq);
-
-void __lockfunc _read_lock_bh(rwlock_t *lock)
-{
- local_bh_disable();
- preempt_disable();
- _raw_read_lock(lock);
-}
-EXPORT_SYMBOL(_read_lock_bh);
-
-unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- preempt_disable();
- _raw_write_lock(lock);
- return flags;
-}
-EXPORT_SYMBOL(_write_lock_irqsave);
-
-void __lockfunc _write_lock_irq(rwlock_t *lock)
-{
- local_irq_disable();
- preempt_disable();
- _raw_write_lock(lock);
-}
-EXPORT_SYMBOL(_write_lock_irq);
-
-void __lockfunc _write_lock_bh(rwlock_t *lock)
-{
- local_bh_disable();
- preempt_disable();
- _raw_write_lock(lock);
-}
-EXPORT_SYMBOL(_write_lock_bh);
-
-void __lockfunc _spin_lock(spinlock_t *lock)
-{
- preempt_disable();
- _raw_spin_lock(lock);
-}
-
-EXPORT_SYMBOL(_spin_lock);
-
-void __lockfunc _write_lock(rwlock_t *lock)
-{
- preempt_disable();
- _raw_write_lock(lock);
-}
-
-EXPORT_SYMBOL(_write_lock);
-
-#else /* CONFIG_PREEMPT: */
-
+#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
+/*
+ * The __lock_function inlines are taken from
+ * include/linux/spinlock_api_smp.h
+ */
+#else
+#define raw_read_can_lock(l) read_can_lock(l)
+#define raw_write_can_lock(l) write_can_lock(l)
/*
+ * We build the __lock_function inlines here. They are too large for
+ * inlining all over the place, but here is only one user per function
+ * which embedds them into the calling _lock_function below.
+ *
* This could be a long-held lock. We both prepare to spin for a long
* time (making _this_ CPU preemptable if possible), and we also signal
* towards that other CPU that it should break the lock ASAP.
- *
- * (We do this in a function because inlining it would be excessive.)
*/
-
#define BUILD_LOCK_OPS(op, locktype) \
-void __lockfunc _##op##_lock(locktype##_t *lock) \
+void __lockfunc __raw_##op##_lock(locktype##_t *lock) \
{ \
for (;;) { \
preempt_disable(); \
- if (likely(_raw_##op##_trylock(lock))) \
+ if (likely(do_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(); \
+ while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
+ arch_##op##_relax(&lock->raw_lock); \
} \
(lock)->break_lock = 0; \
} \
\
-EXPORT_SYMBOL(_##op##_lock); \
- \
-unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \
+unsigned long __lockfunc __raw_##op##_lock_irqsave(locktype##_t *lock) \
{ \
unsigned long flags; \
\
for (;;) { \
preempt_disable(); \
local_irq_save(flags); \
- if (likely(_raw_##op##_trylock(lock))) \
+ if (likely(do_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(); \
+ while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
+ arch_##op##_relax(&lock->raw_lock); \
} \
(lock)->break_lock = 0; \
return flags; \
} \
\
-EXPORT_SYMBOL(_##op##_lock_irqsave); \
- \
-void __lockfunc _##op##_lock_irq(locktype##_t *lock) \
+void __lockfunc __raw_##op##_lock_irq(locktype##_t *lock) \
{ \
- _##op##_lock_irqsave(lock); \
+ _raw_##op##_lock_irqsave(lock); \
} \
\
-EXPORT_SYMBOL(_##op##_lock_irq); \
- \
-void __lockfunc _##op##_lock_bh(locktype##_t *lock) \
+void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock) \
{ \
unsigned long flags; \
\
/* irq-disabling. We use the generic preemption-aware */ \
/* function: */ \
/**/ \
- flags = _##op##_lock_irqsave(lock); \
+ flags = _raw_##op##_lock_irqsave(lock); \
local_bh_disable(); \
local_irq_restore(flags); \
} \
- \
-EXPORT_SYMBOL(_##op##_lock_bh)
/*
* Build preemption-friendly versions of the following
* lock-spinning functions:
*
- * _[spin|read|write]_lock()
- * _[spin|read|write]_lock_irq()
- * _[spin|read|write]_lock_irqsave()
- * _[spin|read|write]_lock_bh()
+ * __[spin|read|write]_lock()
+ * __[spin|read|write]_lock_irq()
+ * __[spin|read|write]_lock_irqsave()
+ * __[spin|read|write]_lock_bh()
*/
-BUILD_LOCK_OPS(spin, spinlock);
+BUILD_LOCK_OPS(spin, raw_spinlock);
BUILD_LOCK_OPS(read, rwlock);
BUILD_LOCK_OPS(write, rwlock);
-#endif /* CONFIG_PREEMPT */
+#endif
-void __lockfunc _spin_unlock(spinlock_t *lock)
+#ifndef CONFIG_INLINE_SPIN_TRYLOCK
+int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock)
{
- _raw_spin_unlock(lock);
- preempt_enable();
+ return __raw_spin_trylock(lock);
}
-EXPORT_SYMBOL(_spin_unlock);
+EXPORT_SYMBOL(_raw_spin_trylock);
+#endif
-void __lockfunc _write_unlock(rwlock_t *lock)
+#ifndef CONFIG_INLINE_SPIN_TRYLOCK_BH
+int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock)
{
- _raw_write_unlock(lock);
- preempt_enable();
+ return __raw_spin_trylock_bh(lock);
}
-EXPORT_SYMBOL(_write_unlock);
+EXPORT_SYMBOL(_raw_spin_trylock_bh);
+#endif
-void __lockfunc _read_unlock(rwlock_t *lock)
+#ifndef CONFIG_INLINE_SPIN_LOCK
+void __lockfunc _raw_spin_lock(raw_spinlock_t *lock)
{
- _raw_read_unlock(lock);
- preempt_enable();
+ __raw_spin_lock(lock);
}
-EXPORT_SYMBOL(_read_unlock);
+EXPORT_SYMBOL(_raw_spin_lock);
+#endif
-void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
+#ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
+unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
{
- _raw_spin_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
+ return __raw_spin_lock_irqsave(lock);
}
-EXPORT_SYMBOL(_spin_unlock_irqrestore);
+EXPORT_SYMBOL(_raw_spin_lock_irqsave);
+#endif
-void __lockfunc _spin_unlock_irq(spinlock_t *lock)
+#ifndef CONFIG_INLINE_SPIN_LOCK_IRQ
+void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
{
- _raw_spin_unlock(lock);
- local_irq_enable();
- preempt_enable();
+ __raw_spin_lock_irq(lock);
}
-EXPORT_SYMBOL(_spin_unlock_irq);
+EXPORT_SYMBOL(_raw_spin_lock_irq);
+#endif
-void __lockfunc _spin_unlock_bh(spinlock_t *lock)
+#ifndef CONFIG_INLINE_SPIN_LOCK_BH
+void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)
{
- _raw_spin_unlock(lock);
- preempt_enable_no_resched();
- local_bh_enable();
+ __raw_spin_lock_bh(lock);
}
-EXPORT_SYMBOL(_spin_unlock_bh);
+EXPORT_SYMBOL(_raw_spin_lock_bh);
+#endif
-void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+#ifndef CONFIG_INLINE_SPIN_UNLOCK
+void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)
{
- _raw_read_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
+ __raw_spin_unlock(lock);
}
-EXPORT_SYMBOL(_read_unlock_irqrestore);
+EXPORT_SYMBOL(_raw_spin_unlock);
+#endif
-void __lockfunc _read_unlock_irq(rwlock_t *lock)
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
+void __lockfunc _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
{
- _raw_read_unlock(lock);
- local_irq_enable();
- preempt_enable();
+ __raw_spin_unlock_irqrestore(lock, flags);
}
-EXPORT_SYMBOL(_read_unlock_irq);
+EXPORT_SYMBOL(_raw_spin_unlock_irqrestore);
+#endif
-void __lockfunc _read_unlock_bh(rwlock_t *lock)
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ
+void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)
{
- _raw_read_unlock(lock);
- preempt_enable_no_resched();
- local_bh_enable();
+ __raw_spin_unlock_irq(lock);
}
-EXPORT_SYMBOL(_read_unlock_bh);
+EXPORT_SYMBOL(_raw_spin_unlock_irq);
+#endif
-void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+#ifndef CONFIG_INLINE_SPIN_UNLOCK_BH
+void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)
{
- _raw_write_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
+ __raw_spin_unlock_bh(lock);
}
-EXPORT_SYMBOL(_write_unlock_irqrestore);
+EXPORT_SYMBOL(_raw_spin_unlock_bh);
+#endif
-void __lockfunc _write_unlock_irq(rwlock_t *lock)
+#ifndef CONFIG_INLINE_READ_TRYLOCK
+int __lockfunc _raw_read_trylock(rwlock_t *lock)
{
- _raw_write_unlock(lock);
- local_irq_enable();
- preempt_enable();
+ return __raw_read_trylock(lock);
}
-EXPORT_SYMBOL(_write_unlock_irq);
+EXPORT_SYMBOL(_raw_read_trylock);
+#endif
-void __lockfunc _write_unlock_bh(rwlock_t *lock)
+#ifndef CONFIG_INLINE_READ_LOCK
+void __lockfunc _raw_read_lock(rwlock_t *lock)
{
- _raw_write_unlock(lock);
- preempt_enable_no_resched();
- local_bh_enable();
+ __raw_read_lock(lock);
}
-EXPORT_SYMBOL(_write_unlock_bh);
+EXPORT_SYMBOL(_raw_read_lock);
+#endif
-int __lockfunc _spin_trylock_bh(spinlock_t *lock)
+#ifndef CONFIG_INLINE_READ_LOCK_IRQSAVE
+unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
+{
+ return __raw_read_lock_irqsave(lock);
+}
+EXPORT_SYMBOL(_raw_read_lock_irqsave);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK_IRQ
+void __lockfunc _raw_read_lock_irq(rwlock_t *lock)
+{
+ __raw_read_lock_irq(lock);
+}
+EXPORT_SYMBOL(_raw_read_lock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_READ_LOCK_BH
+void __lockfunc _raw_read_lock_bh(rwlock_t *lock)
+{
+ __raw_read_lock_bh(lock);
+}
+EXPORT_SYMBOL(_raw_read_lock_bh);
+#endif
+
+#ifndef CONFIG_INLINE_READ_UNLOCK
+void __lockfunc _raw_read_unlock(rwlock_t *lock)
+{
+ __raw_read_unlock(lock);
+}
+EXPORT_SYMBOL(_raw_read_unlock);
+#endif
+
+#ifndef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
+void __lockfunc _raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+{
+ __raw_read_unlock_irqrestore(lock, flags);
+}
+EXPORT_SYMBOL(_raw_read_unlock_irqrestore);
+#endif
+
+#ifndef CONFIG_INLINE_READ_UNLOCK_IRQ
+void __lockfunc _raw_read_unlock_irq(rwlock_t *lock)
+{
+ __raw_read_unlock_irq(lock);
+}
+EXPORT_SYMBOL(_raw_read_unlock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_READ_UNLOCK_BH
+void __lockfunc _raw_read_unlock_bh(rwlock_t *lock)
+{
+ __raw_read_unlock_bh(lock);
+}
+EXPORT_SYMBOL(_raw_read_unlock_bh);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_TRYLOCK
+int __lockfunc _raw_write_trylock(rwlock_t *lock)
+{
+ return __raw_write_trylock(lock);
+}
+EXPORT_SYMBOL(_raw_write_trylock);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK
+void __lockfunc _raw_write_lock(rwlock_t *lock)
+{
+ __raw_write_lock(lock);
+}
+EXPORT_SYMBOL(_raw_write_lock);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
+unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
+{
+ return __raw_write_lock_irqsave(lock);
+}
+EXPORT_SYMBOL(_raw_write_lock_irqsave);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK_IRQ
+void __lockfunc _raw_write_lock_irq(rwlock_t *lock)
+{
+ __raw_write_lock_irq(lock);
+}
+EXPORT_SYMBOL(_raw_write_lock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_LOCK_BH
+void __lockfunc _raw_write_lock_bh(rwlock_t *lock)
+{
+ __raw_write_lock_bh(lock);
+}
+EXPORT_SYMBOL(_raw_write_lock_bh);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_UNLOCK
+void __lockfunc _raw_write_unlock(rwlock_t *lock)
+{
+ __raw_write_unlock(lock);
+}
+EXPORT_SYMBOL(_raw_write_unlock);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
+void __lockfunc _raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+{
+ __raw_write_unlock_irqrestore(lock, flags);
+}
+EXPORT_SYMBOL(_raw_write_unlock_irqrestore);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQ
+void __lockfunc _raw_write_unlock_irq(rwlock_t *lock)
+{
+ __raw_write_unlock_irq(lock);
+}
+EXPORT_SYMBOL(_raw_write_unlock_irq);
+#endif
+
+#ifndef CONFIG_INLINE_WRITE_UNLOCK_BH
+void __lockfunc _raw_write_unlock_bh(rwlock_t *lock)
+{
+ __raw_write_unlock_bh(lock);
+}
+EXPORT_SYMBOL(_raw_write_unlock_bh);
+#endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+
+void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
{
- local_bh_disable();
preempt_disable();
- if (_raw_spin_trylock(lock))
- return 1;
+ spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
+}
+EXPORT_SYMBOL(_raw_spin_lock_nested);
- preempt_enable_no_resched();
- local_bh_enable();
- return 0;
+unsigned long __lockfunc _raw_spin_lock_irqsave_nested(raw_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, do_raw_spin_trylock, do_raw_spin_lock,
+ do_raw_spin_lock_flags, &flags);
+ return flags;
}
-EXPORT_SYMBOL(_spin_trylock_bh);
+EXPORT_SYMBOL(_raw_spin_lock_irqsave_nested);
+
+void __lockfunc _raw_spin_lock_nest_lock(raw_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, do_raw_spin_trylock, do_raw_spin_lock);
+}
+EXPORT_SYMBOL(_raw_spin_lock_nest_lock);
+
+#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