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- /*
- * Copyright (2004) Linus Torvalds
- *
- * Author: Zwane Mwaikambo <zwane@fsmlabs.com>
- *
- * 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/linkage.h>
- #include <linux/preempt.h>
- #include <linux/spinlock.h>
- #include <linux/interrupt.h>
- #include <linux/debug_locks.h>
- #include <linux/module.h>
- int __lockfunc _spin_trylock(spinlock_t *lock)
- {
- preempt_disable();
- if (_raw_spin_trylock(lock)) {
- spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
- return 1;
- }
-
- preempt_enable();
- return 0;
- }
- EXPORT_SYMBOL(_spin_trylock);
- int __lockfunc _read_trylock(rwlock_t *lock)
- {
- preempt_disable();
- if (_raw_read_trylock(lock)) {
- rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
- return 1;
- }
- preempt_enable();
- return 0;
- }
- EXPORT_SYMBOL(_read_trylock);
- int __lockfunc _write_trylock(rwlock_t *lock)
- {
- preempt_disable();
- if (_raw_write_trylock(lock)) {
- rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
- return 1;
- }
- preempt_enable();
- return 0;
- }
- EXPORT_SYMBOL(_write_trylock);
- /*
- * 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)
- void __lockfunc _read_lock(rwlock_t *lock)
- {
- preempt_disable();
- rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
- }
- EXPORT_SYMBOL(_read_lock);
- unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
- {
- unsigned long flags;
- local_irq_save(flags);
- preempt_disable();
- spin_acquire(&lock->dep_map, 0, 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
- return flags;
- }
- EXPORT_SYMBOL(_spin_lock_irqsave);
- void __lockfunc _spin_lock_irq(spinlock_t *lock)
- {
- local_irq_disable();
- preempt_disable();
- spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
- }
- EXPORT_SYMBOL(_spin_lock_irq);
- void __lockfunc _spin_lock_bh(spinlock_t *lock)
- {
- local_bh_disable();
- preempt_disable();
- spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
- }
- EXPORT_SYMBOL(_spin_lock_bh);
- unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
- {
- unsigned long flags;
- local_irq_save(flags);
- preempt_disable();
- rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
- _raw_read_lock_flags, &flags);
- return flags;
- }
- EXPORT_SYMBOL(_read_lock_irqsave);
- void __lockfunc _read_lock_irq(rwlock_t *lock)
- {
- local_irq_disable();
- preempt_disable();
- rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
- }
- EXPORT_SYMBOL(_read_lock_irq);
- void __lockfunc _read_lock_bh(rwlock_t *lock)
- {
- local_bh_disable();
- preempt_disable();
- rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
- }
- EXPORT_SYMBOL(_read_lock_bh);
- unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
- {
- unsigned long flags;
- local_irq_save(flags);
- preempt_disable();
- rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
- _raw_write_lock_flags, &flags);
- return flags;
- }
- EXPORT_SYMBOL(_write_lock_irqsave);
- void __lockfunc _write_lock_irq(rwlock_t *lock)
- {
- local_irq_disable();
- preempt_disable();
- rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
- }
- EXPORT_SYMBOL(_write_lock_irq);
- void __lockfunc _write_lock_bh(rwlock_t *lock)
- {
- local_bh_disable();
- preempt_disable();
- rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
- }
- EXPORT_SYMBOL(_write_lock_bh);
- void __lockfunc _spin_lock(spinlock_t *lock)
- {
- preempt_disable();
- spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
- }
- EXPORT_SYMBOL(_spin_lock);
- void __lockfunc _write_lock(rwlock_t *lock)
- {
- preempt_disable();
- rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
- LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
- }
- EXPORT_SYMBOL(_write_lock);
- #else /* CONFIG_PREEMPT: */
- /*
- * 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) \
- { \
- 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) \
- _raw_##op##_relax(&lock->raw_lock); \
- } \
- (lock)->break_lock = 0; \
- } \
- \
- EXPORT_SYMBOL(_##op##_lock); \
- \
- unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \
- { \
- unsigned long flags; \
- \
- 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) \
- _raw_##op##_relax(&lock->raw_lock); \
- } \
- (lock)->break_lock = 0; \
- return flags; \
- } \
- \
- EXPORT_SYMBOL(_##op##_lock_irqsave); \
- \
- void __lockfunc _##op##_lock_irq(locktype##_t *lock) \
- { \
- _##op##_lock_irqsave(lock); \
- } \
- \
- EXPORT_SYMBOL(_##op##_lock_irq); \
- \
- void __lockfunc _##op##_lock_bh(locktype##_t *lock) \
- { \
- unsigned long flags; \
- \
- /* */ \
- /* Careful: we must exclude softirqs too, hence the */ \
- /* irq-disabling. We use the generic preemption-aware */ \
- /* function: */ \
- /**/ \
- flags = _##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()
- */
- BUILD_LOCK_OPS(spin, spinlock);
- BUILD_LOCK_OPS(read, rwlock);
- BUILD_LOCK_OPS(write, rwlock);
- #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
- void __lockfunc _spin_unlock(spinlock_t *lock)
- {
- spin_release(&lock->dep_map, 1, _RET_IP_);
- _raw_spin_unlock(lock);
- preempt_enable();
- }
- EXPORT_SYMBOL(_spin_unlock);
- void __lockfunc _write_unlock(rwlock_t *lock)
- {
- rwlock_release(&lock->dep_map, 1, _RET_IP_);
- _raw_write_unlock(lock);
- preempt_enable();
- }
- EXPORT_SYMBOL(_write_unlock);
- void __lockfunc _read_unlock(rwlock_t *lock)
- {
- rwlock_release(&lock->dep_map, 1, _RET_IP_);
- _raw_read_unlock(lock);
- preempt_enable();
- }
- EXPORT_SYMBOL(_read_unlock);
- void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
- {
- spin_release(&lock->dep_map, 1, _RET_IP_);
- _raw_spin_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
- }
- EXPORT_SYMBOL(_spin_unlock_irqrestore);
- void __lockfunc _spin_unlock_irq(spinlock_t *lock)
- {
- spin_release(&lock->dep_map, 1, _RET_IP_);
- _raw_spin_unlock(lock);
- local_irq_enable();
- preempt_enable();
- }
- EXPORT_SYMBOL(_spin_unlock_irq);
- void __lockfunc _spin_unlock_bh(spinlock_t *lock)
- {
- spin_release(&lock->dep_map, 1, _RET_IP_);
- _raw_spin_unlock(lock);
- preempt_enable_no_resched();
- local_bh_enable_ip((unsigned long)__builtin_return_address(0));
- }
- EXPORT_SYMBOL(_spin_unlock_bh);
- void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
- {
- rwlock_release(&lock->dep_map, 1, _RET_IP_);
- _raw_read_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
- }
- EXPORT_SYMBOL(_read_unlock_irqrestore);
- void __lockfunc _read_unlock_irq(rwlock_t *lock)
- {
- rwlock_release(&lock->dep_map, 1, _RET_IP_);
- _raw_read_unlock(lock);
- local_irq_enable();
- preempt_enable();
- }
- EXPORT_SYMBOL(_read_unlock_irq);
- void __lockfunc _read_unlock_bh(rwlock_t *lock)
- {
- rwlock_release(&lock->dep_map, 1, _RET_IP_);
- _raw_read_unlock(lock);
- preempt_enable_no_resched();
- local_bh_enable_ip((unsigned long)__builtin_return_address(0));
- }
- EXPORT_SYMBOL(_read_unlock_bh);
- void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
- {
- rwlock_release(&lock->dep_map, 1, _RET_IP_);
- _raw_write_unlock(lock);
- local_irq_restore(flags);
- preempt_enable();
- }
- EXPORT_SYMBOL(_write_unlock_irqrestore);
- void __lockfunc _write_unlock_irq(rwlock_t *lock)
- {
- rwlock_release(&lock->dep_map, 1, _RET_IP_);
- _raw_write_unlock(lock);
- local_irq_enable();
- preempt_enable();
- }
- EXPORT_SYMBOL(_write_unlock_irq);
- void __lockfunc _write_unlock_bh(rwlock_t *lock)
- {
- rwlock_release(&lock->dep_map, 1, _RET_IP_);
- _raw_write_unlock(lock);
- preempt_enable_no_resched();
- local_bh_enable_ip((unsigned long)__builtin_return_address(0));
- }
- EXPORT_SYMBOL(_write_unlock_bh);
- int __lockfunc _spin_trylock_bh(spinlock_t *lock)
- {
- local_bh_disable();
- preempt_disable();
- if (_raw_spin_trylock(lock)) {
- spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
- return 1;
- }
- preempt_enable_no_resched();
- local_bh_enable_ip((unsigned long)__builtin_return_address(0));
- return 0;
- }
- EXPORT_SYMBOL(_spin_trylock_bh);
- 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[];
- return addr >= (unsigned long)__lock_text_start
- && addr < (unsigned long)__lock_text_end;
- }
- EXPORT_SYMBOL(in_lock_functions);
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