/* * 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> #ifndef _spin_trylock int __lockfunc _spin_trylock(spinlock_t *lock) { return __spin_trylock(lock); } EXPORT_SYMBOL(_spin_trylock); #endif #ifndef _read_trylock int __lockfunc _read_trylock(rwlock_t *lock) { return __read_trylock(lock); } EXPORT_SYMBOL(_read_trylock); #endif #ifndef _write_trylock int __lockfunc _write_trylock(rwlock_t *lock) { return __write_trylock(lock); } EXPORT_SYMBOL(_write_trylock); #endif /* * 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) { __read_lock(lock); } EXPORT_SYMBOL(_read_lock); #endif #ifndef _spin_lock_irqsave unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) { return __spin_lock_irqsave(lock); } EXPORT_SYMBOL(_spin_lock_irqsave); #endif #ifndef _spin_lock_irq void __lockfunc _spin_lock_irq(spinlock_t *lock) { __spin_lock_irq(lock); } EXPORT_SYMBOL(_spin_lock_irq); #endif #ifndef _spin_lock_bh void __lockfunc _spin_lock_bh(spinlock_t *lock) { __spin_lock_bh(lock); } EXPORT_SYMBOL(_spin_lock_bh); #endif #ifndef _read_lock_irqsave unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock) { return __read_lock_irqsave(lock); } EXPORT_SYMBOL(_read_lock_irqsave); #endif #ifndef _read_lock_irq void __lockfunc _read_lock_irq(rwlock_t *lock) { __read_lock_irq(lock); } EXPORT_SYMBOL(_read_lock_irq); #endif #ifndef _read_lock_bh void __lockfunc _read_lock_bh(rwlock_t *lock) { __read_lock_bh(lock); } EXPORT_SYMBOL(_read_lock_bh); #endif #ifndef _write_lock_irqsave unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock) { return __write_lock_irqsave(lock); } EXPORT_SYMBOL(_write_lock_irqsave); #endif #ifndef _write_lock_irq void __lockfunc _write_lock_irq(rwlock_t *lock) { __write_lock_irq(lock); } EXPORT_SYMBOL(_write_lock_irq); #endif #ifndef _write_lock_bh void __lockfunc _write_lock_bh(rwlock_t *lock) { __write_lock_bh(lock); } EXPORT_SYMBOL(_write_lock_bh); #endif #ifndef _spin_lock void __lockfunc _spin_lock(spinlock_t *lock) { __spin_lock(lock); } EXPORT_SYMBOL(_spin_lock); #endif #ifndef _write_lock void __lockfunc _write_lock(rwlock_t *lock) { __write_lock(lock); } EXPORT_SYMBOL(_write_lock); #endif #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 #ifndef _spin_unlock void __lockfunc _spin_unlock(spinlock_t *lock) { __spin_unlock(lock); } EXPORT_SYMBOL(_spin_unlock); #endif #ifndef _write_unlock void __lockfunc _write_unlock(rwlock_t *lock) { __write_unlock(lock); } EXPORT_SYMBOL(_write_unlock); #endif #ifndef _read_unlock void __lockfunc _read_unlock(rwlock_t *lock) { __read_unlock(lock); } EXPORT_SYMBOL(_read_unlock); #endif #ifndef _spin_unlock_irqrestore void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) { __spin_unlock_irqrestore(lock, flags); } EXPORT_SYMBOL(_spin_unlock_irqrestore); #endif #ifndef _spin_unlock_irq void __lockfunc _spin_unlock_irq(spinlock_t *lock) { __spin_unlock_irq(lock); } EXPORT_SYMBOL(_spin_unlock_irq); #endif #ifndef _spin_unlock_bh void __lockfunc _spin_unlock_bh(spinlock_t *lock) { __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) { __read_unlock_irqrestore(lock, flags); } EXPORT_SYMBOL(_read_unlock_irqrestore); #endif #ifndef _read_unlock_irq void __lockfunc _read_unlock_irq(rwlock_t *lock) { __read_unlock_irq(lock); } EXPORT_SYMBOL(_read_unlock_irq); #endif #ifndef _read_unlock_bh void __lockfunc _read_unlock_bh(rwlock_t *lock) { __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) { __write_unlock_irqrestore(lock, flags); } EXPORT_SYMBOL(_write_unlock_irqrestore); #endif #ifndef _write_unlock_irq void __lockfunc _write_unlock_irq(rwlock_t *lock) { __write_unlock_irq(lock); } EXPORT_SYMBOL(_write_unlock_irq); #endif #ifndef _write_unlock_bh void __lockfunc _write_unlock_bh(rwlock_t *lock) { __write_unlock_bh(lock); } EXPORT_SYMBOL(_write_unlock_bh); #endif #ifndef _spin_trylock_bh int __lockfunc _spin_trylock_bh(spinlock_t *lock) { return __spin_trylock_bh(lock); } EXPORT_SYMBOL(_spin_trylock_bh); #endif 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);