root/include/linux/spinlock_api_smp.h

INCLUDED FROM

DEFINITIONS

1. _raw_spin_lock
2. __raw_spin_lock_irqsave
3. __raw_spin_lock_irq
4. __raw_spin_lock_bh
5. __raw_spin_lock
6. __raw_spin_unlock
7. __raw_spin_unlock_irqrestore
8. __raw_spin_unlock_irq
9. __raw_spin_unlock_bh
10. __raw_spin_trylock_bh

#ifndef __LINUX_SPINLOCK_API_SMP_H
#define __LINUX_SPINLOCK_API_SMP_H

#ifndef __LINUX_SPINLOCK_H
# error "please don't include this file directly"
#endif

/*
 * include/linux/spinlock_api_smp.h
 *
 * spinlock API declarations on SMP (and debug)
 * (implemented in kernel/spinlock.c)
 *
 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
 * Released under the General Public License (GPL).
 */

int in_lock_functions(unsigned long addr);

#define assert_raw_spin_locked(x)       BUG_ON(!raw_spin_is_locked(x))

void __lockfunc _raw_spin_lock(raw_spinlock_t *lock)            __acquires(lock);
void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
                                                                __acquires(lock);
void __lockfunc
_raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
                                                                __acquires(lock);
void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)         __acquires(lock);
void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
                                                                __acquires(lock);

unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
                                                                __acquires(lock);
unsigned long __lockfunc
_raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
                                                                __acquires(lock);
int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)          __releases(lock);
void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)       __releases(lock);
void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)      __releases(lock);
void __lockfunc
_raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
                                                                __releases(lock);

#ifdef CONFIG_INLINE_SPIN_LOCK
#define _raw_spin_lock(lock) __raw_spin_lock(lock)
#endif

#ifdef CONFIG_INLINE_SPIN_LOCK_BH
#define _raw_spin_lock_bh(lock) __raw_spin_lock_bh(lock)
#endif

#ifdef CONFIG_INLINE_SPIN_LOCK_IRQ
#define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock)
#endif

#ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
#define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock)
#endif

#ifdef CONFIG_INLINE_SPIN_TRYLOCK
#define _raw_spin_trylock(lock) __raw_spin_trylock(lock)
#endif

#ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH
#define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock)
#endif

#ifndef CONFIG_UNINLINE_SPIN_UNLOCK
#define _raw_spin_unlock(lock) __raw_spin_unlock(lock)
#endif

#ifdef CONFIG_INLINE_SPIN_UNLOCK_BH
#define _raw_spin_unlock_bh(lock) __raw_spin_unlock_bh(lock)
#endif

#ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ
#define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock)
#endif

#ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
#define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrestore(lock, flags)
#endif

static inline int __raw_spin_trylock(raw_spinlock_t *lock)
{
        preempt_disable();
        if (do_raw_spin_trylock(lock)) {
                spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
                return 1;
        }
        preempt_enable();
        return 0;
}

/*
 * 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)

static inline unsigned long __raw_spin_lock_irqsave(raw_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
         * do_raw_spin_lock_flags() code, because lockdep assumes
         * that interrupts are not re-enabled during lock-acquire:
         */
#ifdef CONFIG_LOCKDEP
        LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
#else
        do_raw_spin_lock_flags(lock, &flags);
#endif
        return flags;
}

static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
{
        local_irq_disable();
        preempt_disable();
        spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
        LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
}

static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
{
        __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
        spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
        LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
}

static inline void __raw_spin_lock(raw_spinlock_t *lock)
{
        preempt_disable();
        spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
        LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
}

#endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */

static inline void __raw_spin_unlock(raw_spinlock_t *lock)
{
        spin_release(&lock->dep_map, 1, _RET_IP_);
        do_raw_spin_unlock(lock);
        preempt_enable();
}

static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
                                            unsigned long flags)
{
        spin_release(&lock->dep_map, 1, _RET_IP_);
        do_raw_spin_unlock(lock);
        local_irq_restore(flags);
        preempt_enable();
}

static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
{
        spin_release(&lock->dep_map, 1, _RET_IP_);
        do_raw_spin_unlock(lock);
        local_irq_enable();
        preempt_enable();
}

static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
{
        spin_release(&lock->dep_map, 1, _RET_IP_);
        do_raw_spin_unlock(lock);
        __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
}

static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
{
        __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
        if (do_raw_spin_trylock(lock)) {
                spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
                return 1;
        }
        __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
        return 0;
}

#include <linux/rwlock_api_smp.h>

#endif /* __LINUX_SPINLOCK_API_SMP_H */