summaryrefslogblamecommitdiff
path: root/include/linux/spinlock_api_smp.h
blob: 19a9be9d97ee531f236be5f1953ac80ce729238b (plain) (tree)


















                                                      
                                                                      
 


                                                                                 
               







                                                                                 
                        






                                                                                 
               

                                                                                 
 
                              
                                                  

      
                                 
                                                        

      
                                  
                                                          

      
                                      
                                                                  

      
                                 
                                                        

      
                                    
                                                              

      
                                   
                                                      

      
                                   
                                                            

      
                                    
                                                              

      
                                           
                                                                                          

      
                                                          

                          
                                        






                                                             

                                                                
                                                                         



                                                                          
                                                                         







                                                               
                                                                 


                                                                  
                                                                    
     
                                             



                     
                                                            



                                                     
                                                                    

 
                                                           
 
                                                             
                                                     
                                                                    

 
                                                        


                                                     
                                                                    

 
                                                                 
 
                                                          
 
                                               
                                 


                         
                                                                     

                                                                
                                               
                                 



                                 
                                                              
 
                                               
                                 



                           
                                                             
 
                                               
                                 
                                                            

 
                                                             
 
                                                             
                                        


                                                             
                                                            


                 

                                 
                                       
#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_PREEMPTION, 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, _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, _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, _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, _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 */