[linux-2.6-block.git] / include / linux / smp_lock.h

#ifndef __LINUX_SMPLOCK_H
#define __LINUX_SMPLOCK_H

#ifdef CONFIG_LOCK_KERNEL
#include <linux/sched.h>

#define kernel_locked()		(current->lock_depth >= 0)

extern int __lockfunc __reacquire_kernel_lock(void);
extern void __lockfunc __release_kernel_lock(void);

/*
 * Release/re-acquire global kernel lock for the scheduler
 */
#define release_kernel_lock(tsk) do { 		\
	if (unlikely((tsk)->lock_depth >= 0))	\
		__release_kernel_lock();	\
} while (0)

static inline int reacquire_kernel_lock(struct task_struct *task)
{
	if (unlikely(task->lock_depth >= 0))
		return __reacquire_kernel_lock();
	return 0;
}

extern void __lockfunc lock_kernel(void)	__acquires(kernel_lock);
extern void __lockfunc unlock_kernel(void)	__releases(kernel_lock);

#else

#define lock_kernel()				do { } while(0)
#define unlock_kernel()				do { } while(0)
#define release_kernel_lock(task)		do { } while(0)
#define reacquire_kernel_lock(task)		0
#define kernel_locked()				1

#endif /* CONFIG_LOCK_KERNEL */
#endif /* __LINUX_SMPLOCK_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_SMPLOCK_H
	2	#define __LINUX_SMPLOCK_H
	3
f037360f	4	#ifdef CONFIG_LOCK_KERNEL
1da177e4	5	#include <linux/sched.h>
1da177e4	6
1da177e4 LT	7	#define kernel_locked() (current->lock_depth >= 0)
	8
	9	extern int __lockfunc __reacquire_kernel_lock(void);
	10	extern void __lockfunc __release_kernel_lock(void);
	11
	12	/*
	13	* Release/re-acquire global kernel lock for the scheduler
	14	*/
	15	#define release_kernel_lock(tsk) do { \
	16	if (unlikely((tsk)->lock_depth >= 0)) \
	17	__release_kernel_lock(); \
	18	} while (0)
	19
1da177e4 LT	20	static inline int reacquire_kernel_lock(struct task_struct *task)
	21	{
	22	if (unlikely(task->lock_depth >= 0))
6478d880	23	return __reacquire_kernel_lock();
1da177e4 LT	24	return 0;
	25	}
	26
	27	extern void __lockfunc lock_kernel(void) __acquires(kernel_lock);
	28	extern void __lockfunc unlock_kernel(void) __releases(kernel_lock);
	29
	30	#else
	31
	32	#define lock_kernel() do { } while(0)
	33	#define unlock_kernel() do { } while(0)
	34	#define release_kernel_lock(task) do { } while(0)
	35	#define reacquire_kernel_lock(task) 0
	36	#define kernel_locked() 1
	37
	38	#endif /* CONFIG_LOCK_KERNEL */
	39	#endif /* __LINUX_SMPLOCK_H */