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/*

 * <asm/smplock.h>

 *

 * Default SMP lock implementation

 */

#include <linux/sched.h>

#include <linux/interrupt.h>

#include <linux/spinlock.h>

extern spinlock_t kernel_flag;

#define kernel_locked()         spin_is_locked(&kernel_flag)

/*

 * Release global kernel lock and global interrupt lock

 */

static __inline__ void release_kernel_lock(struct task_struct *task, int cpu)

{

        if (task->lock_depth >= 0)

                spin_unlock(&kernel_flag);

        release_irqlock(cpu);

        __sti();

}

/*

 * Re-acquire the kernel lock

 */

static __inline__ void reacquire_kernel_lock(struct task_struct *task)

{

        if (task->lock_depth >= 0)

                spin_lock(&kernel_flag);

}

/*

 * Getting the big kernel lock.

 *

 * This cannot happen asynchronously,

 * so we only need to worry about other

 * CPU's.

 */

static __inline__ void lock_kernel(void)

{

        if (!++current->lock_depth)

                spin_lock(&kernel_flag);

}

static __inline__ void unlock_kernel(void)

{

        if (--current->lock_depth < 0)

                spin_unlock(&kernel_flag);

}