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/*

 * <asm/smplock.h>

 *

 * Default SMP lock implementation

 */

#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

 */

#define release_kernel_lock(task, cpu) \

do { \

        if (task->lock_depth >= 0) \

                spin_unlock(&kernel_flag); \

        release_irqlock(cpu); \

        __sti(); \

} while (0)

/*

 * Re-acquire the kernel lock

 */

#define reacquire_kernel_lock(task) \

do { \

        if (task->lock_depth >= 0) \

                spin_lock(&kernel_flag); \

} while (0)

/*

 * Getting the big kernel lock.

 *

 * This cannot happen asynchronously,

 * so we only need to worry about other

 * CPU's.

 */

extern __inline__ void lock_kernel(void)

{

        if (!++current->lock_depth)

                spin_lock(&kernel_flag);

}

extern __inline__ void unlock_kernel(void)

{

        if (--current->lock_depth < 0)

                spin_unlock(&kernel_flag);

}