4 * Default SMP lock implementation
9 #include <linux/sched.h>
10 #include <linux/interrupt.h>
11 #include <linux/spinlock.h>
13 extern spinlock_t kernel_flag
;
15 #define kernel_locked() spin_is_locked(&kernel_flag)
18 * Release global kernel lock and global interrupt lock
20 static __inline__
void release_kernel_lock(struct task_struct
*task
, int cpu
)
22 if (task
->lock_depth
>= 0)
23 spin_unlock(&kernel_flag
);
29 * Re-acquire the kernel lock
31 static __inline__
void reacquire_kernel_lock(struct task_struct
*task
)
33 if (task
->lock_depth
>= 0)
34 spin_lock(&kernel_flag
);
38 * Getting the big kernel lock.
40 * This cannot happen asynchronously,
41 * so we only need to worry about other
44 static __inline__
void lock_kernel(void)
46 if (!++current
->lock_depth
)
47 spin_lock(&kernel_flag
);
50 static __inline__
void unlock_kernel(void)
52 if (--current
->lock_depth
< 0)
53 spin_unlock(&kernel_flag
);
56 #endif /* _ASM_SMPLOCK_H */