/*
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/*
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* <asm/smplock.h>
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* <asm/smplock.h>
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*
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*
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* Default SMP lock implementation
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* Default SMP lock implementation
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*/
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*/
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <asm/current.h>
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#include <asm/current.h>
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#include <asm/hardirq.h>
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#include <asm/hardirq.h>
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extern spinlock_t kernel_flag;
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extern spinlock_t kernel_flag;
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#define kernel_locked() spin_is_locked(&kernel_flag)
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#define kernel_locked() spin_is_locked(&kernel_flag)
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/*
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/*
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* Release global kernel lock and global interrupt lock
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* Release global kernel lock and global interrupt lock
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*/
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*/
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static __inline__ void
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static __inline__ void
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release_kernel_lock(struct task_struct *task, int cpu)
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release_kernel_lock(struct task_struct *task, int cpu)
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{
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{
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if (task->lock_depth >= 0)
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if (task->lock_depth >= 0)
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spin_unlock(&kernel_flag);
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spin_unlock(&kernel_flag);
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release_irqlock(cpu);
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release_irqlock(cpu);
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__sti();
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__sti();
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}
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}
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/*
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/*
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* Re-acquire the kernel lock
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* Re-acquire the kernel lock
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*/
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*/
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static __inline__ void
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static __inline__ void
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reacquire_kernel_lock(struct task_struct *task)
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reacquire_kernel_lock(struct task_struct *task)
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{
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{
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if (task->lock_depth >= 0)
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if (task->lock_depth >= 0)
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spin_lock(&kernel_flag);
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spin_lock(&kernel_flag);
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}
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}
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/*
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/*
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* Getting the big kernel lock.
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* Getting the big kernel lock.
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*
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*
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* This cannot happen asynchronously,
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* This cannot happen asynchronously,
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* so we only need to worry about other
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* so we only need to worry about other
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* CPU's.
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* CPU's.
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*/
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*/
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static __inline__ void
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static __inline__ void
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lock_kernel(void)
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lock_kernel(void)
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{
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{
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if (!++current->lock_depth)
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if (!++current->lock_depth)
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spin_lock(&kernel_flag);
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spin_lock(&kernel_flag);
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}
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}
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static __inline__ void
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static __inline__ void
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unlock_kernel(void)
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unlock_kernel(void)
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{
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{
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if (--current->lock_depth < 0)
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if (--current->lock_depth < 0)
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spin_unlock(&kernel_flag);
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spin_unlock(&kernel_flag);
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}
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}
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