smplock.h

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    1 /*
    2  * <asm/smplock.h>
    3  *
    4  * Default SMP lock implementation
    5  */
    6 #ifndef __ASM_SMPLOCK_H
    7 #define __ASM_SMPLOCK_H
    8 
    9 #include <linux/sched.h>
   10 #include <linux/interrupt.h>
   11 #include <linux/spinlock.h>
   12 
   13 extern spinlock_t kernel_flag;
   14 
   15 #define kernel_locked()                 spin_is_locked(&kernel_flag)
   16 
   17 /*
   18  * Release global kernel lock and global interrupt lock
   19  */
   20 static __inline__ void release_kernel_lock(struct task_struct *task, int cpu)
   21 {
   22         if (task->lock_depth >= 0)
   23                 spin_unlock(&kernel_flag);
   24         release_irqlock(cpu);
   25         __sti();
   26 }
   27 
   28 /*
   29  * Re-acquire the kernel lock
   30  */
   31 static __inline__ void reacquire_kernel_lock(struct task_struct *task)
   32 {
   33         if (task->lock_depth >= 0)
   34                 spin_lock(&kernel_flag);
   35 }
   36 
   37 /*
   38  * Getting the big kernel lock.
   39  *
   40  * This cannot happen asynchronously,
   41  * so we only need to worry about other
   42  * CPU's.
   43  */
   44 static __inline__ void lock_kernel(void)
   45 {
   46         if (!++current->lock_depth)
   47                 spin_lock(&kernel_flag);
   48 }
   49 
   50 static __inline__ void unlock_kernel(void)
   51 {
   52         if (--current->lock_depth < 0)
   53                 spin_unlock(&kernel_flag);
   54 }
   55 
   56 #endif /* __ASM_SMPLOCK_H */

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FreeBSD/Linux Kernel Cross Reference sys/include/asm-mips64/smplock.h

FreeBSD/Linux Kernel Cross Reference
sys/include/asm-mips64/smplock.h