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Linux/arch/powerpc/include/asm/membarrier.h

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  1 #ifndef _ASM_POWERPC_MEMBARRIER_H
  2 #define _ASM_POWERPC_MEMBARRIER_H
  3 
  4 static inline void membarrier_arch_switch_mm(struct mm_struct *prev,
  5                                              struct mm_struct *next,
  6                                              struct task_struct *tsk)
  7 {
  8         /*
  9          * Only need the full barrier when switching between processes.
 10          * Barrier when switching from kernel to userspace is not
 11          * required here, given that it is implied by mmdrop(). Barrier
 12          * when switching from userspace to kernel is not needed after
 13          * store to rq->curr.
 14          */
 15         if (likely(!(atomic_read(&next->membarrier_state) &
 16                      (MEMBARRIER_STATE_PRIVATE_EXPEDITED |
 17                       MEMBARRIER_STATE_GLOBAL_EXPEDITED)) || !prev))
 18                 return;
 19 
 20         /*
 21          * The membarrier system call requires a full memory barrier
 22          * after storing to rq->curr, before going back to user-space.
 23          */
 24         smp_mb();
 25 }
 26 
 27 #endif /* _ASM_POWERPC_MEMBARRIER_H */
 28 

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