28 lines
846 B
C
28 lines
846 B
C
#ifndef _ASM_POWERPC_MEMBARRIER_H
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#define _ASM_POWERPC_MEMBARRIER_H
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static inline void membarrier_arch_switch_mm(struct mm_struct *prev,
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struct mm_struct *next,
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struct task_struct *tsk)
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{
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/*
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* Only need the full barrier when switching between processes.
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* Barrier when switching from kernel to userspace is not
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* required here, given that it is implied by mmdrop(). Barrier
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* when switching from userspace to kernel is not needed after
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* store to rq->curr.
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*/
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if (likely(!(atomic_read(&next->membarrier_state) &
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(MEMBARRIER_STATE_PRIVATE_EXPEDITED |
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MEMBARRIER_STATE_GLOBAL_EXPEDITED)) || !prev))
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return;
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/*
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* The membarrier system call requires a full memory barrier
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* after storing to rq->curr, before going back to user-space.
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*/
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smp_mb();
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}
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#endif /* _ASM_POWERPC_MEMBARRIER_H */
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