#ifndef _ASM_POWERPC_MEMBARRIER_H
#define _ASM_POWERPC_MEMBARRIER_H

static inline void membarrier_arch_switch_mm(struct mm_struct *prev,
                         struct mm_struct *next,
                         struct task_struct *tsk)
{
    /*
     * Only need the full barrier when switching between processes.
     * Barrier when switching from kernel to userspace is not
     * required here, given that it is implied by mmdrop(). Barrier
     * when switching from userspace to kernel is not needed after
     * store to rq->curr.
     */
    if (IS_ENABLED(CONFIG_SMP) &&
        likely(!(atomic_read(&next->membarrier_state) &
             (MEMBARRIER_STATE_PRIVATE_EXPEDITED |
              MEMBARRIER_STATE_GLOBAL_EXPEDITED)) || !prev))
        return;

    /*
     * The membarrier system call requires a full memory barrier
     * after storing to rq->curr, before going back to user-space.
     */
    smp_mb();
}

#endif /* _ASM_POWERPC_MEMBARRIER_H */