#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 */