mmu_notifier_get_locked
mn = mmu_notifier_get_locked(&gru_mmuops, current->mm);
struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops,
ret = mmu_notifier_get_locked(ops, mm);
EXPORT_SYMBOL_GPL(mmu_notifier_get_locked);