arm_smmu_invs_purge
test_a = arm_smmu_invs_purge(test_b);
test_b = arm_smmu_invs_purge(test_a);
EXPORT_SYMBOL_IF_KUNIT(arm_smmu_invs_purge);
new_invs = arm_smmu_invs_purge(old_invs);
struct arm_smmu_invs *arm_smmu_invs_purge(struct arm_smmu_invs *invs);