562 	void *free_area, *shstk, *test_map = (void *)0xFFFFFFFFFFFFFFFF;  in test_guard_gap_other_gaps()  local
573 	while (test_map > shstk) {  in test_guard_gap_other_gaps()
574 		test_map = mmap(0, PAGE_SIZE, PROT_READ | PROT_WRITE,  in test_guard_gap_other_gaps()
576 		if (test_map == MAP_FAILED)  in test_guard_gap_other_gaps()
579 		cur->mapping = test_map;  in test_guard_gap_other_gaps()
594 	if (shstk - test_map - PAGE_SIZE != PAGE_SIZE)  in test_guard_gap_other_gaps()
605 	void *free_area, *shstk_start, *test_map = (void *)0xFFFFFFFFFFFFFFFF;  in test_guard_gap_new_mappings_gaps()  local
619 	while (test_map > shstk_start) {  in test_guard_gap_new_mappings_gaps()
620 		test_map = (void *)syscall(__NR_map_shadow_stack, 0, PAGE_SIZE, 0);  in test_guard_gap_new_mappings_gaps()
621 		if (test_map == MAP_FAILED) {  in test_guard_gap_new_mappings_gaps()
628 		cur->mapping = test_map;  in test_guard_gap_new_mappings_gaps()
633 		if (test_map == free_area + PAGE_SIZE) {  in test_guard_gap_new_mappings_gaps()