849 	int err = 0;  in unmerge_ksm_pages()  local
851 	for (addr = start; addr < end && !err; addr += PAGE_SIZE) {  in unmerge_ksm_pages()
855 			err = -ERESTARTSYS;  in unmerge_ksm_pages()
857 			err = break_ksm(vma, addr);  in unmerge_ksm_pages()
859 	return err;  in unmerge_ksm_pages()
880 	int err;  in remove_stable_node()  local
895 	err = -EBUSY;  in remove_stable_node()
907 		err = 0;  in remove_stable_node()
912 	return err;  in remove_stable_node()
944 	int err = 0;  in remove_all_stable_nodes()  local
952 				err = -EBUSY;  in remove_all_stable_nodes()
960 			err = -EBUSY;  in remove_all_stable_nodes()
963 	return err;  in remove_all_stable_nodes()
971 	int err = 0;  in unmerge_and_remove_all_rmap_items()  local
987 			err = unmerge_ksm_pages(vma,  in unmerge_and_remove_all_rmap_items()
989 			if (err)  in unmerge_and_remove_all_rmap_items()
1021 	return err;  in unmerge_and_remove_all_rmap_items()
1043 	int err = -EFAULT;  in write_protect_page()  local
1102 	err = 0;  in write_protect_page()
1109 	return err;  in write_protect_page()
1130 	int err = -EFAULT;  in replace_page()  local
1187 	err = 0;  in replace_page()
1191 	return err;  in replace_page()
1207 	int err = -EFAULT;  in try_to_merge_one_page()  local
1251 			err = 0;  in try_to_merge_one_page()
1253 			err = replace_page(vma, page, kpage, orig_pte);  in try_to_merge_one_page()
1256 	if ((vma->vm_flags & VM_LOCKED) && kpage && !err) {  in try_to_merge_one_page()
1269 	return err;  in try_to_merge_one_page()
1283 	int err = -EFAULT;  in try_to_merge_with_ksm_page()  local
1290 	err = try_to_merge_one_page(vma, page, kpage);  in try_to_merge_with_ksm_page()
1291 	if (err)  in try_to_merge_with_ksm_page()
1302 	return err;  in try_to_merge_with_ksm_page()
1320 	int err;  in try_to_merge_two_pages()  local
1322 	err = try_to_merge_with_ksm_page(rmap_item, page, NULL);  in try_to_merge_two_pages()
1323 	if (!err) {  in try_to_merge_two_pages()
1324 		err = try_to_merge_with_ksm_page(tree_rmap_item,  in try_to_merge_two_pages()
1330 		if (err)  in try_to_merge_two_pages()
1333 	return err ? NULL : page;  in try_to_merge_two_pages()
2045 	int err;  in cmp_and_merge_page()  local
2081 		err = try_to_merge_with_ksm_page(rmap_item, page, kpage);  in cmp_and_merge_page()
2082 		if (!err) {  in cmp_and_merge_page()
2118 			err = try_to_merge_one_page(vma, page,  in cmp_and_merge_page()
2125 			err = 0;  in cmp_and_merge_page()
2132 		if (!err)  in cmp_and_merge_page()
2442 	int err;  in ksm_madvise()  local
2467 			err = __ksm_enter(mm);  in ksm_madvise()
2468 			if (err)  in ksm_madvise()
2469 				return err;  in ksm_madvise()
2480 			err = unmerge_ksm_pages(vma, start, end);  in ksm_madvise()
2481 			if (err)  in ksm_madvise()
2482 				return err;  in ksm_madvise()
2851 	int err;  in sleep_millisecs_store()  local
2853 	err = kstrtoul(buf, 10, &msecs);  in sleep_millisecs_store()
2854 	if (err || msecs > UINT_MAX)  in sleep_millisecs_store()
2874 	int err;  in pages_to_scan_store()  local
2877 	err = kstrtoul(buf, 10, &nr_pages);  in pages_to_scan_store()
2878 	if (err || nr_pages > UINT_MAX)  in pages_to_scan_store()
2896 	int err;  in run_store()  local
2899 	err = kstrtoul(buf, 10, &flags);  in run_store()
2900 	if (err || flags > UINT_MAX)  in run_store()
2918 			err = unmerge_and_remove_all_rmap_items();  in run_store()
2920 			if (err) {  in run_store()
2922 				count = err;  in run_store()
2946 	int err;  in merge_across_nodes_store()  local
2949 	err = kstrtoul(buf, 10, &knob);  in merge_across_nodes_store()
2950 	if (err)  in merge_across_nodes_store()
2951 		return err;  in merge_across_nodes_store()
2959 			err = -EBUSY;  in merge_across_nodes_store()
2973 				err = -ENOMEM;  in merge_across_nodes_store()
2981 		if (!err) {  in merge_across_nodes_store()
2988 	return err ? err : count;  in merge_across_nodes_store()
3002 	int err;  in use_zero_pages_store()  local
3005 	err = kstrtobool(buf, &value);  in use_zero_pages_store()
3006 	if (err)  in use_zero_pages_store()
3025 	int err;  in max_page_sharing_store()  local
3028 	err = kstrtoint(buf, 10, &knob);  in max_page_sharing_store()
3029 	if (err)  in max_page_sharing_store()
3030 		return err;  in max_page_sharing_store()
3046 			err = -EBUSY;  in max_page_sharing_store()
3052 	return err ? err : count;  in max_page_sharing_store()
3122 	int err;  in stable_node_chains_prune_millisecs_store()  local
3124 	err = kstrtoul(buf, 10, &msecs);  in stable_node_chains_prune_millisecs_store()
3125 	if (err || msecs > UINT_MAX)  in stable_node_chains_prune_millisecs_store()
3170 	int err;  in ksm_init()  local
3177 	err = ksm_slab_init();  in ksm_init()
3178 	if (err)  in ksm_init()
3184 		err = PTR_ERR(ksm_thread);  in ksm_init()
3189 	err = sysfs_create_group(mm_kobj, &ksm_attr_group);  in ksm_init()
3190 	if (err) {  in ksm_init()
3209 	return err;  in ksm_init()