default:
                return -ENOTTY;
        case MTRRIOC_ADD_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_ADD_ENTRY:
+#endif
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
                err =
                                  file, 0);
                break;
        case MTRRIOC_SET_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_SET_ENTRY:
+#endif
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
                err = mtrr_add(sentry.base, sentry.size, sentry.type, 0);
                break;
        case MTRRIOC_DEL_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_DEL_ENTRY:
+#endif
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
                err = mtrr_file_del(sentry.base, sentry.size, file, 0);
                break;
        case MTRRIOC_KILL_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_KILL_ENTRY:
+#endif
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
                err = mtrr_del(-1, sentry.base, sentry.size);
                break;
        case MTRRIOC_GET_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_GET_ENTRY:
+#endif
                if (gentry.regnum >= num_var_ranges)
                        return -EINVAL;
                mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
 
                break;
        case MTRRIOC_ADD_PAGE_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_ADD_PAGE_ENTRY:
+#endif
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
                err =
                                  file, 1);
                break;
        case MTRRIOC_SET_PAGE_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_SET_PAGE_ENTRY:
+#endif
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
                err = mtrr_add_page(sentry.base, sentry.size, sentry.type, 0);
                break;
        case MTRRIOC_DEL_PAGE_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_DEL_PAGE_ENTRY:
+#endif
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
                err = mtrr_file_del(sentry.base, sentry.size, file, 1);
                break;
        case MTRRIOC_KILL_PAGE_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_KILL_PAGE_ENTRY:
+#endif
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
                err = mtrr_del_page(-1, sentry.base, sentry.size);
                break;
        case MTRRIOC_GET_PAGE_ENTRY:
+#ifdef CONFIG_COMPAT
+       case MTRRIOC32_GET_PAGE_ENTRY:
+#endif
                if (gentry.regnum >= num_var_ranges)
                        return -EINVAL;
                mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);