PAGE_UNUSED
memset((void *)unused_sub_pmd_start, PAGE_UNUSED,
memset((void *)page, PAGE_UNUSED, start - page);
memset((void *)start, PAGE_UNUSED, end - start);
return !memchr_inv((void *)page, PAGE_UNUSED, PMD_SIZE);
memset((void *)unused_pmd_start, PAGE_UNUSED,
memset((void *)addr, PAGE_UNUSED, end - addr);
return !memchr_inv((void *)start, PAGE_UNUSED, PMD_SIZE);
memset((void *)page, PAGE_UNUSED, start - page);