Hi Mike, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on linus/master] [also build test WARNING on v5.12-rc3 next-20210319] [cannot apply to linux/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Mike-Kravetz/hugetlb-add-demote-... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 144c79ef33536b4ecb4951e07dbc1f2b7fa99d32 config: i386-randconfig-r005-20210318 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/c49b5026f94b3358774d991cd0b2c2f57... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Mike-Kravetz/hugetlb-add-demote-split-page-functionality/20210309-081944 git checkout c49b5026f94b3358774d991cd0b2c2f5720c07a7 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): mm/hugetlb.c: In function 'demote_size_show': 3011 | unsigned long demote_size; | ^~~~~~~~~~~ vim +/demote_size +3011 mm/hugetlb.c 3006 3007 static ssize_t demote_size_show(struct kobject *kobj, 3008 struct kobj_attribute *attr, char *buf) 3009 { 3010 struct hstate *h; 3012 int nid; 3013 3014 h = kobj_to_hstate(kobj, &nid); 3015 demote_size = h->demote_order; 3016 3017 return sysfs_emit(buf, "%lukB\n", 3018 (unsigned long)(PAGE_SIZE << h->demote_order) / SZ_1K); 3019 } 3020 HSTATE_ATTR_RO(demote_size); 3021 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org