Re: [PATCH v2 4/7] mm: page_owner: add support for splitting to any order in split page_owner.

From: kernel test robot
Date: Wed Mar 29 2023 - 10:49:27 EST


Hi Zi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.3-rc4 next-20230329]
[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#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Zi-Yan/mm-memcg-use-order-instead-of-nr-in-split_page_memcg/20230329-091809
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20230329011712.3242298-5-zi.yan%40sent.com
patch subject: [PATCH v2 4/7] mm: page_owner: add support for splitting to any order in split page_owner.
config: x86_64-randconfig-a016 (https://download.01.org/0day-ci/archive/20230329/202303292237.pg39cTKv-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/6d1831c0e01a1a742e026454fe6e5643e08c5985
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Zi-Yan/mm-memcg-use-order-instead-of-nr-in-split_page_memcg/20230329-091809
git checkout 6d1831c0e01a1a742e026454fe6e5643e08c5985
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202303292237.pg39cTKv-lkp@xxxxxxxxx/

All error/warnings (new ones prefixed by >>):

>> mm/page_owner.c:226:14: error: implicit declaration of function 'lookup_page_ext' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
page_ext = lookup_page_ext(page + i);
^
>> mm/page_owner.c:226:12: warning: incompatible integer to pointer conversion assigning to 'struct page_ext *' from 'int' [-Wint-conversion]
page_ext = lookup_page_ext(page + i);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning and 1 error generated.


vim +/lookup_page_ext +226 mm/page_owner.c

213
214 void __split_page_owner(struct page *page, int old_order, int new_order)
215 {
216 int i;
217 struct page_ext *page_ext = page_ext_get(page);
218 struct page_owner *page_owner;
219 unsigned int old_nr = 1 << old_order;
220 unsigned int new_nr = 1 << new_order;
221
222 if (unlikely(!page_ext))
223 return;
224
225 for (i = 0; i < old_nr; i += new_nr) {
> 226 page_ext = lookup_page_ext(page + i);
227 page_owner = get_page_owner(page_ext);
228 page_owner->order = new_order;
229 }
230 page_ext_put(page_ext);
231 }
232

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests