Re: [PATCH 3/3] mm: hugetlb: add hugetlb_free_vmemmap sysctl

[kernel test robot <lkp@intel.com>]

Hi Muchun,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on hnaz-mm/master]
[also build test ERROR on next-20220225]
[cannot apply to mcgrof/sysctl-next linus/master v5.17-rc6]
[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/Muchun-Song/add-hugetlb_free_vmemmap-sysctl/20220228-151303
base:   https://github.com/hnaz/linux-mm master
config: x86_64-randconfig-a001 (https://download.01.org/0day-ci/archive/20220228/202202282100.zrlKlzBR-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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/0day-ci/linux/commit/a2a3193fd949ff24ed0c138ef495e67373839483
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Muchun-Song/add-hugetlb_free_vmemmap-sysctl/20220228-151303
        git checkout a2a3193fd949ff24ed0c138ef495e67373839483
        # save the config file to linux build tree
        mkdir build_dir
        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 as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> mm/hugetlb_vmemmap.c:156:55: error: use of undeclared identifier 'memmap_on_memory'
           if (write && (!is_power_of_2(sizeof(struct page)) || memmap_on_memory))
                                                                ^
   1 error generated.


vim +/memmap_on_memory +156 mm/hugetlb_vmemmap.c

   148	
   149	int hugetlb_vmemmap_sysctl_handler(struct ctl_table *table, int write,
   150					   void *buffer, size_t *length, loff_t *ppos)
   151	{
   152		/*
   153		 * The vmemmap pages cannot be optimized if a "struct page" crosses page
   154		 * boundaries or memory_hotplug.memmap_on_memory is enabled.
   155		 */
 > 156		if (write && (!is_power_of_2(sizeof(struct page)) || memmap_on_memory))

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org