Re: [PATCH 10/10] mm, treewide: Redefine MAX_ORDER sanely

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

Hi Kirill,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on powerpc/next powerpc/fixes linus/master v6.3-rc2 next-20230315]
[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/Kirill-A-Shutemov/sparc-mm-Fix-MAX_ORDER-usage-in-tsb_grow/20230315-193254
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230315113133.11326-11-kirill.shutemov%40linux.intel.com
patch subject: [PATCH 10/10] mm, treewide: Redefine MAX_ORDER sanely
config: arm-randconfig-r033-20230313 (https://download.01.org/0day-ci/archive/20230315/202303152343.D93IbJmn-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/ccefb5df94c3c6c966f6f583d60c9d9c832b7a34
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kirill-A-Shutemov/sparc-mm-Fix-MAX_ORDER-usage-in-tsb_grow/20230315-193254
        git checkout ccefb5df94c3c6c966f6f583d60c9d9c832b7a34
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303152343.D93IbJmn-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/memblock.c:2046:11: warning: comparison of distinct pointer types ('typeof (11) *' (aka 'int *') and 'typeof (__ffs(start)) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
                   order = min(MAX_ORDER, __ffs(start));
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
   #define min(x, y)       __careful_cmp(x, y, <)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   1 warning generated.


vim +2046 mm/memblock.c

  2040	
  2041	static void __init __free_pages_memory(unsigned long start, unsigned long end)
  2042	{
  2043		int order;
  2044	
  2045		while (start < end) {
> 2046			order = min(MAX_ORDER, __ffs(start));
  2047	
  2048			while (start + (1UL << order) > end)
  2049				order--;
  2050	
  2051			memblock_free_pages(pfn_to_page(start), start, order);
  2052	
  2053			start += (1UL << order);
  2054		}
  2055	}
  2056	

-- 
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https://github.com/intel/lkp-tests