Hi Song,

I love your patch! Perhaps something to improve:

[auto build test WARNING on dm/for-next]
[also build test WARNING on linux/master linus/master v5.10-rc7 next-20201209]
[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/Song-Liu/Revert-dm-raid-remove-unnecessary-discard-limits-for-raid10/20201210-060948
base:   https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next
config: x86_64-randconfig-a006-20201209 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1968804ac726e7674d5de22bc2204b45857da344)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/c041d7bf65519d8a09a4193a0963fdcadcfd639b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Song-Liu/Revert-dm-raid-remove-unnecessary-discard-limits-for-raid10/20201210-060948
        git checkout c041d7bf65519d8a09a4193a0963fdcadcfd639b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

quoted

drivers/md/dm-raid.c:3739:33: warning: comparison of distinct pointer types ('typeof (__x) *' (aka 'int *') and 'typeof (__y) *' (aka 'unsigned int *')) [-Wcompare-distinct-pointer-types]

                   limits->max_discard_sectors = min_not_zero(rs->md.chunk_sectors,
                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:84:39: note: expanded from macro 'min_not_zero'
           __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
                                                ^~~~~~~~~~~~~
   include/linux/minmax.h:51:19: note: expanded from macro 'min'
   #define min(x, y)       __careful_cmp(x, y, <)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:42:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:32:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:18:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   1 warning generated.

vim +3739 drivers/md/dm-raid.c

  3723	
  3724	static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
  3725	{
  3726		struct raid_set *rs = ti->private;
  3727		unsigned int chunk_size_bytes = to_bytes(rs->md.chunk_sectors);
  3728	
  3729		blk_limits_io_min(limits, chunk_size_bytes);
  3730		blk_limits_io_opt(limits, chunk_size_bytes * mddev_data_stripes(rs));
  3731	
  3732		/*
  3733		 * RAID10 personality requires bio splitting,
  3734		 * RAID0/1/4/5/6 don't and process large discard bios properly.
  3735		 */
  3736		if (rs_is_raid10(rs)) {
  3737			limits->discard_granularity = max(chunk_size_bytes,
  3738							  limits->discard_granularity);

3739			limits->max_discard_sectors = min_not_zero(rs->md.chunk_sectors,

  3740								   limits->max_discard_sectors);
  3741		}
  3742	}
  3743	

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