Hi huijin.park,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on block/for-next]
[also build test WARNING on next-20180727]
[cannot apply to v4.18-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Huijin-Park/genhd-incrase-size-of-disk-stat-counters/20180731-173548
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=um SUBARCH=x86_64

All warnings (new ones prefixed by >>):

   fs/ext4/sysfs.c: In function 'session_write_kbytes_show':

quoted

fs/ext4/sysfs.c:58:37: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'long long unsigned int' [-Wformat=]

     return snprintf(buf, PAGE_SIZE, "%lu\n",
                                      ~~^
                                      %llu
       (part_stat_read(sb->s_bdev->bd_part,
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         sectors[STAT_WRITE]) -
         ~~~~~~~~~~~~~~~~~~~~~~          
        sbi->s_sectors_written_start) >> 1);
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +58 fs/ext4/sysfs.c

b5799018 Theodore Ts'o    2015-09-23  51  
6ca06829 Tyson Nottingham 2018-03-30  52  static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
b5799018 Theodore Ts'o    2015-09-23  53  {
b5799018 Theodore Ts'o    2015-09-23  54  	struct super_block *sb = sbi->s_buddy_cache->i_sb;
b5799018 Theodore Ts'o    2015-09-23  55  
b5799018 Theodore Ts'o    2015-09-23  56  	if (!sb->s_bdev->bd_part)
b5799018 Theodore Ts'o    2015-09-23  57  		return snprintf(buf, PAGE_SIZE, "0\n");
b5799018 Theodore Ts'o    2015-09-23 @58  	return snprintf(buf, PAGE_SIZE, "%lu\n",
dbae2c55 Michael Callahan 2018-07-18  59  			(part_stat_read(sb->s_bdev->bd_part,
dbae2c55 Michael Callahan 2018-07-18  60  					sectors[STAT_WRITE]) -
b5799018 Theodore Ts'o    2015-09-23  61  			 sbi->s_sectors_written_start) >> 1);
b5799018 Theodore Ts'o    2015-09-23  62  }
b5799018 Theodore Ts'o    2015-09-23  63  

:::::: The code at line 58 was first introduced by commit
:::::: b5799018827e67867fda77c3cde10fc080606fe2 ext4: move sysfs code from super.c to fs/ext4/sysfs.c

:::::: TO: Theodore Ts'o [off-list ref]
:::::: CC: Theodore Ts'o [off-list ref]

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