Hi Park,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3 next-20190917]
[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/Park-Ju-Hyung/staging-exfat-rebase-to-sdFAT-v2-2-0/20190919-040526
config: i386-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/staging/exfat/misc.c: In function 'exfat_uevent_ro_remount':
>> drivers/staging/exfat/misc.c:57:2: error: implicit declaration of function 'ST_LOG'; did you mean 'PT_LOAD'? [-Werror=implicit-function-declaration]
     ST_LOG("[EXFAT](%s[%d:%d]): Uevent triggered\n",
     ^~~~~~
     PT_LOAD
   cc1: some warnings being treated as errors

vim +57 drivers/staging/exfat/misc.c

    43	
    44	void exfat_uevent_ro_remount(struct super_block *sb)
    45	{
    46		struct block_device *bdev = sb->s_bdev;
    47		dev_t bd_dev = bdev ? bdev->bd_dev : 0;
    48	
    49		char major[16], minor[16];
    50		char *envp[] = { major, minor, NULL };
    51	
    52		snprintf(major, sizeof(major), "MAJOR=%d", MAJOR(bd_dev));
    53		snprintf(minor, sizeof(minor), "MINOR=%d", MINOR(bd_dev));
    54	
    55		kobject_uevent_env(&exfat_uevent_kobj, KOBJ_CHANGE, envp);
    56	
  > 57		ST_LOG("[EXFAT](%s[%d:%d]): Uevent triggered\n",
    58				sb->s_id, MAJOR(bd_dev), MINOR(bd_dev));
    59	}
    60	#endif
    61	

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