Re: [PATCH v4] erofs: Add support for FS_IOC_GETFSLABEL

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

Hi Bo,

kernel test robot noticed the following build errors:

[auto build test ERROR on xiang-erofs/dev-test]
[also build test ERROR on xiang-erofs/dev xiang-erofs/fixes linus/master v6.17-rc7 next-20250922]
[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/Bo-Liu/erofs-Add-support-for-FS_IOC_GETFSLABEL/20250922-173127
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git dev-test
patch link:    https://lore.kernel.org/r/20250922092937.2055-1-liubo03%40inspur.com
patch subject: [PATCH v4] erofs: Add support for FS_IOC_GETFSLABEL
config: sparc64-randconfig-001-20250923 (https://download.01.org/0day-ci/archive/20250923/202509231033.ADjNYvqL-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project cafc064fc7a96b3979a023ddae1da2b499d6c954)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250923/202509231033.ADjNYvqL-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509231033.ADjNYvqL-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/erofs/inode.c:372:47: error: call to undeclared function 'compat_ptr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     372 |         return erofs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
         |                                                      ^
   1 error generated.


vim +/compat_ptr +372 fs/erofs/inode.c

   367	
   368	#ifdef CONFIG_COMPAT
   369	long erofs_compat_ioctl(struct file *filp, unsigned int cmd,
   370				unsigned long arg)
   371	{
 > 372		return erofs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
   373	}
   374	#endif
   375	

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