Re: [PATCH v2 6/9] fs: romfs: register an initrd fs detector

[kernel test robot <lkp@xxxxxxxxx>]

Hi Julian,

kernel test robot noticed the following build errors:

[auto build test ERROR on 88d324e69ea9f3ae1c1905ea75d717c08bdb8e15]

url:    https://github.com/intel-lab-lkp/linux/commits/Julian-Stecklina-via-B4-Relay/initrd-remove-ASCII-spinner/20250323-043649
base:   88d324e69ea9f3ae1c1905ea75d717c08bdb8e15
patch link:    https://lore.kernel.org/r/20250322-initrd-erofs-v2-6-d66ee4a2c756%40cyberus-technology.de
patch subject: [PATCH v2 6/9] fs: romfs: register an initrd fs detector
config: i386-buildonly-randconfig-002-20250323 (https://download.01.org/0day-ci/archive/20250323/202503230701.JV9cV28A-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250323/202503230701.JV9cV28A-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503230701.JV9cV28A-lkp@xxxxxxxxx/

All error/warnings (new ones prefixed by >>):

>> fs/romfs/initrd.c:22:33: error: macro "initrd_fs_detect" passed 2 arguments, but takes just 1
      22 | initrd_fs_detect(detect_romfs, 0);
         |                                 ^
   In file included from fs/romfs/initrd.c:4:
   include/linux/initrd.h:63: note: macro "initrd_fs_detect" defined here
      63 | #define initrd_fs_detect(detectfn)
         | 
>> fs/romfs/initrd.c:22:1: warning: data definition has no type or storage class
      22 | initrd_fs_detect(detect_romfs, 0);
         | ^~~~~~~~~~~~~~~~
>> fs/romfs/initrd.c:22:1: error: type defaults to 'int' in declaration of 'initrd_fs_detect' [-Werror=implicit-int]
>> fs/romfs/initrd.c:8:22: warning: 'detect_romfs' defined but not used [-Wunused-function]
       8 | static size_t __init detect_romfs(void *block_data)
         |                      ^~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/initrd_fs_detect +22 fs/romfs/initrd.c

     2	
     3	#include <linux/fs.h>
   > 4	#include <linux/initrd.h>
     5	#include <linux/magic.h>
     6	#include <linux/romfs_fs.h>
     7	
   > 8	static size_t __init detect_romfs(void *block_data)
     9	{
    10		struct romfs_super_block *romfsb
    11			= (struct romfs_super_block *)block_data;
    12		BUILD_BUG_ON(sizeof(*romfsb) > BLOCK_SIZE);
    13	
    14		/* The definitions of ROMSB_WORD* already handle endianness. */
    15		if (romfsb->word0 != ROMSB_WORD0 ||
    16		    romfsb->word1 != ROMSB_WORD1)
    17			return 0;
    18	
    19		return be32_to_cpu(romfsb->size);
    20	}
    21	
  > 22	initrd_fs_detect(detect_romfs, 0);

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