[linux-next:master 1705/2217] fs/bcachefs/btree_write_buffer_types.h:23:9: warning: alignment 1 of 'struct <anonymous>' is less than 4

[linux-next:master 1705/2217] fs/bcachefs/btree_write_buffer_types.h:23:9: warning: alignment 1 of 'struct <anonymous>' is less than 4

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   07b677953b9dca02928be323e2db853511305fa9
commit: 9e5a6c7797b240f138b9bdd75d85d8f7c6f0e06d [1705/2217] bcachefs: btree write buffer now slurps keys from journal
config: i386-randconfig-141-20231121 (https://download.01.org/0day-ci/archive/20231121/202311212232.BHiGGdEF-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231121/202311212232.BHiGGdEF-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/202311212232.BHiGGdEF-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/bcachefs/bcachefs.h:421,
                    from fs/bcachefs/acl.c:3:
>> fs/bcachefs/btree_write_buffer_types.h:23:9: warning: alignment 1 of 'struct <anonymous>' is less than 4 [-Wpacked-not-aligned]
      23 |         } __packed;
         |         ^
>> fs/bcachefs/btree_write_buffer_types.h:16:49: warning: 'pos' offset 3 in 'struct <anonymous>' isn't aligned to 4 [-Wpacked-not-aligned]
      16 |                 struct bpos                     pos;
         |                                                 ^~~
   In file included from fs/bcachefs/str_hash.h:8,
                    from fs/bcachefs/xattr.h:5,
                    from fs/bcachefs/acl.c:6:
   fs/bcachefs/error.h: In function 'bch2_bkey_fsck_err':
   fs/bcachefs/error.h:168:9: warning: function 'bch2_bkey_fsck_err' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
     168 |         prt_vprintf(err_msg, fmt, args);
         |         ^~~~~~~~~~~
--
   In file included from fs/bcachefs/bcachefs.h:421,
                    from fs/bcachefs/bkey.c:3:
>> fs/bcachefs/btree_write_buffer_types.h:23:9: warning: alignment 1 of 'struct <anonymous>' is less than 4 [-Wpacked-not-aligned]
      23 |         } __packed;
         |         ^
>> fs/bcachefs/btree_write_buffer_types.h:16:49: warning: 'pos' offset 3 in 'struct <anonymous>' isn't aligned to 4 [-Wpacked-not-aligned]
      16 |                 struct bpos                     pos;
         |                                                 ^~~
--
   In file included from fs/bcachefs/bcachefs.h:421,
                    from fs/bcachefs/sb-errors.c:3:
>> fs/bcachefs/btree_write_buffer_types.h:23:9: warning: alignment 1 of 'struct <anonymous>' is less than 4 [-Wpacked-not-aligned]
      23 |         } __packed;
         |         ^
>> fs/bcachefs/btree_write_buffer_types.h:16:49: warning: 'pos' offset 3 in 'struct <anonymous>' isn't aligned to 4 [-Wpacked-not-aligned]
      16 |                 struct bpos                     pos;
         |                                                 ^~~
   fs/bcachefs/sb-errors.c:9:21: warning: initialized field overwritten [-Woverride-init]
       9 |         BCH_SB_ERRS()
         |                     ^
   fs/bcachefs/sb-errors.c:8:29: note: in definition of macro 'x'
       8 | #define x(t, n, ...) [n] = #t,
         |                             ^
   fs/bcachefs/sb-errors.c:9:9: note: in expansion of macro 'BCH_SB_ERRS'
       9 |         BCH_SB_ERRS()
         |         ^~~~~~~~~~~
   fs/bcachefs/sb-errors.c:9:21: note: (near initialization for 'bch2_sb_error_strs[50]')
       9 |         BCH_SB_ERRS()
         |                     ^
   fs/bcachefs/sb-errors.c:8:29: note: in definition of macro 'x'
       8 | #define x(t, n, ...) [n] = #t,
         |                             ^
   fs/bcachefs/sb-errors.c:9:9: note: in expansion of macro 'BCH_SB_ERRS'
       9 |         BCH_SB_ERRS()
         |         ^~~~~~~~~~~


vim +23 fs/bcachefs/btree_write_buffer_types.h

    10	
    11	struct wb_key_ref {
    12	union {
    13		struct {
    14	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
    15			unsigned			idx:24;
  > 16			struct bpos			pos;
    17			enum btree_id			btree:8;
    18	#else
    19			enum btree_id			btree:8;
    20			struct bpos			pos;
    21			unsigned			idx:24;
    22	#endif
  > 23		} __packed;
    24		struct {
    25	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
    26			u64 lo;
    27			u64 mi;
    28			u64 hi;
    29	#else
    30			u64 hi;
    31			u64 mi;
    32			u64 lo;
    33	#endif
    34		};
    35	};
    36	};
    37	

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