include/linux/build_bug.h:78:41: error: static assertion failed: "XFS: sizeof(struct xfs_attr_sf_entry) is wrong, expected 3"

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

Hi Darrick,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3a8660878839faadb4f1a6dd72c3179c1df56787
commit: 13877bc79d81354c53e91f3c86ac0f7bafe3ba7b xfs: port ondisk structure checks from xfs/122 to the kernel
date:   11 months ago
config: arm-randconfig-003-20251013 (https://download.01.org/0day-ci/archive/20251013/202510130901.BneH1ELf-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251013/202510130901.BneH1ELf-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/202510130901.BneH1ELf-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/bitfield.h:10,
                    from include/linux/fortify-string.h:5,
                    from include/linux/string.h:390,
                    from include/linux/uuid.h:11,
                    from fs/xfs/xfs_linux.h:10,
                    from fs/xfs/xfs.h:26,
                    from fs/xfs/xfs_super.c:7:
   fs/xfs/libxfs/xfs_ondisk.h: In function 'xfs_check_ondisk_structs':
>> include/linux/build_bug.h:78:41: error: static assertion failed: "XFS: sizeof(struct xfs_attr_sf_entry) is wrong, expected 3"
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                         ^~~~~~~~~~~~~~
   include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ^~~~~~~~~~~~~~~
   fs/xfs/libxfs/xfs_ondisk.h:10:9: note: in expansion of macro 'static_assert'
      10 |         static_assert(sizeof(structname) == (size), \
         |         ^~~~~~~~~~~~~
   fs/xfs/libxfs/xfs_ondisk.h:133:9: note: in expansion of macro 'XFS_CHECK_STRUCT_SIZE'
     133 |         XFS_CHECK_STRUCT_SIZE(struct xfs_attr_sf_entry,         3);
         |         ^~~~~~~~~~~~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "XFS: sizeof(struct xfs_dir2_data_unused) is wrong, expected 6"
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                         ^~~~~~~~~~~~~~
   include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ^~~~~~~~~~~~~~~
   fs/xfs/libxfs/xfs_ondisk.h:10:9: note: in expansion of macro 'static_assert'
      10 |         static_assert(sizeof(structname) == (size), \
         |         ^~~~~~~~~~~~~
   fs/xfs/libxfs/xfs_ondisk.h:136:9: note: in expansion of macro 'XFS_CHECK_STRUCT_SIZE'
     136 |         XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_data_unused,      6);
         |         ^~~~~~~~~~~~~~~~~~~~~


vim +78 include/linux/build_bug.h

bc6245e5efd70c Ian Abbott       2017-07-10  60  
6bab69c65013be Rasmus Villemoes 2019-03-07  61  /**
6bab69c65013be Rasmus Villemoes 2019-03-07  62   * static_assert - check integer constant expression at build time
6bab69c65013be Rasmus Villemoes 2019-03-07  63   *
6bab69c65013be Rasmus Villemoes 2019-03-07  64   * static_assert() is a wrapper for the C11 _Static_assert, with a
6bab69c65013be Rasmus Villemoes 2019-03-07  65   * little macro magic to make the message optional (defaulting to the
6bab69c65013be Rasmus Villemoes 2019-03-07  66   * stringification of the tested expression).
6bab69c65013be Rasmus Villemoes 2019-03-07  67   *
6bab69c65013be Rasmus Villemoes 2019-03-07  68   * Contrary to BUILD_BUG_ON(), static_assert() can be used at global
6bab69c65013be Rasmus Villemoes 2019-03-07  69   * scope, but requires the expression to be an integer constant
6bab69c65013be Rasmus Villemoes 2019-03-07  70   * expression (i.e., it is not enough that __builtin_constant_p() is
6bab69c65013be Rasmus Villemoes 2019-03-07  71   * true for expr).
6bab69c65013be Rasmus Villemoes 2019-03-07  72   *
6bab69c65013be Rasmus Villemoes 2019-03-07  73   * Also note that BUILD_BUG_ON() fails the build if the condition is
6bab69c65013be Rasmus Villemoes 2019-03-07  74   * true, while static_assert() fails the build if the expression is
6bab69c65013be Rasmus Villemoes 2019-03-07  75   * false.
6bab69c65013be Rasmus Villemoes 2019-03-07  76   */
6bab69c65013be Rasmus Villemoes 2019-03-07  77  #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
6bab69c65013be Rasmus Villemoes 2019-03-07 @78  #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
6bab69c65013be Rasmus Villemoes 2019-03-07  79  
07a368b3f55a79 Maxim Levitsky   2022-10-25  80  

:::::: The code at line 78 was first introduced by commit
:::::: 6bab69c65013bed5fce9f101a64a84d0385b3946 build_bug.h: add wrapper for _Static_assert

:::::: TO: Rasmus Villemoes <linux@rasmusvillemoes.dk>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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