[broonie-ci:arm64-gcs 1/48] include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant

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

Hi Rick,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/ci.git arm64-gcs
head:   e90b1663883e49f3f5aef612fde57503c21ad1ad
commit: 7a8d3d70c8ecb0b3392221a446051a64f9cbadda [1/48] mm: Rename arch pte_mkwrite()'s to pte_mkwrite_novma()
config: sparc-sparc64_defconfig (https://download.01.org/0day-ci/archive/20230715/202307151450.SZseecBC-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230715/202307151450.SZseecBC-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/202307151450.SZseecBC-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/mm.h:29,
                    from include/sound/pcm.h:15,
                    from sound/drivers/dummy.c:20:
   include/linux/pgtable.h: In function 'pmd_mkwrite':
   include/linux/pgtable.h:528:16: error: implicit declaration of function 'pmd_mkwrite_novma'; did you mean 'pte_mkwrite_novma'? [-Werror=implicit-function-declaration]
     528 |         return pmd_mkwrite_novma(pmd);
         |                ^~~~~~~~~~~~~~~~~
         |                pte_mkwrite_novma
   include/linux/pgtable.h:528:16: error: incompatible types when returning type 'int' but 'pmd_t' was expected
     528 |         return pmd_mkwrite_novma(pmd);
         |                ^~~~~~~~~~~~~~~~~~~~~~
   In file included from include/linux/init.h:5,
                    from sound/drivers/dummy.c:7:
   sound/drivers/dummy.c: At top level:
>> include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant
      16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
         |                                                   ^
   include/linux/compiler.h:231:33: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
     231 | #define __must_be_array(a)      BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
         |                                 ^~~~~~~~~~~~~~~~~
   include/linux/kernel.h:56:59: note: in expansion of macro '__must_be_array'
      56 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
         |                                                           ^~~~~~~~~~~~~~~
   include/linux/moduleparam.h:517:20: note: in expansion of macro 'ARRAY_SIZE'
     517 |         = { .max = ARRAY_SIZE(array), .num = nump,                      \
         |                    ^~~~~~~~~~
   include/linux/moduleparam.h:501:9: note: in expansion of macro 'module_param_array_named'
     501 |         module_param_array_named(name, name, type, nump, perm)
         |         ^~~~~~~~~~~~~~~~~~~~~~~~
   sound/drivers/dummy.c:62:1: note: in expansion of macro 'module_param_array'
      62 | module_param_array(index, int, NULL, 0444);
         | ^~~~~~~~~~~~~~~~~~
   sound/drivers/dummy.c:48:12: warning: 'index' defined but not used [-Wunused-variable]
      48 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
         |            ^~~~~
   cc1: some warnings being treated as errors


vim +16 include/linux/build_bug.h

bc6245e5efd70c Ian Abbott       2017-07-10   6  
bc6245e5efd70c Ian Abbott       2017-07-10   7  #ifdef __CHECKER__
bc6245e5efd70c Ian Abbott       2017-07-10   8  #define BUILD_BUG_ON_ZERO(e) (0)
bc6245e5efd70c Ian Abbott       2017-07-10   9  #else /* __CHECKER__ */
bc6245e5efd70c Ian Abbott       2017-07-10  10  /*
bc6245e5efd70c Ian Abbott       2017-07-10  11   * Force a compilation error if condition is true, but also produce a
8788994376d84d Rikard Falkeborn 2019-12-04  12   * result (of value 0 and type int), so the expression can be used
bc6245e5efd70c Ian Abbott       2017-07-10  13   * e.g. in a structure initializer (or where-ever else comma expressions
bc6245e5efd70c Ian Abbott       2017-07-10  14   * aren't permitted).
bc6245e5efd70c Ian Abbott       2017-07-10  15   */
8788994376d84d Rikard Falkeborn 2019-12-04 @16  #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
527edbc18a70e7 Masahiro Yamada  2019-01-03  17  #endif /* __CHECKER__ */
527edbc18a70e7 Masahiro Yamada  2019-01-03  18  

:::::: The code at line 16 was first introduced by commit
:::::: 8788994376d84d627450fd0d67deb6a66ddf07d7 linux/build_bug.h: change type to int

:::::: TO: Rikard Falkeborn <rikard.falkeborn@gmail.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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