Re: [PATCH] Add support for empty path in openat and openat2 syscalls

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

Hi Jori,

kernel test robot noticed the following build errors:

[auto build test ERROR on brauner-vfs/vfs.all]
[also build test ERROR on linus/master v7.0-rc1 next-20260220]
[cannot apply to arnd-asm-generic/master]
[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/Jori-Koolstra/Add-support-for-empty-path-in-openat-and-openat2-syscalls/20260223-232002
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all
patch link:    https://lore.kernel.org/r/20260223151652.582048-1-jkoolstra%40xs4all.nl
patch subject: [PATCH] Add support for empty path in openat and openat2 syscalls
config: alpha-allnoconfig (https://download.01.org/0day-ci/archive/20260224/202602240038.MTqLbuRR-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260224/202602240038.MTqLbuRR-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/202602240038.MTqLbuRR-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   fs/fcntl.c: In function 'fcntl_init':
>> include/linux/compiler_types.h:705:45: error: call to '__compiletime_assert_393' declared with attribute error: BUILD_BUG_ON failed: 21 - 1 != HWEIGHT32( (VALID_OPEN_FLAGS & ~(O_NONBLOCK | O_NDELAY)) | __FMODE_EXEC)
     705 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:686:25: note: in definition of macro '__compiletime_assert'
     686 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:705:9: note: in expansion of macro '_compiletime_assert'
     705 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   fs/fcntl.c:1172:9: note: in expansion of macro 'BUILD_BUG_ON'
    1172 |         BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ !=
         |         ^~~~~~~~~~~~


vim +/__compiletime_assert_393 +705 include/linux/compiler_types.h

eb5c2d4b45e3d2d Will Deacon 2020-07-21  691  
eb5c2d4b45e3d2d Will Deacon 2020-07-21  692  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21  693  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2d Will Deacon 2020-07-21  694  
eb5c2d4b45e3d2d Will Deacon 2020-07-21  695  /**
eb5c2d4b45e3d2d Will Deacon 2020-07-21  696   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21  697   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2d Will Deacon 2020-07-21  698   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21  699   *
eb5c2d4b45e3d2d Will Deacon 2020-07-21  700   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21  701   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21  702   * compiler has support to do so.
eb5c2d4b45e3d2d Will Deacon 2020-07-21  703   */
eb5c2d4b45e3d2d Will Deacon 2020-07-21  704  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21 @705  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2d Will Deacon 2020-07-21  706  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki