[kees:for-next/kspp 17/18] include/linux/compiler_types.h:572:45: error: call to '__compiletime_assert_246' declared with attribute error: BUILD_BUG_ON failed: init___fls < 32

[kees:for-next/kspp 17/18] include/linux/compiler_types.h:572:45: error: call to '__compiletime_assert_246' declared with attribute error: BUILD_BUG_ON failed: init___fls < 32

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/kspp
head:   6a38fe1a7d9c9eba3330a8ae4ece2fa5d0f628cc
commit: 159746fccb2e000bbac46fe24034d38e7df6c6e2 [17/18] KUnit: ffs: Validate all the __attribute_const__ annotations
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20250901/202509011237.Hf8MjkXU-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250901/202509011237.Hf8MjkXU-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/202509011237.Hf8MjkXU-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   lib/tests/ffs_kunit.c: In function 'build_test___fls.isra':
>> include/linux/compiler_types.h:572:45: error: call to '__compiletime_assert_246' declared with attribute error: BUILD_BUG_ON failed: init___fls < 32
     572 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:553:25: note: in definition of macro '__compiletime_assert'
     553 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:572:9: note: in expansion of macro '_compiletime_assert'
     572 |         _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)
         |         ^~~~~~~~~~~~~~~~
   lib/tests/ffs_kunit.c:510:9: note: in expansion of macro 'BUILD_BUG_ON'
     510 |         BUILD_BUG_ON(init_##func < 32);                                 \
         |         ^~~~~~~~~~~~
   lib/tests/ffs_kunit.c:521:1: note: in expansion of macro 'CREATE_WRAPPER'
     521 | CREATE_WRAPPER(__fls)
         | ^~~~~~~~~~~~~~


vim +/__compiletime_assert_246 +572 include/linux/compiler_types.h

eb5c2d4b45e3d2d Will Deacon 2020-07-21  558  
eb5c2d4b45e3d2d Will Deacon 2020-07-21  559  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21  560  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2d Will Deacon 2020-07-21  561  
eb5c2d4b45e3d2d Will Deacon 2020-07-21  562  /**
eb5c2d4b45e3d2d Will Deacon 2020-07-21  563   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21  564   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2d Will Deacon 2020-07-21  565   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21  566   *
eb5c2d4b45e3d2d Will Deacon 2020-07-21  567   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21  568   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21  569   * compiler has support to do so.
eb5c2d4b45e3d2d Will Deacon 2020-07-21  570   */
eb5c2d4b45e3d2d Will Deacon 2020-07-21  571  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21 @572  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2d Will Deacon 2020-07-21  573  

:::::: The code at line 572 was first introduced by commit
:::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h

:::::: TO: Will Deacon <will@kernel.org>
:::::: CC: Will Deacon <will@kernel.org>

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

Re: [kees:for-next/kspp 17/18] include/linux/compiler_types.h:572:45: error: call to '__compiletime_assert_246' declared with attribute error: BUILD_BUG_ON failed: init___fls < 32

[Kees Cook]

On Mon, Sep 01, 2025 at 12:49:17PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/kspp
> head:   6a38fe1a7d9c9eba3330a8ae4ece2fa5d0f628cc
> commit: 159746fccb2e000bbac46fe24034d38e7df6c6e2 [17/18] KUnit: ffs: Validate all the __attribute_const__ annotations
> config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20250901/202509011237.Hf8MjkXU-lkp@intel.com/config)
> compiler: arc-linux-gcc (GCC) 15.1.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250901/202509011237.Hf8MjkXU-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/202509011237.Hf8MjkXU-lkp@intel.com/

This should be fixed now:
https://lore.kernel.org/all/20250831022352.it.055-kees@kernel.org/

Thanks!

-Kees

-- 
Kees Cook