Hi Thomas,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dcc0b49040c70ad827a7f3d58a21b01fdb14e749
commit: 39cac191ff37939544af80d5d2af6b870fd94c9b arc/mm/highmem: Use generic kmap atomic implementation
date:   3 months ago
config: arc-randconfig-r006-20210213 (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39cac191ff37939544af80d5d2af6b870fd94c9b
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 39cac191ff37939544af80d5d2af6b870fd94c9b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   arch/arc/mm/highmem.c: In function 'kmap_init':
>> include/linux/compiler_types.h:319:38: error: call to '__compiletime_assert_223' declared with attribute error: BUILD_BUG_ON failed: FIX_KMAP_SLOTS > PTRS_PER_PTE
     319 |  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                      ^
   include/linux/compiler_types.h:300:4: note: in definition of macro '__compiletime_assert'
     300 |    prefix ## suffix();    \
         |    ^~~~~~
   include/linux/compiler_types.h:319:2: note: in expansion of macro '_compiletime_assert'
     319 |  _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:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |  BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |  ^~~~~~~~~~~~~~~~
   arch/arc/mm/highmem.c:69:2: note: in expansion of macro 'BUILD_BUG_ON'
      69 |  BUILD_BUG_ON(FIX_KMAP_SLOTS > PTRS_PER_PTE);
         |  ^~~~~~~~~~~~


vim +/__compiletime_assert_223 +319 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  305  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  306  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  307  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  308  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  309  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  310   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  311   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  312   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  313   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  314   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  315   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  316   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  317   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  318  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @319  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  320  

:::::: The code at line 319 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, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org