linux-kernel - [akpm-mm:mm-nonmm-unstable 36/41] include/linux/build_bug.h:16:51: error: negative width in bit-field '<anonymous>'

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Date:   Wed, 19 Oct 2022 01:27:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Jason A. Donenfeld" <zx2c4@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [akpm-mm:mm-nonmm-unstable 36/41] include/linux/build_bug.h:16:51:
 error: negative width in bit-field '<anonymous>'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
head:   c05e49b87cb71437bbc18a6c16dd8113623d7778
commit: 20b6f49e6024be96a0a729839f7a127600d08740 [36/41] minmax: sanity check constant bounds when clamping
config: arm-defconfig
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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/akpm/mm.git/commit/?id=20b6f49e6024be96a0a729839f7a127600d08740
        git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
        git fetch --no-tags akpm-mm mm-nonmm-unstable
        git checkout 20b6f49e6024be96a0a729839f7a127600d08740
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/net/wireless/ralink/rt2x00/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from include/linux/container_of.h:5,
                    from include/linux/kernel.h:21,
                    from drivers/net/wireless/ralink/rt2x00/rt2800lib.c:25:
   drivers/net/wireless/ralink/rt2x00/rt2800lib.c: In function 'rt2800_txpower_to_dev':
>> include/linux/build_bug.h:16:51: error: negative width in bit-field '<anonymous>'
      16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
         |                                                   ^
   include/linux/minmax.h:50:10: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
      50 |         (BUILD_BUG_ON_ZERO(__builtin_choose_expr(                               \
         |          ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:54:9: note: in expansion of macro '__clamp_input_check'
      54 |         __clamp_input_check(lo, hi) +                                           \
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:146:36: note: in expansion of macro '__careful_clamp'
     146 | #define clamp_t(type, val, lo, hi) __careful_clamp((type)(val), (type)(lo), (type)(hi))
         |                                    ^~~~~~~~~~~~~~~
   drivers/net/wireless/ralink/rt2x00/rt2800lib.c:4054:24: note: in expansion of macro 'clamp_t'
    4054 |                 return clamp_t(char, txpower, MIN_A_TXPOWER, MAX_A_TXPOWER);
         |                        ^~~~~~~


vim +16 include/linux/build_bug.h

bc6245e5efd70c41 Ian Abbott       2017-07-10   6  
bc6245e5efd70c41 Ian Abbott       2017-07-10   7  #ifdef __CHECKER__
bc6245e5efd70c41 Ian Abbott       2017-07-10   8  #define BUILD_BUG_ON_ZERO(e) (0)
bc6245e5efd70c41 Ian Abbott       2017-07-10   9  #else /* __CHECKER__ */
bc6245e5efd70c41 Ian Abbott       2017-07-10  10  /*
bc6245e5efd70c41 Ian Abbott       2017-07-10  11   * Force a compilation error if condition is true, but also produce a
8788994376d84d62 Rikard Falkeborn 2019-12-04  12   * result (of value 0 and type int), so the expression can be used
bc6245e5efd70c41 Ian Abbott       2017-07-10  13   * e.g. in a structure initializer (or where-ever else comma expressions
bc6245e5efd70c41 Ian Abbott       2017-07-10  14   * aren't permitted).
bc6245e5efd70c41 Ian Abbott       2017-07-10  15   */
8788994376d84d62 Rikard Falkeborn 2019-12-04 @16  #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
527edbc18a70e745 Masahiro Yamada  2019-01-03  17  #endif /* __CHECKER__ */
527edbc18a70e745 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@...il.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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