linux-kernel - include/linux/bits.h:25:28: error: first argument to '__builtin_choose

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Date:   Mon, 28 Nov 2022 23:27:35 +0800
From:   kernel test robot <lkp@...el.com>
To:     Rikard Falkeborn <rikard.falkeborn@...il.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>
Subject: include/linux/bits.h:25:28: error: first argument to
 '__builtin_choose_expr' not a constant

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b7b275e60bcd5f89771e865a8239325f86d9927d
commit: 295bcca84916cb5079140a89fccb472bb8d1f6e2 linux/bits.h: add compile time sanity check of GENMASK inputs
date:   2 years, 8 months ago
config: s390-randconfig-r035-20221128
compiler: s390-linux-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/torvalds/linux.git/commit/?id=295bcca84916cb5079140a89fccb472bb8d1f6e2
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 295bcca84916cb5079140a89fccb472bb8d1f6e2
        # 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=s390 SHELL=/bin/bash drivers/

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 >>):

   drivers/mux/mmio.c: In function 'mux_mmio_probe':
   drivers/mux/mmio.c:76:34: error: storage size of 'field' isn't known
      76 |                 struct reg_field field;
         |                                  ^~~~~
   In file included from include/linux/bits.h:23,
                    from include/linux/bitops.h:5,
                    from drivers/mux/mmio.c:8:
>> include/linux/bits.h:25:28: error: first argument to '__builtin_choose_expr' not a constant
      25 |         (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
         |                            ^~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
      16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
         |                                                              ^
   include/linux/bits.h:39:10: note: in expansion of macro 'GENMASK_INPUT_CHECK'
      39 |         (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
         |          ^~~~~~~~~~~~~~~~~~~
   drivers/mux/mmio.c:96:29: note: in expansion of macro 'GENMASK'
      96 |                 if (mask != GENMASK(field.msb, field.lsb)) {
         |                             ^~~~~~~
   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/bits.h:25:10: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
      25 |         (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
         |          ^~~~~~~~~~~~~~~~~
   include/linux/bits.h:39:10: note: in expansion of macro 'GENMASK_INPUT_CHECK'
      39 |         (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
         |          ^~~~~~~~~~~~~~~~~~~
   drivers/mux/mmio.c:96:29: note: in expansion of macro 'GENMASK'
      96 |                 if (mask != GENMASK(field.msb, field.lsb)) {
         |                             ^~~~~~~
   drivers/mux/mmio.c:102:29: error: implicit declaration of function 'devm_regmap_field_alloc' [-Werror=implicit-function-declaration]
     102 |                 fields[i] = devm_regmap_field_alloc(dev, regmap, field);
         |                             ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/mux/mmio.c:76:34: warning: unused variable 'field' [-Wunused-variable]
      76 |                 struct reg_field field;
         |                                  ^~~~~
   cc1: some warnings being treated as errors


vim +/__builtin_choose_expr +25 include/linux/bits.h

    15	
    16	/*
    17	 * Create a contiguous bitmask starting at bit position @l and ending at
    18	 * position @h. For example
    19	 * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
    20	 */
    21	#if !defined(__ASSEMBLY__) && \
    22		(!defined(CONFIG_CC_IS_GCC) || CONFIG_GCC_VERSION >= 49000)
    23	#include <linux/build_bug.h>
    24	#define GENMASK_INPUT_CHECK(h, l) \
  > 25		(BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
    26			__builtin_constant_p((l) > (h)), (l) > (h), 0)))
    27	#else
    28	/*
    29	 * BUILD_BUG_ON_ZERO is not available in h files included from asm files,
    30	 * disable the input check if that is the case.
    31	 */
    32	#define GENMASK_INPUT_CHECK(h, l) 0
    33	#endif
    34	

-- 
0-DAY CI Kernel Test Service
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