include/linux/compiler.h:200:82: error: expression in static assertion is not an integer

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

Hi Rosen,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6812ce4e4379ffc99c52401ec28f0d7ffbc36206
commit: 4d105880666ab7f7914a75716d3e95b0d8b879dc tty: serial: mpc52xx_uart: add bounds check for psc_num array index
date:   3 months ago
config: powerpc-randconfig-r2101-20260926 (https://download.01.org/0day-ci/archive/20260926/202609260356.tJWbd1WU-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260926/202609260356.tJWbd1WU-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
| Fixes: 4d105880666a ("tty: serial: mpc52xx_uart: add bounds check for psc_num array index")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609260356.tJWbd1WU-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/kernel.h:16,
                    from arch/powerpc/include/asm/page.h:11,
                    from arch/powerpc/include/asm/thread_info.h:13,
                    from include/linux/thread_info.h:62,
                    from arch/powerpc/include/asm/processor.h:41,
                    from include/linux/sched.h:13,
                    from include/linux/ratelimit.h:6,
                    from include/linux/dev_printk.h:16,
                    from include/linux/device.h:15,
                    from drivers/tty/serial/mpc52xx_uart.c:31:
   drivers/tty/serial/mpc52xx_uart.c: In function 'mpc512x_psc_handle_irq':
   drivers/tty/serial/mpc52xx_uart.c:648:35: error: 'psc_mclk_clk' undeclared (first use in this function)
     648 |         if (psc_num >= ARRAY_SIZE(psc_mclk_clk))
         |                                   ^~~~~~~~~~~~
   include/linux/array_size.h:11:33: note: in definition of macro 'ARRAY_SIZE'
      11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
         |                                 ^~~
   drivers/tty/serial/mpc52xx_uart.c:648:35: note: each undeclared identifier is reported only once for each function it appears in
     648 |         if (psc_num >= ARRAY_SIZE(psc_mclk_clk))
         |                                   ^~~~~~~~~~~~
   include/linux/array_size.h:11:33: note: in definition of macro 'ARRAY_SIZE'
      11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
         |                                 ^~~
   In file included from include/linux/dev_printk.h:14:
>> include/linux/compiler.h:200:82: error: expression in static assertion is not an integer
     200 | #define __BUILD_BUG_ON_ZERO_MSG(e, msg, ...) ((int)sizeof(struct {_Static_assert(!(e), msg);}))
         |                                                                                  ^
   include/linux/compiler.h:205:33: note: in expansion of macro '__BUILD_BUG_ON_ZERO_MSG'
     205 | #define __must_be_array(a)      __BUILD_BUG_ON_ZERO_MSG(!__is_array(a), \
         |                                 ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/array_size.h:11:59: note: in expansion of macro '__must_be_array'
      11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
         |                                                           ^~~~~~~~~~~~~~~
   drivers/tty/serial/mpc52xx_uart.c:648:24: note: in expansion of macro 'ARRAY_SIZE'
     648 |         if (psc_num >= ARRAY_SIZE(psc_mclk_clk))
         |                        ^~~~~~~~~~


vim +200 include/linux/compiler.h

230fa253df6352 Christian Borntraeger 2014-11-25  196  
cb7380de9e4cbc Kees Cook             2025-02-05  197  #ifdef __CHECKER__
243c90e917f5cf Vincent Mailhol       2025-03-29  198  #define __BUILD_BUG_ON_ZERO_MSG(e, msg, ...) (0)
cb7380de9e4cbc Kees Cook             2025-02-05  199  #else /* __CHECKER__ */
243c90e917f5cf Vincent Mailhol       2025-03-29 @200  #define __BUILD_BUG_ON_ZERO_MSG(e, msg, ...) ((int)sizeof(struct {_Static_assert(!(e), msg);}))
cb7380de9e4cbc Kees Cook             2025-02-05  201  #endif /* __CHECKER__ */
cb7380de9e4cbc Kees Cook             2025-02-05  202  

:::::: The code at line 200 was first introduced by commit
:::::: 243c90e917f5cfc99821e5104d1c8a81c11cda4c build_bug.h: more user friendly error messages in BUILD_BUG_ON_ZERO()

:::::: TO: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
:::::: CC: Yury Norov <yury.norov@gmail.com>

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