Re: [PATCH v2] Staging: nvec: Convert to_nvec_led from a macro to an inline function

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

Hi Sumitra,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/intel-lab-lkp/linux/commits/Sumitra-Sharma/Staging-nvec-Convert-to_nvec_led-from-a-macro-to-an-inline-function/20230319-015434
patch link:    https://lore.kernel.org/r/20230318175250.GA49618%40sumitra.com
patch subject: [PATCH v2] Staging: nvec: Convert to_nvec_led from a macro to an inline function
config: arm-allyesconfig (https://download.01.org/0day-ci/archive/20230320/202303202327.ojGuSQqT-lkp@intel.com/config)
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://github.com/intel-lab-lkp/linux/commit/5bb6b930cab3ac631310d3bbf40c9decf91dfd38
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sumitra-Sharma/Staging-nvec-Convert-to_nvec_led-from-a-macro-to-an-inline-function/20230319-015434
        git checkout 5bb6b930cab3ac631310d3bbf40c9decf91dfd38
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/staging/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303202327.ojGuSQqT-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/container_of.h:5,
                    from include/linux/list.h:5,
                    from include/linux/module.h:12,
                    from drivers/staging/nvec/nvec_paz00.c:10:
   drivers/staging/nvec/nvec_paz00.c: In function 'to_nvec_led':
>> include/linux/container_of.h:20:54: error: invalid use of undefined type 'struct nvec_led'
      20 |         static_assert(__same_type(*(ptr), ((type *)0)->member) ||       \
         |                                                      ^~
   include/linux/build_bug.h:78:56: note: in definition of macro '__static_assert'
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                                        ^~~~
   include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
      20 |         static_assert(__same_type(*(ptr), ((type *)0)->member) ||       \
         |         ^~~~~~~~~~~~~
   include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
      20 |         static_assert(__same_type(*(ptr), ((type *)0)->member) ||       \
         |                       ^~~~~~~~~~~
   drivers/staging/nvec/nvec_paz00.c:19:16: note: in expansion of macro 'container_of'
      19 |         return container_of(led_cdev, struct nvec_led, cdev);
         |                ^~~~~~~~~~~~
   include/linux/compiler_types.h:338:27: error: expression in static assertion is not an integer
     338 | #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:78:56: note: in definition of macro '__static_assert'
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                                        ^~~~
   include/linux/container_of.h:20:9: note: in expansion of macro 'static_assert'
      20 |         static_assert(__same_type(*(ptr), ((type *)0)->member) ||       \
         |         ^~~~~~~~~~~~~
   include/linux/container_of.h:20:23: note: in expansion of macro '__same_type'
      20 |         static_assert(__same_type(*(ptr), ((type *)0)->member) ||       \
         |                       ^~~~~~~~~~~
   drivers/staging/nvec/nvec_paz00.c:19:16: note: in expansion of macro 'container_of'
      19 |         return container_of(led_cdev, struct nvec_led, cdev);
         |                ^~~~~~~~~~~~
   In file included from include/uapi/linux/posix_types.h:5,
                    from include/uapi/linux/types.h:14,
                    from include/linux/types.h:6,
                    from include/linux/kasan-checks.h:5,
                    from include/asm-generic/rwonce.h:26,
                    from ./arch/arm/include/generated/asm/rwonce.h:1,
                    from include/linux/compiler.h:247,
                    from include/linux/build_bug.h:5:
>> include/linux/stddef.h:16:33: error: invalid use of undefined type 'struct nvec_led'
      16 | #define offsetof(TYPE, MEMBER)  __builtin_offsetof(TYPE, MEMBER)
         |                                 ^~~~~~~~~~~~~~~~~~
   include/linux/container_of.h:23:28: note: in expansion of macro 'offsetof'
      23 |         ((type *)(__mptr - offsetof(type, member))); })
         |                            ^~~~~~~~
   drivers/staging/nvec/nvec_paz00.c:19:16: note: in expansion of macro 'container_of'
      19 |         return container_of(led_cdev, struct nvec_led, cdev);
         |                ^~~~~~~~~~~~
   drivers/staging/nvec/nvec_paz00.c:20:1: error: control reaches end of non-void function [-Werror=return-type]
      20 | }
         | ^
   cc1: some warnings being treated as errors


vim +20 include/linux/container_of.h

d2a8ebbf8192b8 Andy Shevchenko  2021-11-08   9  
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  10  /**
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  11   * container_of - cast a member of a structure out to the containing structure
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  12   * @ptr:	the pointer to the member.
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  13   * @type:	the type of the container struct this is embedded in.
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  14   * @member:	the name of the member within the struct.
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  15   *
7376e561fd2e01 Sakari Ailus     2022-10-24  16   * WARNING: any const qualifier of @ptr is lost.
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  17   */
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  18  #define container_of(ptr, type, member) ({				\
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  19  	void *__mptr = (void *)(ptr);					\
e1edc277e6f6df Rasmus Villemoes 2021-11-08 @20  	static_assert(__same_type(*(ptr), ((type *)0)->member) ||	\
e1edc277e6f6df Rasmus Villemoes 2021-11-08  21  		      __same_type(*(ptr), void),			\
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  22  		      "pointer type mismatch in container_of()");	\
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  23  	((type *)(__mptr - offsetof(type, member))); })
d2a8ebbf8192b8 Andy Shevchenko  2021-11-08  24  

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