Re: [PATCH] Staging: nvec: Change container_of 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-Change-container_of-macro-to-an-inline-function/20230319-010628
patch link:    https://lore.kernel.org/r/20230318170514.GA49181%40sumitra.com
patch subject: [PATCH] Staging: nvec: Change container_of macro to an inline function.
config: arm64-randconfig-r014-20230319 (https://download.01.org/0day-ci/archive/20230319/202303190233.v2KJFmIG-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/e58807d27f0ba705144bce72751f5cb0a75b9682
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sumitra-Sharma/Staging-nvec-Change-container_of-macro-to-an-inline-function/20230319-010628
        git checkout e58807d27f0ba705144bce72751f5cb0a75b9682
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/staging/nvec/

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/202303190233.v2KJFmIG-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/staging/nvec/nvec_paz00.c:19:9: error: incomplete definition of type 'struct nvec_led'
           return container_of(led_cdev, struct nvec_led, cdev);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/container_of.h:20:47: note: expanded from macro 'container_of'
           static_assert(__same_type(*(ptr), ((type *)0)->member) ||       \
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:338:74: note: expanded from macro '__same_type'
   #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
                                                                            ^
   include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert'
   #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
                                    ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert'
   #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
                                                          ^~~~
   drivers/staging/nvec/nvec_paz00.c:17:22: note: forward declaration of 'struct nvec_led'
   static inline struct nvec_led *to_nvec_led(struct led_classdev *led_cdev)
                        ^
>> drivers/staging/nvec/nvec_paz00.c:19:9: error: offsetof of incomplete type 'struct nvec_led'
           return container_of(led_cdev, struct nvec_led, cdev);
                  ^                      ~~~~~~
   include/linux/container_of.h:23:21: note: expanded from macro 'container_of'
           ((type *)(__mptr - offsetof(type, member))); })
                              ^        ~~~~
   include/linux/stddef.h:16:32: note: expanded from macro 'offsetof'
   #define offsetof(TYPE, MEMBER)  __builtin_offsetof(TYPE, MEMBER)
                                   ^                  ~~~~
   drivers/staging/nvec/nvec_paz00.c:17:22: note: forward declaration of 'struct nvec_led'
   static inline struct nvec_led *to_nvec_led(struct led_classdev *led_cdev)
                        ^
>> drivers/staging/nvec/nvec_paz00.c:19:9: error: returning 'void' from a function with incompatible result type 'struct nvec_led *'
           return container_of(led_cdev, struct nvec_led, cdev);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/container_of.h:18:41: note: expanded from macro 'container_of'
   #define container_of(ptr, type, member) ({                              \
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   3 errors generated.


vim +19 drivers/staging/nvec/nvec_paz00.c

    16	
    17	static inline struct nvec_led *to_nvec_led(struct led_classdev *led_cdev)
    18	{
  > 19		return container_of(led_cdev, struct nvec_led, cdev);
    20	}
    21	

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