Re: [PATCH v1] gpio: gpiolib: clear the array_info's memory space

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

Hi Yan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on brgl/gpio/for-next]
[also build test WARNING on next-20230421]
[cannot apply to linus/master v6.3-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yan-Wang/gpio-gpiolib-clear-the-array_info-s-memory-space/20230423-190500
base:   https://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git gpio/for-next
patch link:    https://lore.kernel.org/r/KL1PR01MB54489B7A3D9D02D242B4BDA1E6669%40KL1PR01MB5448.apcprd01.prod.exchangelabs.com
patch subject: [PATCH v1] gpio: gpiolib: clear the array_info's memory space
config: arm-randconfig-r046-20230423 (https://download.01.org/0day-ci/archive/20230423/202304232025.QmaYH1Ov-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/061c9f6937fab64a9c1d051252fcd3236a35381f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Yan-Wang/gpio-gpiolib-clear-the-array_info-s-memory-space/20230423-190500
        git checkout 061c9f6937fab64a9c1d051252fcd3236a35381f
        # 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/gpio/

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/202304232025.QmaYH1Ov-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/string.h:254,
                    from include/linux/bitmap.h:11,
                    from include/linux/cpumask.h:12,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/mutex.h:17,
                    from include/linux/kernfs.h:11,
                    from include/linux/sysfs.h:16,
                    from include/linux/kobject.h:20,
                    from include/linux/of.h:17,
                    from include/linux/irqdomain.h:36,
                    from include/linux/acpi.h:13,
                    from drivers/gpio/gpiolib.c:3:
   drivers/gpio/gpiolib.c: In function 'gpiod_get_array':
>> include/linux/fortify-string.h:59:33: warning: argument 1 null where non-null expected [-Wnonnull]
      59 | #define __underlying_memset     __builtin_memset
         |                                 ^
   include/linux/fortify-string.h:453:9: note: in expansion of macro '__underlying_memset'
     453 |         __underlying_memset(p, c, __fortify_size);                      \
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/fortify-string.h:461:25: note: in expansion of macro '__fortify_memset_chk'
     461 | #define memset(p, c, s) __fortify_memset_chk(p, c, s,                   \
         |                         ^~~~~~~~~~~~~~~~~~~~
   drivers/gpio/gpiolib.c:4345:25: note: in expansion of macro 'memset'
    4345 |                         memset(array_info, 0, sizeof(struct gpio_array));
         |                         ^~~~~~
   include/linux/fortify-string.h:59:33: note: in a call to built-in function '__builtin_memset'
      59 | #define __underlying_memset     __builtin_memset
         |                                 ^
   include/linux/fortify-string.h:453:9: note: in expansion of macro '__underlying_memset'
     453 |         __underlying_memset(p, c, __fortify_size);                      \
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/fortify-string.h:461:25: note: in expansion of macro '__fortify_memset_chk'
     461 | #define memset(p, c, s) __fortify_memset_chk(p, c, s,                   \
         |                         ^~~~~~~~~~~~~~~~~~~~
   drivers/gpio/gpiolib.c:4345:25: note: in expansion of macro 'memset'
    4345 |                         memset(array_info, 0, sizeof(struct gpio_array));
         |                         ^~~~~~


vim +59 include/linux/fortify-string.h

78a498c3a227f2 Alexander Potapenko 2022-10-24  46  
78a498c3a227f2 Alexander Potapenko 2022-10-24  47  #if defined(__SANITIZE_MEMORY__)
78a498c3a227f2 Alexander Potapenko 2022-10-24  48  /*
78a498c3a227f2 Alexander Potapenko 2022-10-24  49   * For KMSAN builds all memcpy/memset/memmove calls should be replaced by the
78a498c3a227f2 Alexander Potapenko 2022-10-24  50   * corresponding __msan_XXX functions.
78a498c3a227f2 Alexander Potapenko 2022-10-24  51   */
78a498c3a227f2 Alexander Potapenko 2022-10-24  52  #include <linux/kmsan_string.h>
78a498c3a227f2 Alexander Potapenko 2022-10-24  53  #define __underlying_memcpy	__msan_memcpy
78a498c3a227f2 Alexander Potapenko 2022-10-24  54  #define __underlying_memmove	__msan_memmove
78a498c3a227f2 Alexander Potapenko 2022-10-24  55  #define __underlying_memset	__msan_memset
78a498c3a227f2 Alexander Potapenko 2022-10-24  56  #else
a28a6e860c6cf2 Francis Laniel      2021-02-25  57  #define __underlying_memcpy	__builtin_memcpy
a28a6e860c6cf2 Francis Laniel      2021-02-25  58  #define __underlying_memmove	__builtin_memmove
a28a6e860c6cf2 Francis Laniel      2021-02-25 @59  #define __underlying_memset	__builtin_memset
78a498c3a227f2 Alexander Potapenko 2022-10-24  60  #endif
78a498c3a227f2 Alexander Potapenko 2022-10-24  61  

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