Re: [PATCH v2 1/2] Introduce flexible array struct helpers

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

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Hi Kees,

I love your patch! Perhaps something to improve:

[auto build test WARNING on xfs-linux/for-next]
[also build test WARNING on kees/for-next/pstore drm-tip/drm-tip linus/master v6.1-rc2 next-20221025]
[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/Kees-Cook/Introduce-flexible-array-struct-helpers/20221025-031100
base:   https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git for-next
patch link:    https://lore.kernel.org/r/20221024172058.534477-1-keescook%40chromium.org
patch subject: [PATCH v2 1/2] Introduce flexible array struct helpers
config: arm-allyesconfig (attached as .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/04402c9f14fd381697b7aa744713a81aca0077cc
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kees-Cook/Introduce-flexible-array-struct-helpers/20221025-031100
        git checkout 04402c9f14fd381697b7aa744713a81aca0077cc
        # 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 SHELL=/bin/bash drivers/crypto/caam/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/string.h:259,
                    from include/linux/bitmap.h:11,
                    from include/linux/cpumask.h:12,
                    from include/linux/mm_types_task.h:14,
                    from include/linux/mm_types.h:5,
                    from include/linux/buildid.h:5,
                    from include/linux/module.h:14,
                    from drivers/crypto/caam/compat.h:10,
                    from drivers/crypto/caam/key_gen.c:8:
   drivers/crypto/caam/desc_constr.h: In function 'append_data.constprop':
>> include/linux/flex_array.h:9:33: warning: argument 2 null where non-null expected [-Wnonnull]
       9 | #define __underlying_memcpy     __builtin_memcpy
   include/linux/fortify-string.h:451:9: note: in expansion of macro '__underlying_memcpy'
     451 |         __underlying_##op(p, q, __fortify_size);                        \
         |         ^~~~~~~~~~~~~
   include/linux/fortify-string.h:496:26: note: in expansion of macro '__fortify_memcpy_chk'
     496 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
         |                          ^~~~~~~~~~~~~~~~~~~~
   drivers/crypto/caam/desc_constr.h:167:17: note: in expansion of macro 'memcpy'
     167 |                 memcpy(offset, data, len);
         |                 ^~~~~~
   include/linux/flex_array.h:9:33: note: in a call to built-in function '__builtin_memcpy'
       9 | #define __underlying_memcpy     __builtin_memcpy
   include/linux/fortify-string.h:451:9: note: in expansion of macro '__underlying_memcpy'
     451 |         __underlying_##op(p, q, __fortify_size);                        \
         |         ^~~~~~~~~~~~~
   include/linux/fortify-string.h:496:26: note: in expansion of macro '__fortify_memcpy_chk'
     496 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
         |                          ^~~~~~~~~~~~~~~~~~~~
   drivers/crypto/caam/desc_constr.h:167:17: note: in expansion of macro 'memcpy'
     167 |                 memcpy(offset, data, len);
         |                 ^~~~~~


vim +9 include/linux/flex_array.h

     6	
     7	/* Make sure we compose correctly with KASAN. */
     8	#ifndef __underlying_memcpy
   > 9	#define __underlying_memcpy     __builtin_memcpy
    10	#endif
    11	#ifndef __underlying_memset
    12	#define __underlying_memset	__builtin_memset
    13	#endif
    14	

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