[linux-next:master 5187/6333] arch/m68k/include/asm/string.h:53:25: warning: '__builtin_memcpy' offset [0, 2] is out of the bounds [0, 0]

[linux-next:master 5187/6333] arch/m68k/include/asm/string.h:53:25: warning: '__builtin_memcpy' offset [0, 2] is out of the bounds [0, 0]

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   29e400e3ea486bf942b214769fc9778098114113
commit: 0e2bdaccb10a440a7a451343e8347d29a874b58e [5187/6333] Bluetooth: hci_core: Fix build warnings
config: m68k-buildonly-randconfig-r002-20210930 (https://download.01.org/0day-ci/archive/20230919/202309191933.2FJx5yys-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230919/202309191933.2FJx5yys-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
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309191933.2FJx5yys-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/string.h:20,
                    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/spinlock.h:63,
                    from include/linux/wait.h:9,
                    from include/linux/poll.h:8,
                    from include/net/bluetooth/bluetooth.h:29,
                    from net/bluetooth/hci_event.c:30:
   In function 'hci_cc_read_class_of_dev',
       inlined from 'hci_cc_read_class_of_dev' at net/bluetooth/hci_event.c:511:11:
>> arch/m68k/include/asm/string.h:53:25: warning: '__builtin_memcpy' offset [0, 2] is out of the bounds [0, 0] [-Warray-bounds]
      53 | #define memcpy(d, s, n) __builtin_memcpy(d, s, n)
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
   net/bluetooth/hci_event.c:521:9: note: in expansion of macro 'memcpy'
     521 |         memcpy(hdev->dev_class, rp->dev_class, 3);
         |         ^~~~~~


vim +/__builtin_memcpy +53 arch/m68k/include/asm/string.h

ea61bc461d09e8 Greg Ungerer 2010-09-07  50  
ea61bc461d09e8 Greg Ungerer 2010-09-07  51  #define __HAVE_ARCH_MEMCPY
ea61bc461d09e8 Greg Ungerer 2010-09-07  52  extern void *memcpy(void *, const void *, __kernel_size_t);
ea61bc461d09e8 Greg Ungerer 2010-09-07 @53  #define memcpy(d, s, n) __builtin_memcpy(d, s, n)
ea61bc461d09e8 Greg Ungerer 2010-09-07  54  

:::::: The code at line 53 was first introduced by commit
:::::: ea61bc461d09e8d331a307916530aaae808c72a2 m68k/m68knommu: merge MMU and non-MMU string.h

:::::: TO: Greg Ungerer <gerg@snapgear.com>
:::::: CC: Geert Uytterhoeven <geert@linux-m68k.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [linux-next:master 5187/6333] arch/m68k/include/asm/string.h:53:25: warning: '__builtin_memcpy' offset [0, 2] is out of the bounds [0, 0]

[Christopher Kerr]

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