[m68k:master 1174/1174] arch/m68k/include/asm/string.h:72:25: warning: '__builtin_memcpy' forming offset 8 is out of the bounds [0, 7]

[kbuild test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git master
head:   e223cadc191661c67cb419b3a53c7854ecc39e8b
commit: e223cadc191661c67cb419b3a53c7854ecc39e8b [1174/1174] Merge tag 'v5.0'
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gnu-gcc (Debian 8.2.0-11) 8.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout e223cadc191661c67cb419b3a53c7854ecc39e8b
        # save the attached .config to linux build tree
        GCC_VERSION=8.2.0 make.cross ARCH=m68k 

All warnings (new ones prefixed by >>):

   In file included from include/linux/string.h:20,
                    from include/linux/bitmap.h:9,
                    from include/linux/nodemask.h:95,
                    from include/linux/mmzone.h:17,
                    from include/linux/gfp.h:6,
                    from include/linux/umh.h:4,
                    from include/linux/kmod.h:22,
                    from include/linux/module.h:13,
                    from drivers/nvme/target/admin-cmd.c:15:
   In function 'memcpy_and_pad',
       inlined from 'nvmet_execute_identify_ctrl' at drivers/nvme/target/admin-cmd.c:309:2:
> > arch/m68k/include/asm/string.h:72:25: warning: '__builtin_memcpy' forming offset 8 is out of the bounds [0, 7] [-Warray-bounds]
    #define memcpy(d, s, n) __builtin_memcpy(d, s, n)
                            ^~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/string.h:456:3: note: in expansion of macro 'memcpy'
      memcpy(dest, src, dest_len);
      ^~~~~~

vim +/__builtin_memcpy +72 arch/m68k/include/asm/string.h

ea61bc46 Greg Ungerer 2010-09-07  69  
ea61bc46 Greg Ungerer 2010-09-07  70  #define __HAVE_ARCH_MEMCPY
ea61bc46 Greg Ungerer 2010-09-07  71  extern void *memcpy(void *, const void *, __kernel_size_t);
ea61bc46 Greg Ungerer 2010-09-07 @72  #define memcpy(d, s, n) __builtin_memcpy(d, s, n)
ea61bc46 Greg Ungerer 2010-09-07  73  

:::::: The code at line 72 was first introduced by commit
:::::: ea61bc461d09e8d331a307916530aaae808c72a2 m68k/m68knommu: merge MMU and non-MMU string.h

:::::: TO: Greg Ungerer <gerg@xxxxxxxxxxxx>
:::::: CC: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

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