Hi Arnd,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   8702f95941c215501826ea8743a8b64b83479209
commit: 0652035a57945e14e611dafae2ec5b46a05bc1d1 [1088/13550] asm-generic: unaligned: remove byteshift helpers
config: mips-randconfig-r013-20210625 (attached as .config)
compiler: mips64-linux-gcc (GCC) 9.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=0652035a57945e14e611dafae2ec5b46a05bc1d1
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 0652035a57945e14e611dafae2ec5b46a05bc1d1
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

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

All errors (new ones prefixed by >>):

   mips64-linux-ld: arch/mips/boot/compressed/decompress.o: in function `decompress_kernel':
>> decompress.c:(.text.decompress_kernel+0x54): undefined reference to `__bswapsi2'
>> mips64-linux-ld: decompress.c:(.text.decompress_kernel+0x80): undefined reference to `__bswapsi2'
   mips64-linux-ld: decompress.c:(.text.decompress_kernel+0x9c): undefined reference to `__bswapsi2'
   mips64-linux-ld: decompress.c:(.text.decompress_kernel+0xe8): undefined reference to `__bswapsi2'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org