tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 07a56bb875afbe39dabbf6ba7b83783d166863db commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 4 weeks ago config: mips-randconfig-s031-20200717 (attached as .config) compiler: mipsel-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-49-g707c5017-dirty git checkout 670d0a4b10704667765f7d18f7592993d02783aa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) arch/mips/ralink/bootrom.c:17:22: sparse: expected void const *data vim +17 arch/mips/ralink/bootrom.c 7a1a44c909fcb4 John Crispin 2013-05-21 14 7a1a44c909fcb4 John Crispin 2013-05-21 15 static int bootrom_show(struct seq_file *s, void *unused) 7a1a44c909fcb4 John Crispin 2013-05-21 16 { 7a1a44c909fcb4 John Crispin 2013-05-21 @17 seq_write(s, membase, BOOTROM_SIZE); 7a1a44c909fcb4 John Crispin 2013-05-21 18 7a1a44c909fcb4 John Crispin 2013-05-21 19 return 0; 7a1a44c909fcb4 John Crispin 2013-05-21 20 } 7a1a44c909fcb4 John Crispin 2013-05-21 21 :::::: The code at line 17 was first introduced by commit :::::: 7a1a44c909fcb4707b01448a28490d7be366b530 MIPS: ralink: add a bootrom dumper module :::::: TO: John Crispin <blogic(a)openwrt.org&gt; :::::: CC: Ralf Baechle <ralf(a)linux-mips.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org