Hi Boris, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 3d5895cd351757f69c9a66fb5fc8cf19f454d773 commit: ef45fe470e1e5410db4af87abc5d5055427945ac blk-cgroup: show global disk stats in root cgroup io.stat date: 1 year ago config: mips-buildonly-randconfig-r003-20210721 (attached as .config) compiler: mips-linux-gcc (GCC) 10.3.0 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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout ef45fe470e1e5410db4af87abc5d5055427945ac # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=mips SHELL=/bin/bash crypto/async_tx/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 44 | static char disk_type(int d, int disks) | ^~~~~~~~~ In file included from arch/mips/include/asm/mach-rc32434/rb.h:10, from arch/mips/include/asm/mach-rc32434/irq.h:8, from arch/mips/include/asm/irq.h:18, from include/linux/irq.h:23, from include/asm-generic/hardirq.h:13, from arch/mips/include/asm/hardirq.h:16, from include/linux/hardirq.h:10, from include/linux/interrupt.h:11, from include/linux/async_tx.h:9, from crypto/async_tx/raid6test.c:9: include/linux/genhd.h:27:33: note: previous declaration of 'disk_type' was here 27 | extern const struct device_type disk_type; | ^~~~~~~~~ vim +/disk_type +44 crypto/async_tx/raid6test.c cb3c82992f62f8 Dan Williams 2009-07-14 43 cb3c82992f62f8 Dan Williams 2009-07-14 @44 static char disk_type(int d, int disks) cb3c82992f62f8 Dan Williams 2009-07-14 45 { cb3c82992f62f8 Dan Williams 2009-07-14 46 if (d == disks - 2) cb3c82992f62f8 Dan Williams 2009-07-14 47 return 'P'; cb3c82992f62f8 Dan Williams 2009-07-14 48 else if (d == disks - 1) cb3c82992f62f8 Dan Williams 2009-07-14 49 return 'Q'; cb3c82992f62f8 Dan Williams 2009-07-14 50 else cb3c82992f62f8 Dan Williams 2009-07-14 51 return 'D'; cb3c82992f62f8 Dan Williams 2009-07-14 52 } cb3c82992f62f8 Dan Williams 2009-07-14 53 :::::: The code at line 44 was first introduced by commit :::::: cb3c82992f62f838e6476a0bff12909158007fc6 async_tx: raid6 recovery self test :::::: TO: Dan Williams <dan.j.williams(a)intel.com&gt; :::::: CC: Dan Williams <dan.j.williams(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org