tree: git://git.infradead.org/users/hch/misc.git set_fs-removal head: 8783f2261aa42693c0e738e22036228c2b26d782 commit: 1d7ac476a3ca018b4c1dc83615cae3e0693e0d71 [80/83] powerpc: remove address space overrides using set_fs() config: powerpc-allnoconfig (attached as .config) compiler: powerpc-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 git checkout 1d7ac476a3ca018b4c1dc83615cae3e0693e0d71 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 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 >>, old ones prefixed by <<): In file included from include/linux/uaccess.h:9, from include/linux/crypto.h:21, from include/crypto/hash.h:11, from include/linux/uio.h:10, from include/linux/socket.h:8, from include/linux/compat.h:15, from arch/powerpc/kernel/asm-offsets.c:14: arch/powerpc/include/asm/uaccess.h: In function '__access_ok': 28 | if (addr > seg.seg) | ^~~ | sem arch/powerpc/include/asm/uaccess.h:28:13: note: each undeclared identifier is reported only once for each function it appears in make[2]: *** [scripts/Makefile.build:114: arch/powerpc/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1175: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:185: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +28 arch/powerpc/include/asm/uaccess.h 2df5e8bcca53e5 include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 24 ef85dffd4251ff arch/powerpc/include/asm/uaccess.h Mathieu Malaterre 2018-03-02 25 static inline int __access_ok(unsigned long addr, unsigned long size, 1d7ac476a3ca01 arch/powerpc/include/asm/uaccess.h Christoph Hellwig 2020-06-11 26 unsigned long limit) ef85dffd4251ff arch/powerpc/include/asm/uaccess.h Mathieu Malaterre 2018-03-02 27 { ef85dffd4251ff arch/powerpc/include/asm/uaccess.h Mathieu Malaterre 2018-03-02 @28 if (addr > seg.seg) ef85dffd4251ff arch/powerpc/include/asm/uaccess.h Mathieu Malaterre 2018-03-02 29 return 0; 1d7ac476a3ca01 arch/powerpc/include/asm/uaccess.h Christoph Hellwig 2020-06-11 30 return (size == 0 || size - 1 <= limit - addr); ef85dffd4251ff arch/powerpc/include/asm/uaccess.h Mathieu Malaterre 2018-03-02 31 } 2df5e8bcca53e5 include/asm-powerpc/uaccess.h Stephen Rothwell 2005-10-29 32 :::::: The code at line 28 was first introduced by commit :::::: ef85dffd4251ff6c23056651f6f83bdce83cd1cf powerpc: Avoid comparison of unsigned long >= 0 in __access_ok() :::::: TO: Mathieu Malaterre <malat(a)debian.org&gt; :::::: CC: Michael Ellerman <mpe(a)ellerman.id.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org