tree: git://git.infradead.org/users/hch/misc.git set_fs-removal head: c303c53544a4cea226bd0eca686edc71b65d701e commit: d9916e81adce4a67f4c5fd01bbcc0ab1ff3b19c9 [14/21] uaccess: add infrastructure for kernel builds with set_fs() config: riscv-randconfig-r031-20200808 (attached as .config) compiler: riscv64-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 d9916e81adce4a67f4c5fd01bbcc0ab1ff3b19c9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): In file included from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/ptrace.h:7, from arch/riscv/kernel/process.c:15: include/linux/uaccess.h:11:20: warning: extra tokens at end of #ifdef directive 11 | #ifdef CONFIG_SET_FЅ | ^ include/linux/uaccess.h:32:3: error: conflicting types for 'mm_segment_t' 32 | } mm_segment_t; | ^~~~~~~~~~~~ In file included from include/linux/thread_info.h:38, from include/asm-generic/preempt.h:5, from ./arch/riscv/include/generated/asm/preempt.h:1, from include/linux/preempt.h:78, from include/linux/rcupdate.h:27, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:14, from include/linux/ratelimit.h:6, from include/linux/dev_printk.h:16, from include/linux/device.h:15, from include/linux/node.h:18, from include/linux/cpu.h:17, from arch/riscv/kernel/process.c:10: arch/riscv/include/asm/thread_info.h:29:3: note: previous declaration of 'mm_segment_t' was here 29 | } mm_segment_t; | ^~~~~~~~~~~~ In file included from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/ptrace.h:7, from arch/riscv/kernel/process.c:15: include/linux/uaccess.h:34: warning: "uaccess_kernel" redefined 34 | #define uaccess_kernel() (false) | In file included from arch/riscv/include/asm/uaccess.h:480, from include/linux/uaccess.h:9, from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/ptrace.h:7, from arch/riscv/kernel/process.c:15: include/asm-generic/uaccess.h:90: note: this is the location of the previous definition 90 | #define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg) | arch/riscv/kernel/process.c:42:6: warning: no previous prototype for 'show_regs' [-Wmissing-prototypes] 42 | void show_regs(struct pt_regs *regs) | ^~~~~~~~~ In file included from arch/riscv/include/asm/uaccess.h:480, from include/linux/uaccess.h:9, from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/ptrace.h:7, from arch/riscv/kernel/process.c:15: arch/riscv/kernel/process.c: In function 'start_thread': 70 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | ^ include/asm-generic/uaccess.h:77:18: note: in expansion of macro 'MAKE_MM_SEG' 77 | #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) | ^~~~~~~~~~~ arch/riscv/kernel/process.c:87:9: note: in expansion of macro 'USER_DS' 87 | set_fs(USER_DS); | ^~~~~~~ include/asm-generic/uaccess.h:70:42: note: (near initialization for '(anonymous)') 70 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | ^ include/asm-generic/uaccess.h:77:18: note: in expansion of macro 'MAKE_MM_SEG' 77 | #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) | ^~~~~~~~~~~ arch/riscv/kernel/process.c:87:9: note: in expansion of macro 'USER_DS' 87 | set_fs(USER_DS); | ^~~~~~~ 70 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | ^~~~~~~~~~~~~~~~~~~~~~~~ | | | mm_segment_t {aka struct <anonymous>} include/asm-generic/uaccess.h:77:18: note: in expansion of macro 'MAKE_MM_SEG' 77 | #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) | ^~~~~~~~~~~ arch/riscv/kernel/process.c:87:9: note: in expansion of macro 'USER_DS' 87 | set_fs(USER_DS); | ^~~~~~~ include/asm-generic/uaccess.h:83:40: note: expected 'mm_segment_t' {aka 'struct <anonymous>'} but argument is of type 'mm_segment_t' {aka 'struct <anonymous>'} 83 | static inline void set_fs(mm_segment_t fs) | ~~~~~~~~~~~~~^~ arch/riscv/kernel/process.c: At top level: arch/riscv/kernel/process.c:103:5: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes] 103 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) | ^~~~~~~~~~~~~~~~~~~~ vim +/set_fs +70 include/asm-generic/uaccess.h bd79f94758c011 Christoph Hellwig 2019-04-23 69 eed417ddd52146 Arnd Bergmann 2009-05-13 @70 #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) eed417ddd52146 Arnd Bergmann 2009-05-13 71 :::::: The code at line 70 was first introduced by commit :::::: eed417ddd52146f446595b5a7d8f21b1814b95b7 asm-generic: add a generic uaccess.h :::::: TO: Arnd Bergmann <arnd(a)arndb.de&gt; :::::: CC: Arnd Bergmann <arnd(a)klappe2.(none)&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org