tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 856deb866d16e29bd65952e0289066f6078af773 commit: e5fc436f06eef54ef512ea55a9db8eb9f2e76959 sparse: use static inline for __chk_{user,io}_ptr() date: 2 weeks ago config: riscv-randconfig-s032-20200915 (attached as .config) compiler: riscv64-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: v0.6.2-191-g10164920-dirty git checkout e5fc436f06eef54ef512ea55a9db8eb9f2e76959 # 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=riscv 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/riscv/kernel/perf_callchain.c:26:14: sparse: got unsigned long *user_frame_tail arch/riscv/kernel/perf_callchain.c:28:49: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const [noderef] __user *from @@ got unsigned long *user_frame_tail @@ arch/riscv/kernel/perf_callchain.c:28:49: sparse: expected void const [noderef] __user *from arch/riscv/kernel/perf_callchain.c:28:49: sparse: got unsigned long *user_frame_tail arch/riscv/kernel/perf_callchain.c:77:6: sparse: sparse: symbol 'fill_callchain' was not declared. Should it be static? # 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 e5fc436f06eef54ef512ea55a9db8eb9f2e76959 vim +26 arch/riscv/kernel/perf_callchain.c dbeb90b0c1eb86 Mao Han 2019-08-29 12 dbeb90b0c1eb86 Mao Han 2019-08-29 13 /* dbeb90b0c1eb86 Mao Han 2019-08-29 14 * Get the return address for a single stackframe and return a pointer to the dbeb90b0c1eb86 Mao Han 2019-08-29 15 * next frame tail. dbeb90b0c1eb86 Mao Han 2019-08-29 16 */ dbeb90b0c1eb86 Mao Han 2019-08-29 17 static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry, dbeb90b0c1eb86 Mao Han 2019-08-29 18 unsigned long fp, unsigned long reg_ra) dbeb90b0c1eb86 Mao Han 2019-08-29 19 { dbeb90b0c1eb86 Mao Han 2019-08-29 20 struct stackframe buftail; dbeb90b0c1eb86 Mao Han 2019-08-29 21 unsigned long ra = 0; dbeb90b0c1eb86 Mao Han 2019-08-29 22 unsigned long *user_frame_tail = dbeb90b0c1eb86 Mao Han 2019-08-29 23 (unsigned long *)(fp - sizeof(struct stackframe)); dbeb90b0c1eb86 Mao Han 2019-08-29 24 dbeb90b0c1eb86 Mao Han 2019-08-29 25 /* Check accessibility of one struct frame_tail beyond */ dbeb90b0c1eb86 Mao Han 2019-08-29 @26 if (!access_ok(user_frame_tail, sizeof(buftail))) dbeb90b0c1eb86 Mao Han 2019-08-29 27 return 0; dbeb90b0c1eb86 Mao Han 2019-08-29 28 if (__copy_from_user_inatomic(&buftail, user_frame_tail, dbeb90b0c1eb86 Mao Han 2019-08-29 29 sizeof(buftail))) dbeb90b0c1eb86 Mao Han 2019-08-29 30 return 0; dbeb90b0c1eb86 Mao Han 2019-08-29 31 dbeb90b0c1eb86 Mao Han 2019-08-29 32 if (reg_ra != 0) dbeb90b0c1eb86 Mao Han 2019-08-29 33 ra = reg_ra; dbeb90b0c1eb86 Mao Han 2019-08-29 34 else dbeb90b0c1eb86 Mao Han 2019-08-29 35 ra = buftail.ra; dbeb90b0c1eb86 Mao Han 2019-08-29 36 dbeb90b0c1eb86 Mao Han 2019-08-29 37 fp = buftail.fp; dbeb90b0c1eb86 Mao Han 2019-08-29 38 if (ra != 0) dbeb90b0c1eb86 Mao Han 2019-08-29 39 perf_callchain_store(entry, ra); dbeb90b0c1eb86 Mao Han 2019-08-29 40 else dbeb90b0c1eb86 Mao Han 2019-08-29 41 return 0; dbeb90b0c1eb86 Mao Han 2019-08-29 42 dbeb90b0c1eb86 Mao Han 2019-08-29 43 return fp; dbeb90b0c1eb86 Mao Han 2019-08-29 44 } dbeb90b0c1eb86 Mao Han 2019-08-29 45 :::::: The code at line 26 was first introduced by commit :::::: dbeb90b0c1eb86a9b963b929d3c937afb7dadfa3 riscv: Add perf callchain support :::::: TO: Mao Han <han_mao(a)c-sky.com&gt; :::::: CC: Paul Walmsley <paul.walmsley(a)sifive.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org