tree: https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.iov_iter head: 3d790e1f3757c80812edde517bc02d3f080ddd05 commit: 658ac2d3097c9bb5aa0cba780dbcd49867f2d35a [12/37] iov_iter: separate direction from flavour config: riscv-randconfig-s031-20210608 (attached as .config) compiler: riscv32-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: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git/commit/?id=6... git remote add vfs https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git git fetch --no-tags vfs work.iov_iter git checkout 658ac2d3097c9bb5aa0cba780dbcd49867f2d35a # 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__' W=1 ARCH=riscv 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 >>): lib/iov_iter.c: In function 'iov_iter_init': 2023 | EXPORT_SYMBOL(import_single_range); | 492 | WARN_ON_ONCE(uaccess_kernel(); | ^~~~~~~~~~~~ lib/iov_iter.c:492:2: note: each undeclared identifier is reported only once for each function it appears in 492 | WARN_ON_ONCE(uaccess_kernel(); | ^ | ; ...... 2023 | EXPORT_SYMBOL(import_single_range); | 492 | WARN_ON_ONCE(uaccess_kernel(); | ^~~~~~~~~~~~ At top level: lib/iov_iter.c:414:15: warning: 'copy_page_to_iter_pipe' defined but not used [-Wunused-function] 414 | static size_t copy_page_to_iter_pipe(struct page *page, size_t offset, size_t bytes, | ^~~~~~~~~~~~~~~~~~~~~~ lib/iov_iter.c:287:15: warning: 'copy_page_from_iter_iovec' defined but not used [-Wunused-function] 287 | static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t bytes, | ^~~~~~~~~~~~~~~~~~~~~~~~~ lib/iov_iter.c:203:15: warning: 'copy_page_to_iter_iovec' defined but not used [-Wunused-function] 203 | static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t bytes, | ^~~~~~~~~~~~~~~~~~~~~~~ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for ERRATA_SIFIVE Depends on RISCV_ERRATA_ALTERNATIVE Selected by - SOC_SIFIVE vim +/WARN_ON_ONCE +2023 lib/iov_iter.c bc917be8105993 Al Viro 2015-03-21 2009 bc917be8105993 Al Viro 2015-03-21 2010 int import_single_range(int rw, void __user *buf, size_t len, bc917be8105993 Al Viro 2015-03-21 2011 struct iovec *iov, struct iov_iter *i) bc917be8105993 Al Viro 2015-03-21 2012 { bc917be8105993 Al Viro 2015-03-21 2013 if (len > MAX_RW_COUNT) bc917be8105993 Al Viro 2015-03-21 2014 len = MAX_RW_COUNT; 96d4f267e40f95 Linus Torvalds 2019-01-03 2015 if (unlikely(!access_ok(buf, len))) bc917be8105993 Al Viro 2015-03-21 2016 return -EFAULT; bc917be8105993 Al Viro 2015-03-21 2017 bc917be8105993 Al Viro 2015-03-21 2018 iov->iov_base = buf; bc917be8105993 Al Viro 2015-03-21 2019 iov->iov_len = len; bc917be8105993 Al Viro 2015-03-21 2020 iov_iter_init(i, rw, iov, 1, len); bc917be8105993 Al Viro 2015-03-21 2021 return 0; bc917be8105993 Al Viro 2015-03-21 2022 } e12675853d717c Al Viro 2015-12-06 @2023 EXPORT_SYMBOL(import_single_range); :::::: The code at line 2023 was first introduced by commit :::::: e12675853d717ce8de7d91089cc1a95bb8525f6c iov_iter: export import_single_range() :::::: TO: Al Viro <viro(a)zeniv.linux.org.uk&gt; :::::: CC: Al Viro <viro(a)zeniv.linux.org.uk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org