tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git linux-4.19.y head: 399849e4654ea496a6217ba4e5ee3d304c995ab4 commit: a24f9d6cf9bd65c1305344134e0182ed7bef76c8 [89/127] riscv/atomic: Fix sign extension for RV64I config: riscv-randconfig-s031-20210816 (attached as .config) compiler: riscv32-linux-gcc (GCC) 11.2.0 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: v0.6.3-348-gf0e6938b-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable linux-4.19.y git checkout a24f9d6cf9bd65c1305344134e0182ed7bef76c8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash 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 >>) lib/rhashtable.c:302:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct bucket_table [noderef] <asn:4> *_n_ @@ got struct bucket_table *new_tbl @@ lib/rhashtable.c:302:13: sparse: expected struct bucket_table [noderef] <asn:4> *_n_ lib/rhashtable.c:302:13: sparse: got struct bucket_table *new_tbl vim +302 lib/rhashtable.c 97defe1ecf868b Thomas Graf 2015-01-02 291 b824478b2145be Herbert Xu 2015-03-24 292 static int rhashtable_rehash_attach(struct rhashtable *ht, b824478b2145be Herbert Xu 2015-03-24 293 struct bucket_table *old_tbl, aa34a6cb047884 Herbert Xu 2015-03-11 294 struct bucket_table *new_tbl) 97defe1ecf868b Thomas Graf 2015-01-02 295 { aa34a6cb047884 Herbert Xu 2015-03-11 296 /* Make insertions go into the new, empty table right away. Deletions aa34a6cb047884 Herbert Xu 2015-03-11 297 * and lookups will be attempted in both tables until we synchronize. 0ad66449aa3cba NeilBrown 2018-06-18 298 * As cmpxchg() provides strong barriers, we do not need 0ad66449aa3cba NeilBrown 2018-06-18 299 * rcu_assign_pointer(). aa34a6cb047884 Herbert Xu 2015-03-11 300 */ aa34a6cb047884 Herbert Xu 2015-03-11 301 0ad66449aa3cba NeilBrown 2018-06-18 @302 if (cmpxchg(&old_tbl->future_tbl, NULL, new_tbl) != NULL) 0ad66449aa3cba NeilBrown 2018-06-18 303 return -EEXIST; b824478b2145be Herbert Xu 2015-03-24 304 b824478b2145be Herbert Xu 2015-03-24 305 return 0; b824478b2145be Herbert Xu 2015-03-24 306 } b824478b2145be Herbert Xu 2015-03-24 307 :::::: The code at line 302 was first introduced by commit :::::: 0ad66449aa3cbaedbdeaf55bffce74084bb7e9f9 rhashtable: use cmpxchg() to protect ->future_tbl. :::::: TO: NeilBrown <neilb(a)suse.com&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org