tree: https://git.kernel.org/pub/scm/linux/kernel/git/rw/uml.git linux-next head: 1aee020155f364ef538370d3392969f1077b9bae commit: dd3035a21ba7ccaa883d7107d357ad06320d78fc [13/19] um: add a UML specific futex implementation config: um-i386_defconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/rw/uml.git/commit/?id=dd3... git remote add uml https://git.kernel.org/pub/scm/linux/kernel/git/rw/uml.git git fetch --no-tags uml linux-next git checkout dd3035a21ba7ccaa883d7107d357ad06320d78fc # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=um SUBARCH=i386 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/um/kernel/skas/uaccess.c:292:15: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected unsigned int [noderef] [usertype] __user *uaddr @@ got unsigned int [usertype] * @@ arch/um/kernel/skas/uaccess.c:292:15: sparse: expected unsigned int [noderef] [usertype] __user *uaddr arch/um/kernel/skas/uaccess.c:292:15: sparse: got unsigned int [usertype] * arch/um/kernel/skas/uaccess.c:368:15: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected unsigned int [noderef] [usertype] __user *uaddr @@ got void * @@ arch/um/kernel/skas/uaccess.c:368:15: sparse: expected unsigned int [noderef] [usertype] __user *uaddr arch/um/kernel/skas/uaccess.c:368:15: sparse: got void * arch/um/kernel/skas/uaccess.c:373:15: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile *v @@ got unsigned int [noderef] [usertype] __user *__ai_ptr @@ arch/um/kernel/skas/uaccess.c:373:15: sparse: expected void const volatile *v arch/um/kernel/skas/uaccess.c:373:15: sparse: got unsigned int [noderef] [usertype] __user *__ai_ptr arch/um/kernel/skas/uaccess.c:373:15: sparse: sparse: cast removes address space '__user' of expression arch/um/kernel/skas/uaccess.c:373:15: sparse: sparse: cast removes address space '__user' of expression arch/um/kernel/skas/uaccess.c:373:15: sparse: sparse: cast removes address space '__user' of expression arch/um/kernel/skas/uaccess.c:373:15: sparse: sparse: cast removes address space '__user' of expression arch/um/kernel/skas/uaccess.c:378:9: sparse: expected void *addr arch/um/kernel/skas/uaccess.c:378:9: sparse: got unsigned int [noderef] [usertype] __user *uaddr arch/um/kernel/skas/uaccess.c:293:19: sparse: sparse: dereference of noderef expression arch/um/kernel/skas/uaccess.c:299:18: sparse: sparse: dereference of noderef expression arch/um/kernel/skas/uaccess.c:302:18: sparse: sparse: dereference of noderef expression arch/um/kernel/skas/uaccess.c:305:18: sparse: sparse: dereference of noderef expression arch/um/kernel/skas/uaccess.c:308:18: sparse: sparse: dereference of noderef expression arch/um/kernel/skas/uaccess.c:311:18: sparse: sparse: dereference of noderef expression arch/um/kernel/skas/uaccess.c:371:18: sparse: sparse: dereference of noderef expression vim +378 arch/um/kernel/skas/uaccess.c 370 371 *uval = *uaddr; 372 373 ret = cmpxchg(uaddr, oldval, newval); 374 375 #ifdef CONFIG_64BIT 376 pagefault_enable(); 377 #else --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org