tree: https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next head: 18956295fea61e6a08a15d829b06e744830ae236 commit: 8b69aff891d42d194b3587c9b8ed32d896eef277 [107/140] scsi: sg: Rework mmap support config: sparc64-randconfig-s031-20210309 (attached as .config) compiler: sparc64-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: v0.6.3-262-g5e674421-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?id=8... git remote add mkp-scsi https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git git fetch --no-tags mkp-scsi for-next git checkout 8b69aff891d42d194b3587c9b8ed32d896eef277 # 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=sparc64 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 >>)" drivers/scsi/sg.c: note: in included file (through include/uapi/scsi/sg.h, include/scsi/sg.h): /opt/cross/gcc-9.3.0-nolibc/sparc64-linux/bin/../lib/gcc/sparc64-linux/9.3.0/include/stddef.h:406:9: sparse: sparse: preprocessor token offsetof redefined drivers/scsi/sg.c: note: in included file (through include/uapi/linux/posix_types.h, include/uapi/linux/types.h, include/linux/types.h, ...): include/linux/stddef.h:17:9: sparse: this was the original definition drivers/scsi/sg.c:2270:19: sparse: expected int res drivers/scsi/sg.c:2270:19: sparse: got restricted vm_fault_t drivers/scsi/sg.c:2319:16: sparse: expected restricted vm_fault_t drivers/scsi/sg.c:2319:16: sparse: got int [assigned] res vim +2270 drivers/scsi/sg.c 2264 2265 /* Note: the error return: VM_FAULT_SIGBUS causes a "bus error" */ 2266 static vm_fault_t 2267 sg_vma_fault(struct vm_fault *vmf) 2268 { 2269 int k, n, length; 2271 unsigned long offset; 2272 struct vm_area_struct *vma = vmf->vma; 2273 struct page *page; 2274 struct sg_scatter_hold *rsv_schp; 2275 struct sg_request *srp; 2276 struct sg_device *sdp; 2277 struct sg_fd *sfp; 2278 const char *nbp = "==NULL, bad"; 2279 2280 if (!vma) { 2281 pr_warn("%s: vma%s\n", __func__, nbp); 2282 goto out_err; 2283 } 2284 sfp = vma->vm_private_data; 2285 if (!sfp) { 2286 pr_warn("%s: sfp%s\n", __func__, nbp); 2287 goto out_err; 2288 } 2289 sdp = sfp->parentdp; 2290 if (sdp && unlikely(SG_IS_DETACHING(sdp))) { 2291 SG_LOG(1, sfp, "%s: device detaching\n", __func__); 2292 goto out_err; 2293 } 2294 srp = sfp->rsv_srp; 2295 if (!srp) { 2296 SG_LOG(1, sfp, "%s: srp%s\n", __func__, nbp); 2297 goto out_err; 2298 } 2299 mutex_lock(&sfp->f_mutex); 2300 rsv_schp = &srp->sgat_h; 2301 offset = vmf->pgoff << PAGE_SHIFT; 2302 if (offset >= (unsigned int)rsv_schp->buflen) { 2303 SG_LOG(1, sfp, "%s: offset[%lu] >= rsv.buflen\n", __func__, 2304 offset); 2305 goto out_err_unlock; 2306 } 2307 SG_LOG(5, sfp, "%s: vm_start=0x%lx, off=%lu\n", __func__, 2308 vma->vm_start, offset); 2309 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 2310 k = (int)offset / length; 2311 n = ((int)offset % length) >> PAGE_SHIFT; 2312 page = nth_page(rsv_schp->pages[k], n); 2313 get_page(page); 2314 vmf->page = page; 2315 res = 0; 2316 out_err_unlock: 2317 mutex_unlock(&sfp->f_mutex); 2318 out_err: 2320 } 2321 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org