[kbuild-all] [dhowells-fs:fscache-iter-3 2/8] fs/fscache/io.c:164:5: error: no previous prototype for '__fscache_fallback_read_page'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-iter-3 head: ae753cf3639743fb4c3d6e04a40b8f7ff7208ec4 commit: b5cd0254309847abfb2eebfbcbd4415d61c5af1b [2/8] fscache: Implement a fallback I/O interface to replace the old API config: microblaze-buildonly-randconfig-r002-20210916 (attached as .config) compiler: microblaze-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/com... git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git git fetch --no-tags dhowells-fs fscache-iter-3 git checkout b5cd0254309847abfb2eebfbcbd4415d61c5af1b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=microblaze 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 >>): 164 | int __fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ 194 | int __fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/fscache/io.c: In function '__fscache_fallback_write_page': fs/fscache/io.c:200:16: error: variable 'len' set but not used [-Werror=unused-but-set-variable] 200 | size_t len; | ^~~ fs/fscache/io.c:199:16: error: variable 'start' set but not used [-Werror=unused-but-set-variable] 199 | loff_t start; | ^~~~~ cc1: all warnings being treated as errors vim +/__fscache_fallback_read_page +164 fs/fscache/io.c 160 161 /* 162 * Fallback page reading interface. 163 */ 165 { 166 struct netfs_cache_resources cres; 167 struct iov_iter iter; 168 struct bio_vec bvec[1]; 169 int ret; 170 171 _enter("%lx", page->index); 172 173 memset(&cres, 0, sizeof(cres)); 174 bvec[0].bv_page = page; 175 bvec[0].bv_offset = 0; 176 bvec[0].bv_len = PAGE_SIZE; 177 iov_iter_bvec(&iter, READ, bvec, ARRAY_SIZE(bvec), PAGE_SIZE); 178 179 ret = fscache_begin_read_operation(&cres, cookie); 180 if (ret < 0) 181 return ret; 182 183 ret = fscache_read(&cres, page_offset(page), &iter, NETFS_READ_HOLE_FAIL, 184 NULL, NULL); 185 fscache_end_operation(&cres); 186 _leave(" = %d", ret); 187 return ret; 188 } 189 EXPORT_SYMBOL(__fscache_fallback_read_page); 190 191 /* 192 * Fallback page writing interface. 193 */ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org