Hi wangtao,

kernel test robot noticed the following build errors:

[auto build test ERROR on brauner-vfs/vfs.all] [also build test ERROR on next-20250530] [cannot apply to linus/master v6.15] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/wangtao/fs-allow-cross-FS-cop... base: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all patch link: https://lore.kernel.org/r/20250530103941.11092-4-tao.wangtao%40honor.com patch subject: [PATCH v3 3/4] udmabuf: Implement udmabuf rw_file callback config: sparc64-randconfig-002-20250530 (https://download.01.org/0day-ci/archive/20250530/202505302235.mDzENMSm-lkp@i...) compiler: sparc64-linux-gcc (GCC) 15.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250530/202505302235.mDzENMSm-lkp@i...)

If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot lkp@intel.com | Closes: https://lore.kernel.org/oe-kbuild-all/202505302235.mDzENMSm-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

drivers/dma-buf/udmabuf.c: In function 'udmabuf_rw_file':

...

drivers/dma-buf/udmabuf.c:298:25: error: storage size of 'iter' isn't known

298 | struct iov_iter iter; | ^~~~

...

drivers/dma-buf/udmabuf.c:299:45: error: 'ITER_SOURCE' undeclared (first use in this function)

299 | unsigned int direction = is_write ? ITER_SOURCE : ITER_DEST; | ^~~~~~~~~~~ drivers/dma-buf/udmabuf.c:299:45: note: each undeclared identifier is reported only once for each function it appears in

...

drivers/dma-buf/udmabuf.c:299:59: error: 'ITER_DEST' undeclared (first use in this function)

299 | unsigned int direction = is_write ? ITER_SOURCE : ITER_DEST; | ^~~~~~~~~

...

drivers/dma-buf/udmabuf.c:327:17: error: implicit declaration of function 'iov_iter_bvec'; did you mean 'bvec_iter_bvec'? [-Wimplicit-function-declaration]

327 | iov_iter_bvec(&iter, direction, bvec, bv_idx, bv_total); | ^~~~~~~~~~~~~ | bvec_iter_bvec

...

drivers/dma-buf/udmabuf.c:298:25: warning: unused variable 'iter' [-Wunused-variable]

298 | struct iov_iter iter; | ^~~~

vim +298 drivers/dma-buf/udmabuf.c

286 287 static ssize_t udmabuf_rw_file(struct dma_buf *dmabuf, loff_t my_pos, 288 struct file *other, loff_t pos, 289 size_t count, bool is_write) 290 { 291 struct udmabuf *ubuf = dmabuf->priv; 292 loff_t my_end = my_pos + count, bv_beg, bv_end = 0; 293 pgoff_t pg_idx = my_pos / PAGE_SIZE; 294 pgoff_t pg_end = DIV_ROUND_UP(my_end, PAGE_SIZE); 295 size_t i, bv_off, bv_len, bv_num, bv_idx = 0, bv_total = 0; 296 struct bio_vec *bvec; 297 struct kiocb kiocb;

298 struct iov_iter iter; 299 unsigned int direction = is_write ? ITER_SOURCE : ITER_DEST;

300 ssize_t ret = 0, rw_total = 0; 301 struct folio *folio; 302 303 bv_num = min_t(size_t, pg_end - pg_idx + 1, 1024); 304 bvec = kvcalloc(bv_num, sizeof(*bvec), GFP_KERNEL); 305 if (!bvec) 306 return -ENOMEM; 307 308 init_sync_kiocb(&kiocb, other); 309 kiocb.ki_pos = pos; 310 311 for (i = 0; i < ubuf->nr_pinned && my_pos < my_end; i++) { 312 folio = ubuf->pinned_folios[i]; 313 bv_beg = bv_end; 314 bv_end += folio_size(folio); 315 if (bv_end <= my_pos) 316 continue; 317 318 bv_len = min(bv_end, my_end) - my_pos; 319 bv_off = my_pos - bv_beg; 320 my_pos += bv_len; 321 bv_total += bv_len; 322 bvec_set_page(&bvec[bv_idx], &folio->page, bv_len, bv_off); 323 if (++bv_idx < bv_num && my_pos < my_end) 324 continue; 325 326 /* start R/W if bvec is full or count reaches zero. */

327 iov_iter_bvec(&iter, direction, bvec, bv_idx, bv_total);

328 if (is_write) 329 ret = other->f_op->write_iter(&kiocb, &iter); 330 else 331 ret = other->f_op->read_iter(&kiocb, &iter); 332 if (ret <= 0) 333 break; 334 rw_total += ret; 335 if (ret < bv_total || fatal_signal_pending(current)) 336 break; 337 338 bv_idx = bv_total = 0; 339 } 340 kvfree(bvec); 341 342 return rw_total > 0 ? rw_total : ret; 343 } 344