Hi Christophe, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ff1ffd71d5f0612cf194f5705c671d6b64bf5f91 commit: 4eeef098b43242ed145c83fba9989d586d707589 powerpc/44x: Remove STDBINUTILS kconfig option date: 8 months ago config: powerpc-randconfig-r036-20210915 (attached as .config) compiler: powerpc-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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 4eeef098b43242ed145c83fba9989d586d707589 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): fs/buffer.c: In function 'block_read_full_page': 2342 | } | ^ -- fs/ext4/move_extent.c: In function 'mext_page_mkuptodate': 227 | } | ^ -- fs/exfat/fatent.c: In function 'exfat_zeroed_cluster': 277 | } | ^ vim +2342 fs/buffer.c 8ab22b9abb5c55 Hisashi Hifumi 2008-07-28 2251 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2252 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 2253 * Generic "read page" function for block devices that have the normal ^1da177e4c3f41 Linus Torvalds 2005-04-16 2254 * get_block functionality. This is most of the block device filesystems. ^1da177e4c3f41 Linus Torvalds 2005-04-16 2255 * Reads the page asynchronously --- the unlock_buffer() and ^1da177e4c3f41 Linus Torvalds 2005-04-16 2256 * set/clear_buffer_uptodate() functions propagate buffer state into the ^1da177e4c3f41 Linus Torvalds 2005-04-16 2257 * page struct once IO has completed. ^1da177e4c3f41 Linus Torvalds 2005-04-16 2258 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 2259 int block_read_full_page(struct page *page, get_block_t *get_block) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2260 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 2261 struct inode *inode = page->mapping->host; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2262 sector_t iblock, lblock; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2263 struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; 45bce8f3e3436b Linus Torvalds 2012-11-29 2264 unsigned int blocksize, bbits; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2265 int nr, i; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2266 int fully_mapped = 1; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2267 45bce8f3e3436b Linus Torvalds 2012-11-29 2268 head = create_page_buffers(page, inode, 0); 45bce8f3e3436b Linus Torvalds 2012-11-29 2269 blocksize = head->b_size; 45bce8f3e3436b Linus Torvalds 2012-11-29 2270 bbits = block_size_bits(blocksize); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2271 09cbfeaf1a5a67 Kirill A. Shutemov 2016-04-01 2272 iblock = (sector_t)page->index << (PAGE_SHIFT - bbits); 45bce8f3e3436b Linus Torvalds 2012-11-29 2273 lblock = (i_size_read(inode)+blocksize-1) >> bbits; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2274 bh = head; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2275 nr = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2276 i = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2277 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2278 do { ^1da177e4c3f41 Linus Torvalds 2005-04-16 2279 if (buffer_uptodate(bh)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2280 continue; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2281 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2282 if (!buffer_mapped(bh)) { c64610ba585fab Andrew Morton 2005-05-16 2283 int err = 0; c64610ba585fab Andrew Morton 2005-05-16 2284 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2285 fully_mapped = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2286 if (iblock < lblock) { b0cf2321c65991 Badari Pulavarty 2006-03-26 2287 WARN_ON(bh->b_size != blocksize); c64610ba585fab Andrew Morton 2005-05-16 2288 err = get_block(inode, iblock, bh, 0); c64610ba585fab Andrew Morton 2005-05-16 2289 if (err) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2290 SetPageError(page); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2291 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2292 if (!buffer_mapped(bh)) { eebd2aa355692a Christoph Lameter 2008-02-04 2293 zero_user(page, i * blocksize, blocksize); c64610ba585fab Andrew Morton 2005-05-16 2294 if (!err) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2295 set_buffer_uptodate(bh); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2296 continue; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2297 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2298 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 2299 * get_block() might have updated the buffer ^1da177e4c3f41 Linus Torvalds 2005-04-16 2300 * synchronously ^1da177e4c3f41 Linus Torvalds 2005-04-16 2301 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 2302 if (buffer_uptodate(bh)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2303 continue; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2304 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2305 arr[nr++] = bh; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2306 } while (i++, iblock++, (bh = bh->b_this_page) != head); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2307 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2308 if (fully_mapped) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2309 SetPageMappedToDisk(page); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2310 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2311 if (!nr) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 2312 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 2313 * All buffers are uptodate - we can set the page uptodate ^1da177e4c3f41 Linus Torvalds 2005-04-16 2314 * as well. But not if get_block() returned an error. ^1da177e4c3f41 Linus Torvalds 2005-04-16 2315 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 2316 if (!PageError(page)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2317 SetPageUptodate(page); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2318 unlock_page(page); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2319 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2320 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2321 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2322 /* Stage two: lock the buffers */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 2323 for (i = 0; i < nr; i++) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 2324 bh = arr[i]; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2325 lock_buffer(bh); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2326 mark_buffer_async_read(bh); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2327 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2328 ^1da177e4c3f41 Linus Torvalds 2005-04-16 2329 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 2330 * Stage 3: start the IO. Check for uptodateness ^1da177e4c3f41 Linus Torvalds 2005-04-16 2331 * inside the buffer lock in case another process reading ^1da177e4c3f41 Linus Torvalds 2005-04-16 2332 * the underlying blockdev brought it uptodate (the sct fix). ^1da177e4c3f41 Linus Torvalds 2005-04-16 2333 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 2334 for (i = 0; i < nr; i++) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 2335 bh = arr[i]; ^1da177e4c3f41 Linus Torvalds 2005-04-16 2336 if (buffer_uptodate(bh)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 2337 end_buffer_async_read(bh, 1); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2338 else 2a222ca992c35a Mike Christie 2016-06-05 2339 submit_bh(REQ_OP_READ, 0, bh); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2340 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 2341 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 @2342 } 1fe72eaa0f46a0 H Hartley Sweeten 2009-09-22 2343 EXPORT_SYMBOL(block_read_full_page); ^1da177e4c3f41 Linus Torvalds 2005-04-16 2344 :::::: The code at line 2342 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org