Hi Lorenzo, FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable head: 7de6fd8ab65003f050aa58e705592745717ed318 commit: 6a9318f28d7e371692838677c364145fe04b1093 [75/80] fb_defio: do not use deprecated page->mapping, index fields config: arm-randconfig-001-20250203 (https://download.01.org/0day-ci/archive/20250203/202502030356.JNL7I49s-lkp@xxxxxxxxx/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250203/202502030356.JNL7I49s-lkp@xxxxxxxxx/reproduce) 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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202502030356.JNL7I49s-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): >> drivers/video/fbdev/core/fb_defio.c:272:3: error: call to undeclared function 'mapping_wrprotect_page'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 272 | mapping_wrprotect_page(fbdefio->mapping, pgoff, 1, page); | ^ 1 error generated. vim +/mapping_wrprotect_page +272 drivers/video/fbdev/core/fb_defio.c 258 259 /* workqueue callback */ 260 static void fb_deferred_io_work(struct work_struct *work) 261 { 262 struct fb_info *info = container_of(work, struct fb_info, deferred_work.work); 263 struct fb_deferred_io_pageref *pageref, *next; 264 struct fb_deferred_io *fbdefio = info->fbdefio; 265 266 /* here we wrprotect the page's mappings, then do all deferred IO. */ 267 mutex_lock(&fbdefio->lock); 268 list_for_each_entry(pageref, &fbdefio->pagereflist, list) { 269 struct page *page = pageref->page; 270 pgoff_t pgoff = pageref->offset >> PAGE_SHIFT; 271 > 272 mapping_wrprotect_page(fbdefio->mapping, pgoff, 1, page); 273 } 274 275 /* driver's callback with pagereflist */ 276 fbdefio->deferred_io(info, &fbdefio->pagereflist); 277 278 /* clear the list */ 279 list_for_each_entry_safe(pageref, next, &fbdefio->pagereflist, list) 280 fb_deferred_io_pageref_put(pageref, info); 281 282 mutex_unlock(&fbdefio->lock); 283 } 284 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
