[akpm-mm:mm-unstable 146/165] drivers/video/fbdev/core/fb_defio.c:272:3: error: call to undeclared function 'mapping_wrprotect_range'; ISO C99 and later do not support implicit function declarations

[kernel test robot <lkp@intel.com>]

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:   8bf30f9d23eb5040d37e6e712789cee8e71e1577
commit: 85d65aec481df149bc5280cf1ad5f9b76f59f153 [146/165] fb_defio: do not use deprecated page->mapping, index fields
config: arm-randconfig-003-20250208 (https://download.01.org/0day-ci/archive/20250208/202502081229.nVX901zo-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 6807164500e9920638e2ab0cdb4bf8321d24f8eb)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250208/202502081229.nVX901zo-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502081229.nVX901zo-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/video/fbdev/core/fb_defio.c:136:34: error: too few arguments provided to function-like macro invocation
     136 |                 fb_err("no mapping available\n");
         |                                                ^
   include/linux/fb.h:887:9: note: macro 'fb_err' defined here
     887 | #define fb_err(fb_info, fmt, ...)                                       \
         |         ^
   drivers/video/fbdev/core/fb_defio.c:136:3: error: use of undeclared identifier 'fb_err'; did you mean 'xa_err'?
     136 |                 fb_err("no mapping available\n");
         |                 ^~~~~~
         |                 xa_err
   include/linux/xarray.h:223:19: note: 'xa_err' declared here
     223 | static inline int xa_err(void *entry)
         |                   ^
   drivers/video/fbdev/core/fb_defio.c:136:3: warning: expression result unused [-Wunused-value]
     136 |                 fb_err("no mapping available\n");
         |                 ^~~~~~
>> drivers/video/fbdev/core/fb_defio.c:272:3: error: call to undeclared function 'mapping_wrprotect_range'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     272 |                 mapping_wrprotect_range(fbdefio->mapping, pgoff,
         |                 ^
   1 warning and 3 errors generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for FB_DEFERRED_IO
   Depends on [n]: HAS_IOMEM [=y] && FB_CORE [=y] && MMU [=n]
   Selected by [y]:
   - FB_DMAMEM_HELPERS_DEFERRED [=y] && HAS_IOMEM [=y] && FB_CORE [=y]


vim +/mapping_wrprotect_range +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_range(fbdefio->mapping, pgoff,
   273						page_to_pfn(page), 1);
   274		}
   275	
   276		/* driver's callback with pagereflist */
   277		fbdefio->deferred_io(info, &fbdefio->pagereflist);
   278	
   279		/* clear the list */
   280		list_for_each_entry_safe(pageref, next, &fbdefio->pagereflist, list)
   281			fb_deferred_io_pageref_put(pageref, info);
   282	
   283		mutex_unlock(&fbdefio->lock);
   284	}
   285	

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