Hi Bartlomiej, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: df2fbf5bfa0e7fff8b4784507e4d68f200454318 commit: a07a63b0e24dd1316d11427601a9f83dc955bb40 video: fbdev: controlfb: add COMPILE_TEST support date: 8 weeks ago :::::: branch date: 7 hours ago :::::: commit date: 8 weeks ago config: m68k-randconfig-r025-20200612 (attached as .config) compiler: m68k-linux-gcc (GCC) 9.3.0 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 git checkout a07a63b0e24dd1316d11427601a9f83dc955bb40 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 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 >>, old ones prefixed by <<): drivers/video/fbdev/controlfb.c: In function 'controlfb_mmap': drivers/video/fbdev/controlfb.c:326:23: error: implicit declaration of function 'pgprot_noncached' [-Werror=implicit-function-declaration] 326 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | ^~~~~~~~~~~~~~~~ drivers/video/fbdev/controlfb.c: In function 'controlfb_setcolreg': drivers/video/fbdev/controlfb.c:373:13: warning: variable 'b' set but not used [-Wunused-but-set-variable] 373 | __u8 r, g, b; | ^ drivers/video/fbdev/controlfb.c:373:10: warning: variable 'g' set but not used [-Wunused-but-set-variable] 373 | __u8 r, g, b; | ^ drivers/video/fbdev/controlfb.c:373:7: warning: variable 'r' set but not used [-Wunused-but-set-variable] 373 | __u8 r, g, b; | ^ drivers/video/fbdev/controlfb.c: In function 'control_set_hardware': drivers/video/fbdev/controlfb.c:505:11: warning: variable 'cmode' set but not used [-Wunused-but-set-variable] 505 | int i, cmode; | ^~~~~ cc1: some warnings being treated as errors # 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 remote update linus git checkout a07a63b0e24dd1316d11427601a9f83dc955bb40 vim +326 drivers/video/fbdev/controlfb.c ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 303 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 304 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 305 /* ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 306 * Private mmap since we want to have a different caching on the framebuffer ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 307 * for controlfb. ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 308 * Note there's no locking in here; it's done in fb_mmap() in fbmem.c. ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 309 */ 216d526c89d144 drivers/video/controlfb.c Christoph Hellwig 2006-01-14 310 static int controlfb_mmap(struct fb_info *info, ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 311 struct vm_area_struct *vma) ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 312 { 47f698a9f2fc49 drivers/video/controlfb.c Tomi Valkeinen 2013-04-17 313 unsigned long mmio_pgoff; 47f698a9f2fc49 drivers/video/controlfb.c Tomi Valkeinen 2013-04-17 314 unsigned long start; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 315 u32 len; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 316 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 317 start = info->fix.smem_start; 47f698a9f2fc49 drivers/video/controlfb.c Tomi Valkeinen 2013-04-17 318 len = info->fix.smem_len; 47f698a9f2fc49 drivers/video/controlfb.c Tomi Valkeinen 2013-04-17 319 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 47f698a9f2fc49 drivers/video/controlfb.c Tomi Valkeinen 2013-04-17 320 if (vma->vm_pgoff >= mmio_pgoff) { ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 321 if (info->var.accel_flags) ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 322 return -EINVAL; 47f698a9f2fc49 drivers/video/controlfb.c Tomi Valkeinen 2013-04-17 323 vma->vm_pgoff -= mmio_pgoff; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 324 start = info->fix.mmio_start; 47f698a9f2fc49 drivers/video/controlfb.c Tomi Valkeinen 2013-04-17 325 len = info->fix.mmio_len; 64b3d0e8122b42 drivers/video/controlfb.c Benjamin Herrenschmidt 2008-12-18 @326 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 327 } else { ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 328 /* framebuffer */ 64b3d0e8122b42 drivers/video/controlfb.c Benjamin Herrenschmidt 2008-12-18 329 vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot); ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 330 } ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 331 47f698a9f2fc49 drivers/video/controlfb.c Tomi Valkeinen 2013-04-17 332 return vm_iomap_memory(vma, start, len); ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 333 } ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 334 :::::: The code at line 326 was first introduced by commit :::::: 64b3d0e8122b422e879b23d42f9e0e8efbbf9744 powerpc/mm: Rework usage of _PAGE_COHERENT/NO_CACHE/GUARDED :::::: TO: Benjamin Herrenschmidt <benh(a)kernel.crashing.org&gt; :::::: CC: Paul Mackerras <paulus(a)samba.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org _______________________________________________ kbuild mailing list -- kbuild(a)lists.01.org To unsubscribe send an email to kbuild-leave(a)lists.01.org