Hi Jani, I love your patch! Yet something to improve: [auto build test ERROR on drm-intel/for-linux-next] [also build test ERROR on v5.4 next-20191127] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Jani-Nikula/video-drm-constify-fbops-in-struct-fb_info/20191128-022047 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: x86_64-allyesconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-14) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): drivers/gpu/drm/udl/udl_fb.c: In function 'udl_fb_release': >> drivers/gpu/drm/udl/udl_fb.c:256:24: error: assignment of member 'fb_mmap' in read-only object info->fbops->fb_mmap = udl_fb_mmap; ^ vim +/fb_mmap +256 drivers/gpu/drm/udl/udl_fb.c 5320918b9a8786 Dave Airlie 2010-12-15 240 5320918b9a8786 Dave Airlie 2010-12-15 241 5320918b9a8786 Dave Airlie 2010-12-15 242 /* 5320918b9a8786 Dave Airlie 2010-12-15 243 * Assumes caller is holding info->lock mutex (for open and release at least) 5320918b9a8786 Dave Airlie 2010-12-15 244 */ 5320918b9a8786 Dave Airlie 2010-12-15 245 static int udl_fb_release(struct fb_info *info, int user) 5320918b9a8786 Dave Airlie 2010-12-15 246 { 5320918b9a8786 Dave Airlie 2010-12-15 247 struct udl_fbdev *ufbdev = info->par; 5320918b9a8786 Dave Airlie 2010-12-15 248 5320918b9a8786 Dave Airlie 2010-12-15 249 ufbdev->fb_count--; 5320918b9a8786 Dave Airlie 2010-12-15 250 2b721f20770ccb Daniel Vetter 2016-08-10 251 #ifdef CONFIG_DRM_FBDEV_EMULATION 5320918b9a8786 Dave Airlie 2010-12-15 252 if ((ufbdev->fb_count == 0) && (info->fbdefio)) { 5320918b9a8786 Dave Airlie 2010-12-15 253 fb_deferred_io_cleanup(info); 5320918b9a8786 Dave Airlie 2010-12-15 254 kfree(info->fbdefio); 5320918b9a8786 Dave Airlie 2010-12-15 255 info->fbdefio = NULL; 5320918b9a8786 Dave Airlie 2010-12-15 @256 info->fbops->fb_mmap = udl_fb_mmap; 5320918b9a8786 Dave Airlie 2010-12-15 257 } 2b721f20770ccb Daniel Vetter 2016-08-10 258 #endif 5320918b9a8786 Dave Airlie 2010-12-15 259 90991209837ab6 Mikulas Patocka 2018-06-03 260 pr_debug("released /dev/fb%d user=%d count=%d\n", 5320918b9a8786 Dave Airlie 2010-12-15 261 info->node, user, ufbdev->fb_count); 5320918b9a8786 Dave Airlie 2010-12-15 262 5320918b9a8786 Dave Airlie 2010-12-15 263 return 0; 5320918b9a8786 Dave Airlie 2010-12-15 264 } 5320918b9a8786 Dave Airlie 2010-12-15 265 :::::: The code at line 256 was first introduced by commit :::::: 5320918b9a87865223fd6b228e530bf30bc64d9d drm/udl: initial UDL driver (v4) :::::: TO: Dave Airlie <airlied@xxxxxxxxx> :::::: CC: Dave Airlie <airlied@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx Intel Corporation
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