Hi Jani, I love your patch! Yet something to improve: [auto build test ERROR on drm-intel/for-linux-next] [cannot apply to drm-exynos/exynos-drm-next linus/master v5.4 v5.4-rc8 v5.4-rc7 next-20191203 v5.4 next-20191203] [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-etc-constify-fbops-in-struct-fb_info/20191204-055320 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 7.5.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.5.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): drivers/video/fbdev/udlfb.c: In function 'dlfb_ops_release': >> drivers/video/fbdev/udlfb.c:1040:24: error: assignment of member 'fb_mmap' in read-only object info->fbops->fb_mmap = dlfb_ops_mmap; ^ -- drivers/video/fbdev/smscufx.c: In function 'ufx_ops_release': >> drivers/video/fbdev/smscufx.c:1173:24: error: assignment of member 'fb_mmap' in read-only object info->fbops->fb_mmap = ufx_ops_mmap; ^ -- drivers/video/fbdev/core/fb_defio.c: In function 'fb_deferred_io_init': >> drivers/video/fbdev/core/fb_defio.c:209:23: error: assignment of member 'fb_mmap' in read-only object info->fbops->fb_mmap = fb_deferred_io_mmap; ^ drivers/video/fbdev/core/fb_defio.c: In function 'fb_deferred_io_cleanup': drivers/video/fbdev/core/fb_defio.c:240:23: error: assignment of member 'fb_mmap' in read-only object info->fbops->fb_mmap = NULL; ^ vim +/fb_mmap +1040 drivers/video/fbdev/udlfb.c 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1026 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1027 /* 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1028 * Assumes caller is holding info->lock mutex (for open and release at least) 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1029 */ 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1030 static int dlfb_ops_release(struct fb_info *info, int user) 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1031 { 7ea46206d1706b drivers/video/fbdev/udlfb.c Ladislav Michl 2018-01-15 1032 struct dlfb_data *dlfb = info->par; 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1033 7ea46206d1706b drivers/video/fbdev/udlfb.c Ladislav Michl 2018-01-15 1034 dlfb->fb_count--; 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1035 7ea46206d1706b drivers/video/fbdev/udlfb.c Ladislav Michl 2018-01-15 1036 if ((dlfb->fb_count == 0) && (info->fbdefio)) { 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1037 fb_deferred_io_cleanup(info); 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1038 kfree(info->fbdefio); 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1039 info->fbdefio = NULL; 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 @1040 info->fbops->fb_mmap = dlfb_ops_mmap; 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1041 } 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1042 5865889fe43194 drivers/video/fbdev/udlfb.c Ladislav Michl 2018-01-16 1043 dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count); 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1044 33077b8d3042e0 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-09-05 1045 return 0; 2469d5dbcafe06 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-02-15 1046 } 2469d5dbcafe06 drivers/staging/udlfb/udlfb.c Bernie Thompson 2010-02-15 1047 :::::: The code at line 1040 was first introduced by commit :::::: 33077b8d3042e01da61924973e372abe589ba297 staging: udlfb: revamp reference handling to insure successful shutdown :::::: TO: Bernie Thompson <bernie@xxxxxxxxxxxx> :::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx Intel Corporation
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