tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5 commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 8 weeks ago config: m68k-randconfig-s031-20200817 (attached as .config) compiler: m68k-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-180-g49f7e13a-dirty git checkout 670d0a4b10704667765f7d18f7592993d02783aa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/video/fbdev/q40fb.c:105:27: sparse: got char * drivers/video/fbdev/q40fb.c:136:12: sparse: sparse: symbol 'q40fb_init' was not declared. Should it be static? -- drivers/macintosh/via-cuda.c:520:24: sparse: sparse: Using plain integer as NULL pointer drivers/macintosh/via-cuda.c:213:9: sparse: got unsigned char volatile [usertype] *extern [addressable] [toplevel] via1 # 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 fetch --no-tags linus master git checkout 670d0a4b10704667765f7d18f7592993d02783aa vim +105 drivers/video/fbdev/q40fb.c ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 84 48c68c4f1b5424 drivers/video/q40fb.c Greg Kroah-Hartman 2012-12-21 85 static int q40fb_probe(struct platform_device *dev) ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 86 { ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 87 struct fb_info *info; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 88 ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 89 if (!MACH_IS_Q40) ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 90 return -ENXIO; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 91 ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 92 /* mapped in q40/config.c */ ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 93 q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 94 ce303c076baad1 drivers/video/q40fb.c Antonino A. Daplas 2007-07-17 95 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev); ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 96 if (!info) ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 97 return -ENOMEM; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 98 ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 99 info->var = q40fb_var; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 100 info->fix = q40fb_fix; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 101 info->fbops = &q40fb_ops; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 102 info->flags = FBINFO_DEFAULT; /* not as module for now */ ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 103 info->pseudo_palette = info->par; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 104 info->par = NULL; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 @105 info->screen_base = (char *) q40fb_fix.smem_start; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 106 ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 107 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 108 framebuffer_release(info); ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 109 return -ENOMEM; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 110 } ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 111 ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 112 master_outb(3, DISPLAY_CONTROL_REG); ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 113 ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 114 if (register_framebuffer(info) < 0) { ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 115 printk(KERN_ERR "Unable to register Q40 frame buffer\n"); ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 116 fb_dealloc_cmap(&info->cmap); ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 117 framebuffer_release(info); ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 118 return -EINVAL; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 119 } ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 120 31b6780c15a4e3 drivers/video/q40fb.c Joe Perches 2013-09-19 121 fb_info(info, "Q40 frame buffer alive and kicking !\n"); ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 122 return 0; ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 123 } ^1da177e4c3f41 drivers/video/q40fb.c Linus Torvalds 2005-04-16 124 :::::: The code at line 105 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org