tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: c11d28ab4a691736e30b49813fb801847bd44e83 commit: a07a63b0e24dd1316d11427601a9f83dc955bb40 [2219/12102] video: fbdev: controlfb: add COMPILE_TEST support config: i386-allyesconfig (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce (this is a W=1 build): git checkout a07a63b0e24dd1316d11427601a9f83dc955bb40 # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): 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] __u8 r, g, b; ^ __u8 r, g, b; ^ drivers/video/fbdev/controlfb.c:373:7: warning: variable 'r' set but not used [-Wunused-but-set-variable] __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] int i, cmode; ^~~~~ vim +/g +373 drivers/video/fbdev/controlfb.c ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 367 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 368 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 369 u_int transp, struct fb_info *info) ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 370 { c4e423239ca7cb drivers/video/fbdev/controlfb.c Fabian Frederick 2014-09-17 371 struct fb_info_control *p = c4e423239ca7cb drivers/video/fbdev/controlfb.c Fabian Frederick 2014-09-17 372 container_of(info, struct fb_info_control, info); ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 @373 __u8 r, g, b; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 374 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 375 if (regno > 255) ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 376 return 1; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 377 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 378 r = red >> 8; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 379 g = green >> 8; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 380 b = blue >> 8; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 381 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 382 out_8(&p->cmap_regs->addr, regno); /* tell clut what addr to fill */ ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 383 out_8(&p->cmap_regs->lut, r); /* send one color channel at */ ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 384 out_8(&p->cmap_regs->lut, g); /* a time... */ ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 385 out_8(&p->cmap_regs->lut, b); ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 386 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 387 if (regno < 16) { ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 388 int i; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 389 switch (p->par.cmode) { ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 390 case CMODE_16: ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 391 p->pseudo_palette[regno] = ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 392 (regno << 10) | (regno << 5) | regno; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 393 break; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 394 case CMODE_32: ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 395 i = (regno << 8) | regno; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 396 p->pseudo_palette[regno] = (i << 16) | i; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 397 break; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 398 } ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 399 } ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 400 ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 401 return 0; ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 402 } ^1da177e4c3f41 drivers/video/controlfb.c Linus Torvalds 2005-04-16 403 :::::: The code at line 373 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