Hi Vaibhav, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f40ddce88593482919761f74910f42f4b84c004b commit: 348b2956d5e6d9876b567226184de598d00c9bd1 fbdev: aty: use generic power management date: 5 months ago config: powerpc64-randconfig-r031-20210216 (attached as .config) compiler: powerpc64-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 # 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 348b2956d5e6d9876b567226184de598d00c9bd1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64 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 >>): drivers/video/fbdev/aty/atyfb_base.c: In function 'aty_power_mgmt': 2002 | pm = aty_ld_lcd(POWER_MANAGEMENT, par); | ^~~~~~~~~~ | aty_ld_8 2004 | aty_st_lcd(POWER_MANAGEMENT, pm, par); | ^~~~~~~~~~ | aty_st_8 drivers/video/fbdev/aty/atyfb_base.c: In function 'aty_init': drivers/video/fbdev/aty/atyfb_base.c:2363:6: warning: variable 'dac_type' set but not used [-Wunused-but-set-variable] 2363 | u8 dac_type, dac_subtype, clk_type; | ^~~~~~~~ cc1: some warnings being treated as errors vim +2002 drivers/video/fbdev/aty/atyfb_base.c ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 1993 efc08a75d3a2d4 drivers/video/aty/atyfb_base.c Ville Syrjala 2006-12-08 1994 #ifdef CONFIG_PPC_PMAC ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 1995 /* Power management routines. Those are used for PowerBook sleep. ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 1996 */ ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 1997 static int aty_power_mgmt(int sleep, struct atyfb_par *par) ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 1998 { ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 1999 u32 pm; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2000 int timeout; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2001 ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 @2002 pm = aty_ld_lcd(POWER_MANAGEMENT, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2003 pm = (pm & ~PWR_MGT_MODE_MASK) | PWR_MGT_MODE_REG; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 @2004 aty_st_lcd(POWER_MANAGEMENT, pm, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2005 pm = aty_ld_lcd(POWER_MANAGEMENT, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2006 ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2007 timeout = 2000; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2008 if (sleep) { ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2009 /* Sleep */ ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2010 pm &= ~PWR_MGT_ON; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2011 aty_st_lcd(POWER_MANAGEMENT, pm, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2012 pm = aty_ld_lcd(POWER_MANAGEMENT, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2013 udelay(10); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2014 pm &= ~(PWR_BLON | AUTO_PWR_UP); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2015 pm |= SUSPEND_NOW; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2016 aty_st_lcd(POWER_MANAGEMENT, pm, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2017 pm = aty_ld_lcd(POWER_MANAGEMENT, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2018 udelay(10); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2019 pm |= PWR_MGT_ON; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2020 aty_st_lcd(POWER_MANAGEMENT, pm, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2021 do { ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2022 pm = aty_ld_lcd(POWER_MANAGEMENT, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2023 mdelay(1); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2024 if ((--timeout) == 0) ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2025 break; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2026 } while ((pm & PWR_MGT_STATUS_MASK) != PWR_MGT_STATUS_SUSPEND); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2027 } else { ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2028 /* Wakeup */ ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2029 pm &= ~PWR_MGT_ON; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2030 aty_st_lcd(POWER_MANAGEMENT, pm, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2031 pm = aty_ld_lcd(POWER_MANAGEMENT, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2032 udelay(10); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2033 pm &= ~SUSPEND_NOW; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2034 pm |= (PWR_BLON | AUTO_PWR_UP); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2035 aty_st_lcd(POWER_MANAGEMENT, pm, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2036 pm = aty_ld_lcd(POWER_MANAGEMENT, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2037 udelay(10); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2038 pm |= PWR_MGT_ON; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2039 aty_st_lcd(POWER_MANAGEMENT, pm, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2040 do { ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2041 pm = aty_ld_lcd(POWER_MANAGEMENT, par); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2042 mdelay(1); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2043 if ((--timeout) == 0) ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2044 break; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2045 } while ((pm & PWR_MGT_STATUS_MASK) != 0); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2046 } ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2047 mdelay(500); ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2048 ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2049 return timeout ? 0 : -EIO; ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2050 } b7468168631e03 drivers/video/aty/atyfb_base.c Benjamin Herrenschmidt 2009-02-05 2051 #endif /* CONFIG_PPC_PMAC */ ^1da177e4c3f41 drivers/video/aty/atyfb_base.c Linus Torvalds 2005-04-16 2052 :::::: The code at line 2002 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