tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git testing head: 55ecda6f25ef6de769ae64f162828aee4812c313 commit: 55ecda6f25ef6de769ae64f162828aee4812c313 [12/12] Merge branch 'intel-idle' into linux-next config: x86_64-randconfig-c001 (https://download.01.org/0day-ci/archive/20220428/202204281634.Ho3eVKJ7-lk...) compiler: gcc-11 (Debian 11.2.0-20) 11.2.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commi... git remote add rafael-pm https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git git fetch --no-tags rafael-pm testing git checkout 55ecda6f25ef6de769ae64f162828aee4812c313 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/ 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/idle/intel_idle.c: In function 'adl_idle_state_table_update': 1701 | disable_promotion_to_c1e = true; | ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/idle/intel_idle.c:1701:17: note: each undeclared identifier is reported only once for each function it appears in 1706 | c1e_promotion_enable(); | ^~~~~~~~~~~~~~~~~~~~ drivers/idle/intel_idle.c: At top level: drivers/idle/intel_idle.c:1854:13: warning: conflicting types for 'c1e_promotion_enable'; have 'void(void)' 1854 | static void c1e_promotion_enable(void) | ^~~~~~~~~~~~~~~~~~~~ drivers/idle/intel_idle.c:1854:13: error: static declaration of 'c1e_promotion_enable' follows non-static declaration drivers/idle/intel_idle.c:1706:9: note: previous implicit declaration of 'c1e_promotion_enable' with type 'void(void)' 1706 | c1e_promotion_enable(); | ^~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/disable_promotion_to_c1e +1701 drivers/idle/intel_idle.c 64233338499126 Chen Yu 2021-05-28 1685 cc6e234b826408 Zhang Rui 2022-04-15 1686 /** cc6e234b826408 Zhang Rui 2022-04-15 1687 * adl_idle_state_table_update - Adjust AlderLake idle states table. cc6e234b826408 Zhang Rui 2022-04-15 1688 */ cc6e234b826408 Zhang Rui 2022-04-15 1689 static void __init adl_idle_state_table_update(void) cc6e234b826408 Zhang Rui 2022-04-15 1690 { cc6e234b826408 Zhang Rui 2022-04-15 1691 /* Check if user prefers C1 over C1E. */ cc6e234b826408 Zhang Rui 2022-04-15 1692 if (preferred_states_mask & BIT(1)) { cc6e234b826408 Zhang Rui 2022-04-15 1693 if (preferred_states_mask & BIT(2)) cc6e234b826408 Zhang Rui 2022-04-15 1694 /* Both can't be enabled, stick to the defaults. */ cc6e234b826408 Zhang Rui 2022-04-15 1695 goto end; cc6e234b826408 Zhang Rui 2022-04-15 1696 cc6e234b826408 Zhang Rui 2022-04-15 1697 cpuidle_state_table[0].flags &= ~CPUIDLE_FLAG_UNUSABLE; cc6e234b826408 Zhang Rui 2022-04-15 1698 cpuidle_state_table[1].flags |= CPUIDLE_FLAG_UNUSABLE; cc6e234b826408 Zhang Rui 2022-04-15 1699 cc6e234b826408 Zhang Rui 2022-04-15 1700 /* Disable C1E by clearing the "C1E promotion" bit. */ cc6e234b826408 Zhang Rui 2022-04-15 @1701 disable_promotion_to_c1e = true; cc6e234b826408 Zhang Rui 2022-04-15 1702 return; cc6e234b826408 Zhang Rui 2022-04-15 1703 } cc6e234b826408 Zhang Rui 2022-04-15 1704 end: cc6e234b826408 Zhang Rui 2022-04-15 1705 /* Make sure C1E is enabled by default */ cc6e234b826408 Zhang Rui 2022-04-15 @1706 c1e_promotion_enable(); cc6e234b826408 Zhang Rui 2022-04-15 1707 } cc6e234b826408 Zhang Rui 2022-04-15 1708 :::::: The code at line 1701 was first introduced by commit :::::: cc6e234b8264089d11c34f82d6be925281ca52ba intel_idle: Add AlderLake support :::::: TO: Zhang Rui <rui.zhang(a)intel.com&gt; :::::: CC: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com&gt; -- 0-DAY CI Kernel Test Service https://01.org/lkp