tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.4.y-rt head: 5fbf1e70f11dba64cc05c9d85120a3aa7c67a4a2 commit: 95c50e7fcaa1ebe6e9f8c98b385dcc10653781e9 [213/325] x86: Allow to enable RT config: x86_64-randconfig-s022-20200808 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-118-ge1578773-dirty git checkout 95c50e7fcaa1ebe6e9f8c98b385dcc10653781e9 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): kernel//time/hrtimer.c:120:21: warning: initialized field overwritten [-Woverride-init] 120 | [CLOCK_REALTIME] = HRTIMER_BASE_REALTIME, | ^~~~~~~~~~~~~~~~~~~~~ kernel//time/hrtimer.c:120:21: note: (near initialization for 'hrtimer_clock_to_base_table[0]') kernel//time/hrtimer.c:121:22: warning: initialized field overwritten [-Woverride-init] 121 | [CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC, | ^~~~~~~~~~~~~~~~~~~~~~ kernel//time/hrtimer.c:121:22: note: (near initialization for 'hrtimer_clock_to_base_table[1]') kernel//time/hrtimer.c:122:21: warning: initialized field overwritten [-Woverride-init] 122 | [CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME, | ^~~~~~~~~~~~~~~~~~~~~ kernel//time/hrtimer.c:122:21: note: (near initialization for 'hrtimer_clock_to_base_table[7]') kernel//time/hrtimer.c:123:17: warning: initialized field overwritten [-Woverride-init] 123 | [CLOCK_TAI] = HRTIMER_BASE_TAI, | ^~~~~~~~~~~~~~~~ kernel//time/hrtimer.c:123:17: note: (near initialization for 'hrtimer_clock_to_base_table[11]') 1986 | void cpu_chill(void) | ^~~~~~~~~ vim +/cpu_chill +1986 kernel//time/hrtimer.c edbeda46322fbc Al Viro 2017-06-07 1981 32f35d21bf065e Thomas Gleixner 2012-03-07 1982 #ifdef CONFIG_PREEMPT_RT 32f35d21bf065e Thomas Gleixner 2012-03-07 1983 /* 32f35d21bf065e Thomas Gleixner 2012-03-07 1984 * Sleep for 1 ms in hope whoever holds what we want will let it go. 32f35d21bf065e Thomas Gleixner 2012-03-07 1985 */ 32f35d21bf065e Thomas Gleixner 2012-03-07 @1986 void cpu_chill(void) 32f35d21bf065e Thomas Gleixner 2012-03-07 1987 { 32f35d21bf065e Thomas Gleixner 2012-03-07 1988 unsigned int freeze_flag = current->flags & PF_NOFREEZE; 32f35d21bf065e Thomas Gleixner 2012-03-07 1989 struct task_struct *self = current; 32f35d21bf065e Thomas Gleixner 2012-03-07 1990 ktime_t chill_time; 32f35d21bf065e Thomas Gleixner 2012-03-07 1991 32f35d21bf065e Thomas Gleixner 2012-03-07 1992 raw_spin_lock_irq(&self->pi_lock); 32f35d21bf065e Thomas Gleixner 2012-03-07 1993 self->saved_state = self->state; 32f35d21bf065e Thomas Gleixner 2012-03-07 1994 __set_current_state_no_track(TASK_UNINTERRUPTIBLE); 32f35d21bf065e Thomas Gleixner 2012-03-07 1995 raw_spin_unlock_irq(&self->pi_lock); 32f35d21bf065e Thomas Gleixner 2012-03-07 1996 32f35d21bf065e Thomas Gleixner 2012-03-07 1997 chill_time = ktime_set(0, NSEC_PER_MSEC); 32f35d21bf065e Thomas Gleixner 2012-03-07 1998 32f35d21bf065e Thomas Gleixner 2012-03-07 1999 current->flags |= PF_NOFREEZE; 32f35d21bf065e Thomas Gleixner 2012-03-07 2000 sleeping_lock_inc(); 32f35d21bf065e Thomas Gleixner 2012-03-07 2001 schedule_hrtimeout(&chill_time, HRTIMER_MODE_REL_HARD); 32f35d21bf065e Thomas Gleixner 2012-03-07 2002 sleeping_lock_dec(); 32f35d21bf065e Thomas Gleixner 2012-03-07 2003 if (!freeze_flag) 32f35d21bf065e Thomas Gleixner 2012-03-07 2004 current->flags &= ~PF_NOFREEZE; 32f35d21bf065e Thomas Gleixner 2012-03-07 2005 32f35d21bf065e Thomas Gleixner 2012-03-07 2006 raw_spin_lock_irq(&self->pi_lock); 32f35d21bf065e Thomas Gleixner 2012-03-07 2007 __set_current_state_no_track(self->saved_state); 32f35d21bf065e Thomas Gleixner 2012-03-07 2008 self->saved_state = TASK_RUNNING; 32f35d21bf065e Thomas Gleixner 2012-03-07 2009 raw_spin_unlock_irq(&self->pi_lock); 32f35d21bf065e Thomas Gleixner 2012-03-07 2010 } 32f35d21bf065e Thomas Gleixner 2012-03-07 2011 EXPORT_SYMBOL(cpu_chill); 32f35d21bf065e Thomas Gleixner 2012-03-07 2012 #endif 32f35d21bf065e Thomas Gleixner 2012-03-07 2013 :::::: The code at line 1986 was first introduced by commit :::::: 32f35d21bf065ee4d525b44e5ba47a674cd12fc3 rt: Introduce cpu_chill() :::::: TO: Thomas Gleixner <tglx(a)linutronix.de&gt; :::::: CC: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org