[android-common:android15-6.6 1/1] kernel/time/tick-sched.c:212:12: warning: 'tick_cpu' is used uninitialized

[kernel test robot <lkp@intel.com>]

tree:   https://android.googlesource.com/kernel/common android15-6.6
head:   8da6283ef36c5c684bcfdd59631aba622c11749c
commit: a94ba5ab288780f141d741107751b4866bc24be3 [1/1] BACKPORT: timekeeping: Use READ/WRITE_ONCE() for tick_do_timer_cpu
config: i386-buildonly-randconfig-003-20240823 (https://download.01.org/0day-ci/archive/20240824/202408240419.ZDf9fwVP-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240824/202408240419.ZDf9fwVP-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408240419.ZDf9fwVP-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/time/tick-sched.c: In function 'tick_sched_do_timer':
>> kernel/time/tick-sched.c:212:12: warning: 'tick_cpu' is used uninitialized [-Wuninitialized]
     212 |         if (tick_cpu == cpu) {
         |            ^
   kernel/time/tick-sched.c:188:13: note: 'tick_cpu' was declared here
     188 |         int tick_cpu, cpu = smp_processor_id();
         |             ^~~~~~~~


vim +/tick_cpu +212 kernel/time/tick-sched.c

   210	
   211		/* Check, if the jiffies need an update */
 > 212		if (tick_cpu == cpu) {
   213			tick_do_update_jiffies64(now);
   214			trace_android_vh_jiffies_update(NULL);
   215		}
   216	
   217		/*
   218		 * If jiffies update stalled for too long (timekeeper in stop_machine()
   219		 * or VMEXIT'ed for several msecs), force an update.
   220		 */
   221		if (ts->last_tick_jiffies != jiffies) {
   222			ts->stalled_jiffies = 0;
   223			ts->last_tick_jiffies = READ_ONCE(jiffies);
   224		} else {
   225			if (++ts->stalled_jiffies == MAX_STALLED_JIFFIES) {
   226				tick_do_update_jiffies64(now);
   227				ts->stalled_jiffies = 0;
   228				ts->last_tick_jiffies = READ_ONCE(jiffies);
   229			}
   230		}
   231	
   232		if (ts->inidle)
   233			ts->got_idle_tick = 1;
   234	}
   235	

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