Hi zhuo-hao,

[auto build test WARNING on: tip/timers/core]
[also build test WARNING on: v4.3 next-20151104]

url:    
https://github.com/0day-ci/linux/commits/zhuo-hao-lee-intel-com/alarmtimer-fix-unexpected-rtc-interrupt-when-system-resume/20151105-124811
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> kernel/time/alarmtimer.c:280:20: sparse: incompatible types in conditional 
>> expression (different base types)
   kernel/time/alarmtimer.c: In function 'alarmtimer_resume':
   kernel/time/alarmtimer.c:280:9: error: void value not ignored as it ought to 
be
     return rtc ? rtc_timer_cancel(rtc, &rtctimer) : 0;
            ^
   kernel/time/alarmtimer.c:281:1: warning: control reaches end of non-void 
function [-Wreturn-type]
    }
    ^

vim +280 kernel/time/alarmtimer.c

   264          rtc_read_time(rtc, &tm);
   265          now = rtc_tm_to_ktime(tm);
   266          now = ktime_add(now, min);
   267  
   268          /* Set alarm, if in the past reject suspend briefly to handle */
   269          ret = rtc_timer_start(rtc, &rtctimer, now, ktime_set(0, 0));
   270          if (ret < 0)
   271                  __pm_wakeup_event(ws, MSEC_PER_SEC);
   272          return ret;
   273  }
   274  
   275  static int alarmtimer_resume(struct device *dev)
   276  {
   277          struct rtc_device *rtc;
   278  
   279          rtc = alarmtimer_get_rtcdev();
 > 280          return rtc ? rtc_timer_cancel(rtc, &rtctimer) : 0;
   281  }
   282  
   283  #else
   284  static int alarmtimer_suspend(struct device *dev)
   285  {
   286          return 0;
   287  }
   288  

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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