linux-kernel - Re: [PATCH] alarmtimer: fix unexpected rtc interrupt when system resume

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Date:	Thu, 5 Nov 2015 13:45:08 +0800
From:	kbuild test robot <lkp@...el.com>
To:	zhuo-hao.lee@...el.com
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>, zhuohao.lee82@...il.com,
	zhuo-hao.lee@...el.com
Subject: Re: [PATCH] alarmtimer: fix unexpected rtc interrupt when system
 resume

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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