linux-kernel - Re: [PATCH v3 2/8] MIPS: ranchu: Add Goldfish RTC driver

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Date:   Mon, 24 Jul 2017 07:50:39 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Aleksandar Markovic <aleksandar.markovic@...rk.com>
Cc:     kbuild-all@...org, linux-mips@...ux-mips.org,
        Miodrag Dinic <miodrag.dinic@...tec.com>,
        Goran Ferenc <goran.ferenc@...tec.com>,
        Aleksandar Markovic <aleksandar.markovic@...tec.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Bo Hu <bohu@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Douglas Leung <douglas.leung@...tec.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        James Hogan <james.hogan@...tec.com>,
        Jin Qian <jinqian@...gle.com>, linux-kernel@...r.kernel.org,
        linux-rtc@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Paul Burton <paul.burton@...tec.com>,
        Petar Jovanovic <petar.jovanovic@...tec.com>,
        Raghu Gandham <raghu.gandham@...tec.com>
Subject: Re: [PATCH v3 2/8] MIPS: ranchu: Add Goldfish RTC driver

Hi Miodrag,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.13-rc1 next-20170721]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Aleksandar-Markovic/MIPS-Add-virtual-Ranchu-board-as-a-generic-based-board/20170724-062318
config: blackfin-allyesconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=blackfin 

All warnings (new ones prefixed by >>):

   drivers/rtc/rtc-goldfish.c: In function 'goldfish_rtc_set_alarm':
>> drivers/rtc/rtc-goldfish.c:86:21: warning: right shift count >= width of type [-Wshift-count-overflow]
      writel((rtc_alarm >> 32), base + TIMER_ALARM_HIGH);
                        ^~
   drivers/rtc/rtc-goldfish.c: In function 'goldfish_rtc_set_time':
   drivers/rtc/rtc-goldfish.c:167:15: warning: right shift count >= width of type [-Wshift-count-overflow]
      writel((now >> 32), base + TIMER_TIME_HIGH);
                  ^~

vim +86 drivers/rtc/rtc-goldfish.c

    67	
    68	static int goldfish_rtc_set_alarm(struct device *dev,
    69			struct rtc_wkalrm *alrm)
    70	{
    71		struct goldfish_rtc *rtcdrv;
    72		unsigned long rtc_alarm;
    73		u64 rtc_status_reg;
    74		void __iomem *base;
    75		int ret = 0;
    76	
    77		rtcdrv = dev_get_drvdata(dev);
    78		base = rtcdrv->base;
    79	
    80		if (alrm->enabled) {
    81			ret = rtc_tm_to_time(&(alrm->time), &rtc_alarm);
    82			if (ret != 0)
    83				return ret;
    84	
    85			rtc_alarm *= NSEC_PER_SEC;
  > 86			writel((rtc_alarm >> 32), base + TIMER_ALARM_HIGH);
    87			writel(rtc_alarm, base + TIMER_ALARM_LOW);
    88		} else {
    89			/*
    90			 * if this function was called with enabled=0
    91			 * then it could mean that the application is
    92			 * trying to cancel an ongoing alarm
    93			 */
    94			rtc_status_reg = readl(base + TIMER_ALARM_STATUS);
    95			if (rtc_status_reg)
    96				writel(1, base + TIMER_CLEAR_ALARM);
    97		}
    98	
    99		return ret;
   100	}
   101	

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