linux-kernel - drivers/rtc/rtc-pcf85063.c:292:40: warning: Clarify calculation precedence for '&' and

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Message-ID: <202007301329.vj66ufFB%lkp@intel.com>
Date:   Thu, 30 Jul 2020 13:30:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: drivers/rtc/rtc-pcf85063.c:292:40: warning: Clarify calculation
 precedence for '&' and

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d3590ebf6f91350192737dd1d1b219c05277f067
commit: f86dc5bde18e540743eaef20529d9f2b67283abd rtc: pcf85063: return meaningful value for RTC_VL_READ
date:   8 months ago
compiler: or1k-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


cppcheck warnings: (new ones prefixed by >>)

>> drivers/rtc/rtc-pcf85063.c:292:40: warning: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
     status = status & PCF85063_REG_SC_OS ? RTC_VL_DATA_INVALID : 0;
                                          ^

vim +292 drivers/rtc/rtc-pcf85063.c

   279	
   280	static int pcf85063_ioctl(struct device *dev, unsigned int cmd,
   281				  unsigned long arg)
   282	{
   283		struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
   284		int status, ret = 0;
   285	
   286		switch (cmd) {
   287		case RTC_VL_READ:
   288			ret = regmap_read(pcf85063->regmap, PCF85063_REG_SC, &status);
   289			if (ret < 0)
   290				return ret;
   291	
 > 292			status = status & PCF85063_REG_SC_OS ? RTC_VL_DATA_INVALID : 0;
   293	
   294			return put_user(status, (unsigned int __user *)arg);
   295	
   296		default:
   297			return -ENOIOCTLCMD;
   298		}
   299	}
   300	

---
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