linux-kernel - drivers/clocksource/timer-pistachio.c:74:22: warning: variable 'overflow' set but not used

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Message-ID: <202111200402.afQsussU-lkp@intel.com>
Date:   Sat, 20 Nov 2021 04:37:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Drew Fustini <drew@...gleboard.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: drivers/clocksource/timer-pistachio.c:74:22: warning: variable
 'overflow' set but not used

Hi Drew,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4c388a8e740d3235a194f330c8ef327deef710f6
commit: a47d7ef4550d08fb428ea4c3f1a9c71674212208 clocksource/drivers/pistachio: Fix trivial typo
date:   8 months ago
config: mips-randconfig-r012-20210927 (attached as .config)
compiler: mips-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a47d7ef4550d08fb428ea4c3f1a9c71674212208
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a47d7ef4550d08fb428ea4c3f1a9c71674212208
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=mips 

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

All warnings (new ones prefixed by >>):

   drivers/clocksource/timer-pistachio.c: In function 'pistachio_clocksource_read_cycles':
>> drivers/clocksource/timer-pistachio.c:74:22: warning: variable 'overflow' set but not used [-Wunused-but-set-variable]
      74 |         u32 counter, overflow;
         |                      ^~~~~~~~


vim +/overflow +74 drivers/clocksource/timer-pistachio.c

    69	
    70	static u64 notrace
    71	pistachio_clocksource_read_cycles(struct clocksource *cs)
    72	{
    73		struct pistachio_clocksource *pcs = to_pistachio_clocksource(cs);
  > 74		u32 counter, overflow;
    75		unsigned long flags;
    76	
    77		/*
    78		 * The counter value is only refreshed after the overflow value is read.
    79		 * And they must be read in strict order, hence raw spin lock added.
    80		 */
    81	
    82		raw_spin_lock_irqsave(&pcs->lock, flags);
    83		overflow = gpt_readl(pcs->base, TIMER_CURRENT_OVERFLOW_VALUE, 0);
    84		counter = gpt_readl(pcs->base, TIMER_CURRENT_VALUE, 0);
    85		raw_spin_unlock_irqrestore(&pcs->lock, flags);
    86	
    87		return (u64)~counter;
    88	}
    89	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (28875 bytes)