linux-kernel - [rcu:dev.2021.08.25a 98/115] kernel/time/hrtimer.c:1631:6: warning: no previous prototype for function 'hrtimer_interrupt_get

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Date:   Fri, 3 Sep 2021 07:00:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [rcu:dev.2021.08.25a 98/115] kernel/time/hrtimer.c:1631:6: warning:
 no previous prototype for function 'hrtimer_interrupt_get_debug'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2021.08.25a
head:   2ba1d046d9bc5b4496027d120e3ddcdfbb2fe9f4
commit: cf9fcdcca72481c55d41aa2fbe276a79db5f62ec [98/115] EXP cpu: Print out hrtimer_interrupt() information
config: hexagon-randconfig-r041-20210903 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c9948e9254fbb6ea00f66c7b4542311d21e060be)
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/paulmck/linux-rcu.git/commit/?id=cf9fcdcca72481c55d41aa2fbe276a79db5f62ec
        git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
        git fetch --no-tags rcu dev.2021.08.25a
        git checkout cf9fcdcca72481c55d41aa2fbe276a79db5f62ec
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon 

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 >>):

   kernel/time/hrtimer.c:120:21: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [CLOCK_REALTIME]        = HRTIMER_BASE_REALTIME,
                                     ^~~~~~~~~~~~~~~~~~~~~
   kernel/time/hrtimer.c:118:27: note: previous initialization is here
           [0 ... MAX_CLOCKS - 1]  = HRTIMER_MAX_CLOCK_BASES,
                                     ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/time/hrtimer.c:121:22: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [CLOCK_MONOTONIC]       = HRTIMER_BASE_MONOTONIC,
                                     ^~~~~~~~~~~~~~~~~~~~~~
   kernel/time/hrtimer.c:118:27: note: previous initialization is here
           [0 ... MAX_CLOCKS - 1]  = HRTIMER_MAX_CLOCK_BASES,
                                     ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/time/hrtimer.c:122:21: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [CLOCK_BOOTTIME]        = HRTIMER_BASE_BOOTTIME,
                                     ^~~~~~~~~~~~~~~~~~~~~
   kernel/time/hrtimer.c:118:27: note: previous initialization is here
           [0 ... MAX_CLOCKS - 1]  = HRTIMER_MAX_CLOCK_BASES,
                                     ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/time/hrtimer.c:123:17: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [CLOCK_TAI]             = HRTIMER_BASE_TAI,
                                     ^~~~~~~~~~~~~~~~
   kernel/time/hrtimer.c:118:27: note: previous initialization is here
           [0 ... MAX_CLOCKS - 1]  = HRTIMER_MAX_CLOCK_BASES,
                                     ^~~~~~~~~~~~~~~~~~~~~~~
>> kernel/time/hrtimer.c:1631:6: warning: no previous prototype for function 'hrtimer_interrupt_get_debug' [-Wmissing-prototypes]
   void hrtimer_interrupt_get_debug(int cpu, unsigned short *nr_hangs, ktime_t *delta)
        ^
   kernel/time/hrtimer.c:1631:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void hrtimer_interrupt_get_debug(int cpu, unsigned short *nr_hangs, ktime_t *delta)
   ^
   static 
   kernel/time/hrtimer.c:147:20: warning: unused function 'is_migration_base' [-Wunused-function]
   static inline bool is_migration_base(struct hrtimer_clock_base *base)
                      ^
   kernel/time/hrtimer.c:1734:20: warning: unused function '__hrtimer_peek_ahead_timers' [-Wunused-function]
   static inline void __hrtimer_peek_ahead_timers(void)
                      ^
   7 warnings generated.


vim +/hrtimer_interrupt_get_debug +1631 kernel/time/hrtimer.c

  1630	
> 1631	void hrtimer_interrupt_get_debug(int cpu, unsigned short *nr_hangs, ktime_t *delta)
  1632	{
  1633		*nr_hangs = READ_ONCE(per_cpu(hrtimer_bases, cpu).nr_hangs);
  1634		*delta = READ_ONCE(per_cpu(hrtimer_interrupt_delta, cpu));
  1635	}
  1636	

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

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