linux-kernel - Re: [rcu:dev.2021.08.25a 99/115] kernel/time/hrtimer.c:1478:7: warning: no previous prototype for '__run_hrtimer_get

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Message-ID: <20210902221125.GQ4156@paulmck-ThinkPad-P17-Gen-1>
Date:   Thu, 2 Sep 2021 15:11:25 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [rcu:dev.2021.08.25a 99/115] kernel/time/hrtimer.c:1478:7:
 warning: no previous prototype for '__run_hrtimer_get_debug'

On Fri, Sep 03, 2021 at 06:01:47AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2021.08.25a
> head:   2ba1d046d9bc5b4496027d120e3ddcdfbb2fe9f4
> commit: b5d3ff1ac4a5c2cad4fe4c253029971886ff7fcf [99/115] EXP cpu: Print out last hrtimer handler

This is a debug-only commit, and will not go to mainline.  Plus I am
getting rid of it soon.  (Famous last words...)

							Thanx, Paul

> config: i386-tinyconfig (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=b5d3ff1ac4a5c2cad4fe4c253029971886ff7fcf
>         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 b5d3ff1ac4a5c2cad4fe4c253029971886ff7fcf
>         # save the attached .config to linux build tree
>         make W=1 ARCH=i386 
> 
> 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: initialized field overwritten [-Woverride-init]
>      120 |  [CLOCK_REALTIME] = HRTIMER_BASE_REALTIME,
>          |                     ^~~~~~~~~~~~~~~~~~~~~
>    kernel/time/hrtimer.c:120:21: note: (near initialization for 'hrtimer_clock_to_base_table[0]')
>    kernel/time/hrtimer.c:121:22: warning: initialized field overwritten [-Woverride-init]
>      121 |  [CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC,
>          |                      ^~~~~~~~~~~~~~~~~~~~~~
>    kernel/time/hrtimer.c:121:22: note: (near initialization for 'hrtimer_clock_to_base_table[1]')
>    kernel/time/hrtimer.c:122:21: warning: initialized field overwritten [-Woverride-init]
>      122 |  [CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME,
>          |                     ^~~~~~~~~~~~~~~~~~~~~
>    kernel/time/hrtimer.c:122:21: note: (near initialization for 'hrtimer_clock_to_base_table[7]')
>    kernel/time/hrtimer.c:123:17: warning: initialized field overwritten [-Woverride-init]
>      123 |  [CLOCK_TAI]  = HRTIMER_BASE_TAI,
>          |                 ^~~~~~~~~~~~~~~~
>    kernel/time/hrtimer.c:123:17: note: (near initialization for 'hrtimer_clock_to_base_table[11]')
> >> kernel/time/hrtimer.c:1478:7: warning: no previous prototype for '__run_hrtimer_get_debug' [-Wmissing-prototypes]
>     1478 | void *__run_hrtimer_get_debug(int cpu)
>          |       ^~~~~~~~~~~~~~~~~~~~~~~
>    kernel/time/hrtimer.c: In function '__run_hrtimer':
>    kernel/time/hrtimer.c:1507:7: warning: variable 'expires_in_hardirq' set but not used [-Wunused-but-set-variable]
>     1507 |  bool expires_in_hardirq;
>          |       ^~~~~~~~~~~~~~~~~~
> 
> 
> vim +/__run_hrtimer_get_debug +1478 kernel/time/hrtimer.c
> 
>   1477	
> > 1478	void *__run_hrtimer_get_debug(int cpu)
>   1479	{
>   1480		return READ_ONCE(per_cpu(__run_hrtimer_fn, cpu));
>   1481	}
>   1482	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org