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

From: Paul E. McKenney
Date: Thu Sep 02 2021 - 18:11:28 EST


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@xxxxxxxxx>
>
> 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@xxxxxxxxxxxx