[linux-rt-devel:linux-5.14.y-rt-rebase 242/262] kernel/locking/spinlock_rt.c:249:13: warning: no previous prototype for 'rt_rwlock_is_contended'

[linux-rt-devel:linux-5.14.y-rt-rebase 242/262] kernel/locking/spinlock_rt.c:249:13: warning: no previous prototype for 'rt_rwlock_is_contended'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.14.y-rt-rebase
head:   654401743eaa08fb02fd57e7ca86dfeb16a8264f
commit: 4e1854e1da111e0c0c6bf1969677f61abdbb4363 [242/262] x86: Allow to enable RT
config: x86_64-randconfig-a012-20210905 (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/rt/linux-rt-devel.git/commit/?id=4e1854e1da111e0c0c6bf1969677f61abdbb4363
        git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
        git fetch --no-tags linux-rt-devel linux-5.14.y-rt-rebase
        git checkout 4e1854e1da111e0c0c6bf1969677f61abdbb4363
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> kernel/locking/spinlock_rt.c:249:13: warning: no previous prototype for 'rt_rwlock_is_contended' [-Wmissing-prototypes]
     249 | int __sched rt_rwlock_is_contended(rwlock_t *rwlock)
         |             ^~~~~~~~~~~~~~~~~~~~~~


vim +/rt_rwlock_is_contended +249 kernel/locking/spinlock_rt.c

ca72c3eba593af Thomas Gleixner 2021-08-15  248  
ca72c3eba593af Thomas Gleixner 2021-08-15 @249  int __sched rt_rwlock_is_contended(rwlock_t *rwlock)
ca72c3eba593af Thomas Gleixner 2021-08-15  250  {
ca72c3eba593af Thomas Gleixner 2021-08-15  251  	return rw_base_is_contended(&rwlock->rwbase);
ca72c3eba593af Thomas Gleixner 2021-08-15  252  }
ca72c3eba593af Thomas Gleixner 2021-08-15  253  EXPORT_SYMBOL(rt_rwlock_is_contended);
ca72c3eba593af Thomas Gleixner 2021-08-15  254  

:::::: The code at line 249 was first introduced by commit
:::::: ca72c3eba593af8b6cce096b656c6cebd412d9b6 locking/rwlock: Provide RT variant

:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

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

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Re: [linux-rt-devel:linux-5.14.y-rt-rebase 242/262] kernel/locking/spinlock_rt.c:249:13: warning: no previous prototype for 'rt_rwlock_is_contended'

[Sebastian Andrzej Siewior]

On 2021-09-05 03:00:56 [+0800], kernel test robot wrote:
> >> kernel/locking/spinlock_rt.c:249:13: warning: no previous prototype for 'rt_rwlock_is_contended' [-Wmissing-prototypes]
>      249 | int __sched rt_rwlock_is_contended(rwlock_t *rwlock)
>          |             ^~~~~~~~~~~~~~~~~~~~~~
> 
> 
> vim +/rt_rwlock_is_contended +249 kernel/locking/spinlock_rt.c
> 
> ca72c3eba593af Thomas Gleixner 2021-08-15  248  
> ca72c3eba593af Thomas Gleixner 2021-08-15 @249  int __sched rt_rwlock_is_contended(rwlock_t *rwlock)
> ca72c3eba593af Thomas Gleixner 2021-08-15  250  {
> ca72c3eba593af Thomas Gleixner 2021-08-15  251  	return rw_base_is_contended(&rwlock->rwbase);
> ca72c3eba593af Thomas Gleixner 2021-08-15  252  }
> ca72c3eba593af Thomas Gleixner 2021-08-15  253  EXPORT_SYMBOL(rt_rwlock_is_contended);
> ca72c3eba593af Thomas Gleixner 2021-08-15  254  

| $ git grep rwlock_is_contended include/linux/rwlock_rt.h  
| include/linux/rwlock_rt.h:#define rwlock_is_contended(lock)             (((void)(lock), 0))

shouldn't we wire it up?

Sebastian