[android-common:android16-6.12-desktop 3/3] fs/fs-writeback.c:138:6: warning: no previous prototype for 'wb_wakeup'

[android-common:android16-6.12-desktop 3/3] fs/fs-writeback.c:138:6: warning: no previous prototype for 'wb_wakeup'

[kernel test robot]

tree:   https://android.googlesource.com/kernel/common android16-6.12-desktop
head:   ca5266bc32d9bcf538401ef062b30e072e28c88a
commit: 55cf94258af72fd493779ab2b7a4278d5c8d1d21 [3/3] ANDROID: writeback: export symbols to do a hierarchical writeback control
config: arm-randconfig-002-20250314 (https://download.01.org/0day-ci/archive/20250314/202503140959.QKcmQiug-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250314/202503140959.QKcmQiug-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503140959.QKcmQiug-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/fs-writeback.c:138:6: warning: no previous prototype for 'wb_wakeup' [-Wmissing-prototypes]
     138 | void wb_wakeup(struct bdi_writeback *wb)
         |      ^~~~~~~~~
>> fs/fs-writeback.c:1349:6: warning: no previous prototype for 'redirty_tail_locked' [-Wmissing-prototypes]
    1349 | void redirty_tail_locked(struct inode *inode, struct bdi_writeback *wb)
         |      ^~~~~~~~~~~~~~~~~~~


vim +/wb_wakeup +138 fs/fs-writeback.c

   137	
 > 138	void wb_wakeup(struct bdi_writeback *wb)
   139	{
   140		spin_lock_irq(&wb->work_lock);
   141		if (test_bit(WB_registered, &wb->state))
   142			mod_delayed_work(bdi_wq, &wb->dwork, 0);
   143		spin_unlock_irq(&wb->work_lock);
   144	}
   145	EXPORT_SYMBOL_GPL(wb_wakeup);
   146	

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https://github.com/intel/lkp-tests/wiki