[peterz-queue:sched/cleanup 3/4] kernel/irq_work.c:77:6: warning: no previous prototype for 'irq_work_sync'

[peterz-queue:sched/cleanup 3/4] kernel/irq_work.c:77:6: warning: no previous prototype for 'irq_work_sync'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/cleanup
head:   05dd40f3f6f4b06c16b9ad246e5a5523f10b4dff
commit: 4e9ca7bd5bf21558cd143c975d0b636433548b98 [3/4] irq_work: Provide irq_work_queue_remote()
config: arm64-allnoconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
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/peterz/queue.git/commit/?id=4e9ca7bd5bf21558cd143c975d0b636433548b98
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue sched/cleanup
        git checkout 4e9ca7bd5bf21558cd143c975d0b636433548b98
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arm64 

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/irq_work.c:77:6: warning: no previous prototype for 'irq_work_sync' [-Wmissing-prototypes]
      77 | void irq_work_sync(struct irq_work *work)
         |      ^~~~~~~~~~~~~


vim +/irq_work_sync +77 kernel/irq_work.c

    72	
    73	/*
    74	 * Synchronize against the irq_work @entry, ensures the entry is not
    75	 * currently in use.
    76	 */
  > 77	void irq_work_sync(struct irq_work *work)
    78	{
    79		lockdep_assert_irqs_enabled();
    80	
    81		while (irq_work_is_busy(work))
    82			cpu_relax();
    83	}
    84	EXPORT_SYMBOL_GPL(irq_work_sync);
    85	

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

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