[linux-stable-rc:linux-4.19.y 1833/4026] drivers/xen/events/events_base.o: warning: objtool: xen_evtchn_cpu_dead()+0x14: unreachable instruction

[linux-stable-rc:linux-4.19.y 1833/4026] drivers/xen/events/events_base.o: warning: objtool: xen_evtchn_cpu_dead()+0x14: unreachable instruction

[kernel test robot]

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TO: Juergen Gross <jgross@suse.com>
CC: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Wei Liu <wl@xen.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y
head:   1bd8f1c8ad2f0ad5fd897ee7e37f81b867d78b5a
commit: 17ef715c0c88fe2df485fba68aa7c6c6cb3004f9 [1833/4026] xen/events: defer eoi in case of excessive number of events
config: x86_64-randconfig-a005-20210504 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8f5a2a5836cc8e4c1def2bdeb022e7b496623439)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=17ef715c0c88fe2df485fba68aa7c6c6cb3004f9
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.19.y
        git checkout 17ef715c0c88fe2df485fba68aa7c6c6cb3004f9
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>):

   drivers/xen/events/events_base.c:1987:6: warning: no previous prototype for function 'xen_callback_vector' [-Wmissing-prototypes]
   void xen_callback_vector(void)
        ^
   drivers/xen/events/events_base.c:1987:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void xen_callback_vector(void)
   ^
   static 
   1 warning generated.
>> drivers/xen/events/events_base.o: warning: objtool: xen_evtchn_cpu_dead()+0x14: unreachable instruction

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

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