arch/x86/entry/common.c:736:24: warning: no previous prototype for 'xen_pv_evtchn_do_upcall'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   521a547ced6477c54b4b0cc206000406c221b4d6
commit: 2f6474e4636bcc68af6c44abb2703f12d7f083da x86/entry: Switch XEN/PV hypercall entry to IDTENTRY
date:   2 years, 3 months ago
config: x86_64-randconfig-r016-20220919 (https://download.01.org/0day-ci/archive/20220920/202209202208.CpsEyXIp-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2f6474e4636bcc68af6c44abb2703f12d7f083da
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 2f6474e4636bcc68af6c44abb2703f12d7f083da
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/entry/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

Note: functions only called from assembly code should be annotated with the asmlinkage attribute
All warnings (new ones prefixed by >>):

   arch/x86/entry/common.c:274:24: warning: no previous prototype for 'prepare_exit_to_usermode' [-Wmissing-prototypes]
     274 | __visible noinstr void prepare_exit_to_usermode(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/entry/common.c:336:24: warning: no previous prototype for 'syscall_return_slowpath' [-Wmissing-prototypes]
     336 | __visible noinstr void syscall_return_slowpath(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/entry/common.c:736:24: warning: no previous prototype for 'xen_pv_evtchn_do_upcall' [-Wmissing-prototypes]
     736 | __visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~~~~~~


vim +/xen_pv_evtchn_do_upcall +736 arch/x86/entry/common.c

   735	
 > 736	__visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs)

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