linux-kernel - arch/x86/entry/common.c:736:24: warning: no previous prototype for 'xen_pv_evtchn_do

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Date:   Sat, 3 Apr 2021 21:02:28 +0800
From:   kernel test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: arch/x86/entry/common.c:736:24: warning: no previous prototype for
 'xen_pv_evtchn_do_upcall'

Hi Thomas,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d93a0d43e3d0ba9e19387be4dae4a8d5b175a8d7
commit: 2f6474e4636bcc68af6c44abb2703f12d7f083da x86/entry: Switch XEN/PV hypercall entry to IDTENTRY
date:   10 months ago
config: x86_64-randconfig-r011-20210403 (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/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 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@...el.com>

All warnings (new ones prefixed by >>):

   arch/x86/entry/common.c:59:24: warning: no previous prototype for 'enter_from_user_mode' [-Wmissing-prototypes]
      59 | __visible noinstr void enter_from_user_mode(void)
         |                        ^~~~~~~~~~~~~~~~~~~~
   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)

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

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