[tglx-devel:x86/entry 12/16] arch/x86/kernel/signal.c:806:6: warning: no previous prototype for function 'arch_do_signal'

[tglx-devel:x86/entry 12/16] arch/x86/kernel/signal.c:806:6: warning: no previous prototype for function 'arch_do_signal'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/entry
head:   a55e3844bc8afc350ee4efd87442c9c74f101b34
commit: 0e43d3bd147e265b320614052d684f1a4767fd1f [12/16] x86/entry: Use generic syscall exit functionality
config: x86_64-randconfig-r025-20200719 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 3504acc33e8b9ddd7de71d75cdc329a14dbf58d9)
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
        git checkout 0e43d3bd147e265b320614052d684f1a4767fd1f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>):

>> arch/x86/kernel/signal.c:806:6: warning: no previous prototype for function 'arch_do_signal' [-Wmissing-prototypes]
   void arch_do_signal(struct pt_regs *regs)
        ^
   arch/x86/kernel/signal.c:806:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void arch_do_signal(struct pt_regs *regs)
   ^
   static 
   1 warning generated.

vim +/arch_do_signal +806 arch/x86/kernel/signal.c

   800	
   801	/*
   802	 * Note that 'init' is a special process: it doesn't get signals it doesn't
   803	 * want to handle. Thus you cannot kill init even with a SIGKILL even by
   804	 * mistake.
   805	 */
 > 806	void arch_do_signal(struct pt_regs *regs)
   807	{
   808		struct ksignal ksig;
   809	
   810		if (get_signal(&ksig)) {
   811			/* Whee! Actually deliver the signal.  */
   812			handle_signal(&ksig, regs);
   813			return;
   814		}
   815	
   816		/* Did we come from a system call? */
   817		if (syscall_get_nr(current, regs) >= 0) {
   818			/* Restart the system call - no handlers present */
   819			switch (syscall_get_error(current, regs)) {
   820			case -ERESTARTNOHAND:
   821			case -ERESTARTSYS:
   822			case -ERESTARTNOINTR:
   823				regs->ax = regs->orig_ax;
   824				regs->ip -= 2;
   825				break;
   826	
   827			case -ERESTART_RESTARTBLOCK:
   828				regs->ax = get_nr_restart_syscall(regs);
   829				regs->ip -= 2;
   830				break;
   831			}
   832		}
   833	
   834		/*
   835		 * If there's no signal to deliver, we just put the saved sigmask
   836		 * back.
   837		 */
   838		restore_saved_sigmask();
   839	}
   840	

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

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