[sashal-stable:pending-5.10 389/399] arch/powerpc/kernel/smp.c:611:6: warning: no previous prototype for function 'crash_smp_send_stop'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git pending-5.10
head:   929e0c4ef688344580bfb57a585b24b1d99a5064
commit: cdf962f344e1e3f76f392fce8eb84e2547842e62 [389/399] powerpc: handle kdump appropriately with crash_kexec_post_notifiers option
config: powerpc-randconfig-r005-20220123 (https://download.01.org/0day-ci/archive/20220124/202201241635.seiM4ELp-lkp(a)intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/commit/?id=cdf962f344e1e3f76f392fce8eb84e2547842e62
        git remote add sashal-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git
        git fetch --no-tags sashal-stable pending-5.10
        git checkout cdf962f344e1e3f76f392fce8eb84e2547842e62
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kernel/

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/powerpc/kernel/smp.c:551:6: warning: no previous prototype for function 'tick_broadcast' [-Wmissing-prototypes]
   void tick_broadcast(const struct cpumask *mask)
        ^
   arch/powerpc/kernel/smp.c:551:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tick_broadcast(const struct cpumask *mask)
   ^
   static 
   arch/powerpc/kernel/smp.c:561:6: warning: no previous prototype for function 'debugger_ipi_callback' [-Wmissing-prototypes]
   void debugger_ipi_callback(struct pt_regs *regs)
        ^
   arch/powerpc/kernel/smp.c:561:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void debugger_ipi_callback(struct pt_regs *regs)
   ^
   static 
>> arch/powerpc/kernel/smp.c:611:6: warning: no previous prototype for function 'crash_smp_send_stop' [-Wmissing-prototypes]
   void crash_smp_send_stop(void)
        ^
   arch/powerpc/kernel/smp.c:611:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void crash_smp_send_stop(void)
   ^
   static 
   arch/powerpc/kernel/smp.c:1410:7: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
           bool ret;
                ^
   4 warnings generated.


vim +/crash_smp_send_stop +611 arch/powerpc/kernel/smp.c

   559	
   560	#ifdef CONFIG_DEBUGGER
 > 561	void debugger_ipi_callback(struct pt_regs *regs)
   562	{
   563		debugger_ipi(regs);
   564	}
   565	
   566	void smp_send_debugger_break(void)
   567	{
   568		smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, debugger_ipi_callback, 1000000);
   569	}
   570	#endif
   571	
   572	#ifdef CONFIG_KEXEC_CORE
   573	void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
   574	{
   575		int cpu;
   576	
   577		smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, crash_ipi_callback, 1000000);
   578		if (kdump_in_progress() && crash_wake_offline) {
   579			for_each_present_cpu(cpu) {
   580				if (cpu_online(cpu))
   581					continue;
   582				/*
   583				 * crash_ipi_callback will wait for
   584				 * all cpus, including offline CPUs.
   585				 * We don't care about nmi_ipi_function.
   586				 * Offline cpus will jump straight into
   587				 * crash_ipi_callback, we can skip the
   588				 * entire NMI dance and waiting for
   589				 * cpus to clear pending mask, etc.
   590				 */
   591				do_smp_send_nmi_ipi(cpu, false);
   592			}
   593		}
   594	}
   595	#endif
   596	
   597	#ifdef CONFIG_NMI_IPI
   598	static void crash_stop_this_cpu(struct pt_regs *regs)
   599	#else
   600	static void crash_stop_this_cpu(void *dummy)
   601	#endif
   602	{
   603		/*
   604		 * Just busy wait here and avoid marking CPU as offline to ensure
   605		 * register data is captured appropriately.
   606		 */
   607		while (1)
   608			cpu_relax();
   609	}
   610	
 > 611	void crash_smp_send_stop(void)
   612	{
   613		static bool stopped = false;
   614	
   615		if (stopped)
   616			return;
   617	
   618		stopped = true;
   619	

---
0-DAY CI Kernel Test Service, Intel Corporation
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