tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dd860052c99b1e088352bdd4fb7aef46f8d2ef47
commit: fba8a8674f68a0628abae470dfcfbcb4a0d7a79e RISC-V: Add kexec support
date:   12 days ago
config: riscv-randconfig-r001-20210508 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 1312852040b3190a6cb7d7c1f61fe95a5e930d8d)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fba8a8674f68a0628abae470dfcfbcb4a0d7a79e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout fba8a8674f68a0628abae470dfcfbcb4a0d7a79e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 

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/riscv/kernel/machine_kexec.c:126:6: warning: no previous prototype for function 'machine_shutdown' [-Wmissing-prototypes]
   void machine_shutdown(void)
        ^
   arch/riscv/kernel/machine_kexec.c:126:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void machine_shutdown(void)
   ^
   static 
>> arch/riscv/kernel/machine_kexec.c:148:1: warning: no previous prototype for function 'machine_crash_shutdown' [-Wmissing-prototypes]
   machine_crash_shutdown(struct pt_regs *regs)
   ^
   arch/riscv/kernel/machine_kexec.c:147:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void
   ^
   static 
   2 warnings generated.


vim +/machine_shutdown +126 arch/riscv/kernel/machine_kexec.c

   117	
   118	
   119	/*
   120	 * machine_shutdown - Prepare for a kexec reboot
   121	 *
   122	 * This function is called by kernel_kexec just before machine_kexec
   123	 * below. Its goal is to prepare the rest of the system (the other
   124	 * harts and possibly devices etc) for a kexec reboot.
   125	 */
 > 126	void machine_shutdown(void)
   127	{
   128		/*
   129		 * No more interrupts on this hart
   130		 * until we are back up.
   131		 */
   132		local_irq_disable();
   133	
   134	#if defined(CONFIG_HOTPLUG_CPU)
   135		smp_shutdown_nonboot_cpus(smp_processor_id());
   136	#endif
   137	}
   138	
   139	/**
   140	 * machine_crash_shutdown - Prepare to kexec after a kernel crash
   141	 *
   142	 * This function is called by crash_kexec just before machine_kexec
   143	 * below and its goal is similar to machine_shutdown, but in case of
   144	 * a kernel crash. Since we don't handle such cases yet, this function
   145	 * is empty.
   146	 */
   147	void
 > 148	machine_crash_shutdown(struct pt_regs *regs)
   149	{
   150	}
   151	

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