[PATCH 2/2] riscv: kexec: Implement crash_smp_send_stop with percpu crash_save_cpu

[kernel test robot]

Hi,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.0-rc1 next-20220818]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/guoren-kernel-org/riscv-kexec-Support-crash_save-percpu-and-machine_kexec_mask_interrupts/20220816-144442
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
config: riscv-randconfig-r035-20220818 (https://download.01.org/0day-ci/archive/20220818/202208181520.fYQOePu6-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project aed5e3bea138ce581d682158eb61c27b3cfdd6ec)
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://github.com/intel-lab-lkp/linux/commit/0abdaf7e1f44634e1cee484e3cf01b7e8c851950
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review guoren-kernel-org/riscv-kexec-Support-crash_save-percpu-and-machine_kexec_mask_interrupts/20220816-144442
        git checkout 0abdaf7e1f44634e1cee484e3cf01b7e8c851950
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

>> arch/riscv/kernel/machine_kexec.c:217:7: error: call to undeclared function 'smp_crash_stop_failed'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           WARN(smp_crash_stop_failed(),
                ^
   1 error generated.


vim +/smp_crash_stop_failed +217 arch/riscv/kernel/machine_kexec.c

   193	
   194	/*
   195	 * machine_kexec - Jump to the loaded kimage
   196	 *
   197	 * This function is called by kernel_kexec which is called by the
   198	 * reboot system call when the reboot cmd is LINUX_REBOOT_CMD_KEXEC,
   199	 * or by crash_kernel which is called by the kernel's arch-specific
   200	 * trap handler in case of a kernel panic. It's the final stage of
   201	 * the kexec process where the pre-loaded kimage is ready to be
   202	 * executed. We assume at this point that all other harts are
   203	 * suspended and this hart will be the new boot hart.
   204	 */
   205	void __noreturn
   206	machine_kexec(struct kimage *image)
   207	{
   208		struct kimage_arch *internal = &image->arch;
   209		unsigned long jump_addr = (unsigned long) image->start;
   210		unsigned long first_ind_entry = (unsigned long) &image->head;
   211		unsigned long this_cpu_id = __smp_processor_id();
   212		unsigned long this_hart_id = cpuid_to_hartid_map(this_cpu_id);
   213		unsigned long fdt_addr = internal->fdt_addr;
   214		void *control_code_buffer = page_address(image->control_code_page);
   215		riscv_kexec_method kexec_method = NULL;
   216	
 > 217		WARN(smp_crash_stop_failed(),

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