tree:   https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git loongarch-next
head:   c145c62399b789b70f8730e0e73f6dc4c2f9d320
commit: f35d1714098e4385732a3a6137bec6e6796e923b [16/21] LoongArch: Add kdump support
config: loongarch-randconfig-r033-20221002
compiler: loongarch64-linux-gcc (GCC) 12.1.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/commit/?id=f35d1714098e4385732a3a6137bec6e6796e923b
        git remote add chenhuacai-loongson https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git
        git fetch --no-tags chenhuacai-loongson loongarch-next
        git checkout f35d1714098e4385732a3a6137bec6e6796e923b
        # save the config file
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 ARCH=loongarch 

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

All errors (new ones prefixed by >>):

   arch/loongarch/kernel/crash_dump.c: In function 'copy_oldmem_page':
>> arch/loongarch/kernel/crash_dump.c:15:17: error: implicit declaration of function 'copy_to_iter'; did you mean 'copy_to_user'? [-Werror=implicit-function-declaration]
      15 |         csize = copy_to_iter(vaddr + offset, csize, iter);
         |                 ^~~~~~~~~~~~
         |                 copy_to_user
   cc1: some warnings being treated as errors


vim +15 arch/loongarch/kernel/crash_dump.c

     5	
     6	ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
     7				 size_t csize, unsigned long offset)
     8	{
     9		void *vaddr;
    10	
    11		if (!csize)
    12			return 0;
    13	
    14		vaddr = kmap_local_pfn(pfn);
  > 15		csize = copy_to_iter(vaddr + offset, csize, iter);

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp