[rgushchin:kmemcg_id 107/199] drivers/mtd/devices/mtdram.c:77:11: error: implicit declaration of function '__pfn_to_phys'

[rgushchin:kmemcg_id 107/199] drivers/mtd/devices/mtdram.c:77:11: error: implicit declaration of function '__pfn_to_phys'

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 3957 bytes --]

tree:   https://github.com/rgushchin/linux.git kmemcg_id
head:   2da7aac20bf18ad6bfd59b256f9295263a11310e
commit: 5517b8a8293b9e01205cf58dc884191a110aff29 [107/199] m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM
config: m68k-randconfig-r033-20201110 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
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://github.com/rgushchin/linux/commit/5517b8a8293b9e01205cf58dc884191a110aff29
        git remote add rgushchin https://github.com/rgushchin/linux.git
        git fetch --no-tags rgushchin kmemcg_id
        git checkout 5517b8a8293b9e01205cf58dc884191a110aff29
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

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

All errors (new ones prefixed by >>):

   drivers/mtd/devices/mtdram.c: In function 'ram_point':
>> drivers/mtd/devices/mtdram.c:77:11: error: implicit declaration of function '__pfn_to_phys' [-Werror=implicit-function-declaration]
      77 |   *phys = __pfn_to_phys(pfn0) + page_ofs;
         |           ^~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/__pfn_to_phys +77 drivers/mtd/devices/mtdram.c

^1da177e4c3f415 Linus Torvalds 2005-04-16  64  
c13cbf3b5086d4e Joern Engel    2005-04-21  65  static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
a98889f3d888299 Jared Hulbert  2008-04-29  66  		size_t *retlen, void **virt, resource_size_t *phys)
^1da177e4c3f415 Linus Torvalds 2005-04-16  67  {
a98889f3d888299 Jared Hulbert  2008-04-29  68  	*virt = mtd->priv + from;
^1da177e4c3f415 Linus Torvalds 2005-04-16  69  	*retlen = len;
877b58ebc038f5e Nicolas Pitre  2017-10-30  70  
877b58ebc038f5e Nicolas Pitre  2017-10-30  71  	if (phys) {
877b58ebc038f5e Nicolas Pitre  2017-10-30  72  		/* limit retlen to the number of contiguous physical pages */
877b58ebc038f5e Nicolas Pitre  2017-10-30  73  		unsigned long page_ofs = offset_in_page(*virt);
877b58ebc038f5e Nicolas Pitre  2017-10-30  74  		void *addr = *virt - page_ofs;
877b58ebc038f5e Nicolas Pitre  2017-10-30  75  		unsigned long pfn1, pfn0 = vmalloc_to_pfn(addr);
877b58ebc038f5e Nicolas Pitre  2017-10-30  76  
877b58ebc038f5e Nicolas Pitre  2017-10-30 @77  		*phys = __pfn_to_phys(pfn0) + page_ofs;
877b58ebc038f5e Nicolas Pitre  2017-10-30  78  		len += page_ofs;
877b58ebc038f5e Nicolas Pitre  2017-10-30  79  		while (len > PAGE_SIZE) {
877b58ebc038f5e Nicolas Pitre  2017-10-30  80  			len -= PAGE_SIZE;
877b58ebc038f5e Nicolas Pitre  2017-10-30  81  			addr += PAGE_SIZE;
877b58ebc038f5e Nicolas Pitre  2017-10-30  82  			pfn0++;
877b58ebc038f5e Nicolas Pitre  2017-10-30  83  			pfn1 = vmalloc_to_pfn(addr);
877b58ebc038f5e Nicolas Pitre  2017-10-30  84  			if (pfn1 != pfn0) {
877b58ebc038f5e Nicolas Pitre  2017-10-30  85  				*retlen = addr - *virt;
877b58ebc038f5e Nicolas Pitre  2017-10-30  86  				break;
877b58ebc038f5e Nicolas Pitre  2017-10-30  87  			}
877b58ebc038f5e Nicolas Pitre  2017-10-30  88  		}
877b58ebc038f5e Nicolas Pitre  2017-10-30  89  	}
877b58ebc038f5e Nicolas Pitre  2017-10-30  90  
^1da177e4c3f415 Linus Torvalds 2005-04-16  91  	return 0;
^1da177e4c3f415 Linus Torvalds 2005-04-16  92  }
^1da177e4c3f415 Linus Torvalds 2005-04-16  93  

:::::: The code at line 77 was first introduced by commit
:::::: 877b58ebc038f5e3f0afc5674fc35db75eaaa117 mtd: mtdram: properly handle the phys argument in the point method

:::::: TO: Nicolas Pitre <nicolas.pitre@linaro.org>
:::::: CC: Richard Weinberger <richard@nod.at>

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

[-- Attachment #2: config.gz --]
[-- Type: application/gzip, Size: 22425 bytes --]