[djbw-nvdimm:libnvdimm-pending 12/16] drivers/dax/mapping.c:345:15: warning: assignment to 'struct dev_pagemap *' from 'int' makes pointer from integer without a cast

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

Hi Dan,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git libnvdimm-pending
head:   ac9d6b3ba0a537b67bdc8e525308dc371da91e1b
commit: fd2e18c05d353b59283b4cb5508bafecd766b304 [12/16] devdax: Move address_space helpers to the DAX core
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20220903/202209030805.hxvdDbvK-lkp@intel.com/config)
compiler: s390-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/djbw/nvdimm.git/commit/?id=fd2e18c05d353b59283b4cb5508bafecd766b304
        git remote add djbw-nvdimm https://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git
        git fetch --no-tags djbw-nvdimm libnvdimm-pending
        git checkout fd2e18c05d353b59283b4cb5508bafecd766b304
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/dax/

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

All warnings (new ones prefixed by >>):

   drivers/dax/mapping.c: In function 'dax_associate_entry':
   drivers/dax/mapping.c:345:17: error: implicit declaration of function 'get_dev_pagemap_many'; did you mean 'put_dev_pagemap_many'? [-Werror=implicit-function-declaration]
     345 |         pgmap = get_dev_pagemap_many(pfn, NULL, PHYS_PFN(size));
         |                 ^~~~~~~~~~~~~~~~~~~~
         |                 put_dev_pagemap_many
>> drivers/dax/mapping.c:345:15: warning: assignment to 'struct dev_pagemap *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     345 |         pgmap = get_dev_pagemap_many(pfn, NULL, PHYS_PFN(size));
         |               ^
   cc1: some warnings being treated as errors


vim +345 drivers/dax/mapping.c

   324	
   325	/*
   326	 * When it is called in dax_insert_entry(), the cow flag will indicate that
   327	 * whether this entry is shared by multiple files.  If so, set the page->mapping
   328	 * FS_DAX_MAPPING_COW, and use page->index as refcount.
   329	 */
   330	static vm_fault_t dax_associate_entry(void *entry,
   331					      struct address_space *mapping,
   332					      struct vm_fault *vmf, unsigned long flags)
   333	{
   334		unsigned long size = dax_entry_size(entry), pfn, index;
   335		struct dev_pagemap *pgmap;
   336		int i = 0;
   337	
   338		if (IS_ENABLED(CONFIG_FS_DAX_LIMITED))
   339			return 0;
   340	
   341		if (!size)
   342			return 0;
   343	
   344		pfn = dax_to_pfn(entry);
 > 345		pgmap = get_dev_pagemap_many(pfn, NULL, PHYS_PFN(size));
   346		if (!pgmap)
   347			return VM_FAULT_SIGBUS;
   348	
   349		index = linear_page_index(vmf->vma, ALIGN(vmf->address, size));
   350		for_each_mapped_pfn(entry, pfn) {
   351			struct page *page = pfn_to_page(pfn);
   352	
   353			if (flags & DAX_COW) {
   354				dax_mapping_set_cow(page);
   355			} else {
   356				WARN_ON_ONCE(page->mapping);
   357				page->mapping = mapping;
   358				page->index = index + i++;
   359			}
   360		}
   361	
   362		return 0;
   363	}
   364	

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