[akpm-mm:mm-unstable /301] net/core/page_pool.c:713:71: sparse: sparse: incorrect type in argument 1 (different base types)

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   fe2c34b6ea5a0e1175c30d59bc1c28caafb02c62
commit: 7699fe82442a62ea29a3745b29dbb8ef8c42d8db [/301] mm: introduce a new page type for page pool in page type
config: x86_64-randconfig-122-20260115 (https://download.01.org/0day-ci/archive/20260116/202601161606.8RuyUh2k-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260116/202601161606.8RuyUh2k-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601161606.8RuyUh2k-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> net/core/page_pool.c:713:71: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected restricted netmem_ref [usertype] netmem @@     got unsigned long @@
   net/core/page_pool.c:713:71: sparse:     expected restricted netmem_ref [usertype] netmem
   net/core/page_pool.c:713:71: sparse:     got unsigned long
   net/core/page_pool.c:734:73: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected restricted netmem_ref [usertype] netmem @@     got unsigned long @@
   net/core/page_pool.c:734:73: sparse:     expected restricted netmem_ref [usertype] netmem
   net/core/page_pool.c:734:73: sparse:     got unsigned long

vim +713 net/core/page_pool.c

   702	
   703	void page_pool_set_pp_info(struct page_pool *pool, netmem_ref netmem)
   704	{
   705		netmem_set_pp(netmem, pool);
   706	
   707		/* XXX: Now that the offset of page_type is shared between
   708		 * struct page and net_iov, just cast the netmem to struct page
   709		 * unconditionally by clearing NET_IOV if any, no matter whether
   710		 * it comes from struct net_iov or struct page.  This should be
   711		 * adjusted once the offset is no longer shared.
   712		 */
 > 713		__SetPageNetpp(__netmem_to_page((__force unsigned long)netmem & ~NET_IOV));
   714	
   715		/* Ensuring all pages have been split into one fragment initially:
   716		 * page_pool_set_pp_info() is only called once for every page when it
   717		 * is allocated from the page allocator and page_pool_fragment_page()
   718		 * is dirtying the same cache line as the page->pp_magic above, so
   719		 * the overhead is negligible.
   720		 */
   721		page_pool_fragment_netmem(netmem, 1);
   722		if (pool->has_init_callback)
   723			pool->slow.init_callback(netmem, pool->slow.init_arg);
   724	}
   725	

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