drivers/ntb/hw/amd/ntb_hw_amd.c:367:29: sparse: cast removes address space of expression

[kbuild test robot <fengguang.wu@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6b5f04b6cf8ebab9a65d9c0026c650bb2538fd0f
commit: a1b3695820aa490e58915d720a1438069813008b NTB: Add support for AMD PCI-Express Non-Transparent Bridge
date:   8 weeks ago
reproduce:
        # apt-get install sparse
        git checkout a1b3695820aa490e58915d720a1438069813008b
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/ntb/hw/amd/ntb_hw_amd.c:367:29: sparse: cast removes address space of expression
   drivers/ntb/hw/amd/ntb_hw_amd.c:427:31: sparse: cast removes address space of expression

vim +367 drivers/ntb/hw/amd/ntb_hw_amd.c

   351	
   352		spin_lock_irqsave(&ndev->db_mask_lock, flags);
   353		ndev->db_mask &= ~db_bits;
   354		writew((u16)ndev->db_mask, mmio + AMD_DBMASK_OFFSET);
   355		spin_unlock_irqrestore(&ndev->db_mask_lock, flags);
   356	
   357		return 0;
   358	}
   359	
   360	static int amd_ntb_peer_db_addr(struct ntb_dev *ntb,
   361					phys_addr_t *db_addr,
   362					resource_size_t *db_size)
   363	{
   364		struct amd_ntb_dev *ndev = ntb_ndev(ntb);
   365	
   366		if (db_addr)
 > 367			*db_addr = (phys_addr_t)(ndev->peer_mmio + AMD_DBREQ_OFFSET);
   368		if (db_size)
   369			*db_size = sizeof(u32);
   370	
   371		return 0;
   372	}
   373	
   374	static int amd_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
   375	{

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