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

[kbuild test robot]

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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