drivers/pci/controller/dwc/pcie-designware.c:309:52: sparse: cast truncates bits from constant value (ffffffff7fffffff becomes 7fffffff)

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   f261c4e529dac5608a604d3dd3ae1cd2adf23c89
commit: 0e11faa48b07a063289d65363015a3d51ca4c337 PCI: dwc: Make use of BIT() in 
constant definitions
date:   2 weeks ago
reproduce:
        # apt-get install sparse
        git checkout 0e11faa48b07a063289d65363015a3d51ca4c337
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'


sparse warnings: (new ones prefixed by >>)

>> drivers/pci/controller/dwc/pcie-designware.c:309:52: sparse: cast truncates 
>> bits from constant value (ffffffff7fffffff becomes 7fffffff)

vim +309 drivers/pci/controller/dwc/pcie-designware.c

   291  
   292  void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
   293                           enum dw_pcie_region_type type)
   294  {
   295          int region;
   296  
   297          switch (type) {
   298          case DW_PCIE_REGION_INBOUND:
   299                  region = PCIE_ATU_REGION_INBOUND;
   300                  break;
   301          case DW_PCIE_REGION_OUTBOUND:
   302                  region = PCIE_ATU_REGION_OUTBOUND;
   303                  break;
   304          default:
   305                  return;
   306          }
   307  
   308          dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region | index);
 > 309          dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, (u32)~PCIE_ATU_ENABLE);
   310  }
   311  

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