[pci:pci/resource 4/6] arch/microblaze/pci/pci-common.c:450:3: warning: passing argument 1 of 'pcibios_resource_to_bus' from incompatible pointer type

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci/resource
head:   2ad70d5e96f3945656cfca8c005384f2a858a8c5
commit: 3dbd970b6d9a96ab471b4b86650a0200a47d375d [4/6] microblaze/PCI: Implement pci_resource_to_user() with pcibios_resource_to_bus()
config: microblaze-mmu_defconfig (attached as .config)
compiler: microblaze-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 3dbd970b6d9a96ab471b4b86650a0200a47d375d
        # save the attached .config to linux build tree
        make.cross ARCH=microblaze 

All warnings (new ones prefixed by >>):

   arch/microblaze/pci/pci-common.c: In function 'pci_resource_to_user':
>> arch/microblaze/pci/pci-common.c:450:3: warning: passing argument 1 of 'pcibios_resource_to_bus' from incompatible pointer type
      pcibios_resource_to_bus(dev, &region, rsrc);
      ^
   In file included from arch/microblaze/pci/pci-common.c:20:0:
   include/linux/pci.h:804:6: note: expected 'struct pci_bus *' but argument is of type 'const struct pci_dev *'
    void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
         ^
>> arch/microblaze/pci/pci-common.c:450:3: warning: passing argument 3 of 'pcibios_resource_to_bus' discards 'const' qualifier from pointer target type
      pcibios_resource_to_bus(dev, &region, rsrc);
      ^
   In file included from arch/microblaze/pci/pci-common.c:20:0:
   include/linux/pci.h:804:6: note: expected 'struct resource *' but argument is of type 'const struct resource *'
    void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
         ^

vim +/pcibios_resource_to_bus +450 arch/microblaze/pci/pci-common.c

   434		pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset);
   435	
   436		vma->vm_pgoff = offset >> PAGE_SHIFT;
   437		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
   438		return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
   439				       vma->vm_end - vma->vm_start,
   440				       vma->vm_page_prot);
   441	}
   442	
   443	void pci_resource_to_user(const struct pci_dev *dev, int bar,
   444				  const struct resource *rsrc,
   445				  resource_size_t *start, resource_size_t *end)
   446	{
   447		struct pci_bus_region region;
   448	
   449		if (rsrc->flags & IORESOURCE_IO) {
 > 450			pcibios_resource_to_bus(dev, &region, rsrc);
   451			*start = region.start;
   452			*end = region.end;
   453			return;
   454		}
   455	
   456		/* We pass a CPU physical address to userland for MMIO instead of a
   457		 * BAR value because X is lame and expects to be able to use that
   458		 * to pass to /dev/mem!

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