On Mon, Dec 02, 2024 at 10:50:07AM +0100, Dave Penkler wrote:
[ ... ]
> That is weird: the type of resource.start is resource_size_t which resolves to u32 via phys_addr_t on i386 which should be the same size as void *
> For compile check purposes simply changing iobase type to phys_addr_t the following error message appears:
>
> drivers/staging/gpib/ines/ines_gpib.c: In function 'ines_common_pci_attach':
> drivers/staging/gpib/ines/ines_gpib.c:783:28: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> 783 | nec_priv->iobase = (void *)(pci_resource_start(ines_priv->pci_device,
> | ^
> drivers/staging/gpib/ines/ines_gpib.c:783:26: error: assignment to 'phys_addr_t' {aka 'long long unsigned int'} from 'void *' makes integer from pointer without a cast [-Wint-conversion]
> 783 | nec_priv->iobase = (void *)(pci_resource_start(ines_priv->pci_device,
> | ^
>
> It would seem that for some reason phys_addr_t resolves to long long unsigned int
Check out CONFIG_X86_PAE, which adds 64-bit physical address support to
32-bit x86 images. Pointers are still 32 bit in that mode, though.
Guenter
