From: Arnd Bergmann
> Sent: 21 December 2017 16:15
>
> resource_size_t may be larger than pointers depending on configuration,
> so we can run into this build warning:
>
> drivers/virt/vboxguest/vboxguest_linux.c: In function 'vbg_pci_probe':
> drivers/virt/vboxguest/vboxguest_linux.c:295:4: error: cast to pointer from
> integer of different size
> [-Werror=int-to-pointer-cast]
> drivers/virt/vboxguest/vboxguest_linux.c:367:4: error: cast to pointer from
> integer of different size
> [-Werror=int-to-pointer-cast]
>
> This uses the special %pap to print the address by reference.
>
> Fixes: 0ba002bc4393 ("virt: Add vboxguest driver for Virtual Box Guest
> integration")
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> ---
> v2: Use %pap instead of the %rR that was just as incorrect, as
> pointed out by Joe Perches.
> ---
> drivers/virt/vboxguest/vboxguest_linux.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/virt/vboxguest/vboxguest_linux.c
> b/drivers/virt/vboxguest/vboxguest_linux.c
> index d045aa51ce03..82e280d38cc2 100644
> --- a/drivers/virt/vboxguest/vboxguest_linux.c
> +++ b/drivers/virt/vboxguest/vboxguest_linux.c
> @@ -291,8 +291,8 @@ static int vbg_pci_probe(struct pci_dev *pci, const
> struct pci_device_id *id)
>
> vmmdev = devm_ioremap(dev, mmio, mmio_len);
> if (!vmmdev) {
> - vbg_err("vboxguest: Error ioremap failed; MMIO addr=%p
> size=%d\n",
> - (void *)mmio, (int)mmio_len);
> + vbg_err("vboxguest: Error ioremap failed; MMIO addr=%pap
> size=%pap\n",
> + &mmio, &mmio_len);
Are you sure about the type of mmio_len?
While the argument to devm_ioremap() is of type resource_size_t it seems
extremely unlikely that the actual value will exceed 2^32.
Using a 64bit type for the length on 32bit systems will generate horrid code.
I can't see the code in my tree to check.
David
