[PATCH v2] /dev/mem: use phys_addr_t for physical addresses

[Greg KH]

On Wed, Sep 12, 2012 at 02:05:58PM -0400, Cyril Chemparathy wrote:
> This patch fixes the /dev/mem driver to use phys_addr_t for physical
> addresses.  This is required on PAE systems, especially those that run
> entirely out of >4G physical memory space.

What is the symptom if this patch is not applied?  Does it need to be
backported to older kernels?  If so, which ones?

thanks,

greg k-h