Re: Regression in v4.2-rc1: vmalloc_to_page with ioremap

[Ashutosh Dixit <ashutosh.dixit@intel.com>]

On Tue, Jul 21 2015 at 01:39:10 PM, Toshi Kani <toshi.kani@hp.com> wrote:
>
> You can do the following instead.  If you have the physical address already
> (i.e. the address you passed to ioremap), you can skip slow_virt_to_phys().
>  pfn_to_page() is a hack for the time being so that you can use the same
> DMA mapping APIs.
>
>   phys = slow_virt_to_phys(vaddr);
>   page = pfn_to_page(phys >> PAGE_SHIFT);
>
> Dan is working on the change to introduce __pfn_t.  With this change, you
> can pass a pfn, instead of a fake page pointer, to APIs.  You may want to
> check if your APIs are covered in this change.
> https://lkml.org/lkml/2015/6/5/802

Thanks, we can do this for now till Dan's changes come online. Also, we
already have the physical address. We will submit a patch with this
change.

Ashutosh