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SubjectRe: Regression in v4.2-rc1: vmalloc_to_page with ioremap
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On Wed, 2015-07-22 at 00:13 -0700, Ashutosh Dixit wrote:
> 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.

Sounds great. Thanks,
-Toshi


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