Groups > linux.kernel > #1190039

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

From	Toshi Kani <toshi.kani@hp.com>
Newsgroups	linux.kernel
Subject	Re: Regression in v4.2-rc1: vmalloc_to_page with ioremap
Date	2015-07-22 17:00 +0200
Message-ID	<pP3F0-1wt-21@gated-at.bofh.it> (permalink)
References	(3 earlier) <pOo8N-Vo-7@gated-at.bofh.it> <pOoVc-25g-37@gated-at.bofh.it> <pOHuO-3DX-13@gated-at.bofh.it> <pOME9-2rQ-7@gated-at.bofh.it> <pOWtQ-8ib-11@gated-at.bofh.it>
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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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Re: Regression in v4.2-rc1: vmalloc_to_page with ioremap Ashutosh Dixit <ashutosh.dixit@intel.com> - 2015-07-20 20:40 +0200
  Re: Regression in v4.2-rc1: vmalloc_to_page with ioremap Ashutosh Dixit <ashutosh.dixit@intel.com> - 2015-07-22 09:20 +0200
    Re: Regression in v4.2-rc1: vmalloc_to_page with ioremap Toshi Kani <toshi.kani@hp.com> - 2015-07-22 17:00 +0200

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