linux-kernel - Re: Regression in v4.2-rc1: vmalloc_to

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Message-ID: <tnm1tfv4gzmus.fsf@mic-login.pdx.intel.com>
Date:	Wed, 22 Jul 2015 00:13:15 -0700
From:	Ashutosh Dixit <ashutosh.dixit@...el.com>
To:	Toshi Kani <toshi.kani@...com>
Cc:	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"Dutt\, Sudeep" <sudeep.dutt@...el.com>,
	"Rao\, Nikhil" <nikhil.rao@...el.com>,
	"Williams\, Dan J" <dan.j.williams@...el.com>
Subject: Re: Regression in v4.2-rc1: vmalloc_to_page with ioremap

On Tue, Jul 21 2015 at 01:39:10 PM, Toshi Kani <toshi.kani@...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
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