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Date:   Tue, 30 Oct 2012 10:36:39 -0700
From:   David Daney <ddaney.cavm@gmail.com>
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To:     "Jayachandran C." <c.jayachandran@gmail.com>,
        Ralf Baechle <ralf@linux-mips.org>
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        "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>
Subject: Re: linux 3.6.3 mips64 mtd jffs2 unmount issue
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On 10/30/2012 01:09 AM, Jayachandran C. wrote:
[...]

>
> We had seen the same issue here, and worked around it the same way
> (i.e use dynamic allocation for the backing dev structures).
>
> I ran across a similar issue in using built-in DTB (basically, kernel
> data address does not work for virt_to_phys/phys_to_virt in 64-bit
> when the load address is in CKSEG0).  There I did something like this:
>
> ptr = phys_to_virt(__pa(kernel_data_ptr));
>
> This works since __pa knows about CKSEG0 addresses in 64bit.
>
>

Really the proper fix is to make virt_to_phys() work.  This isn't the 
only case where we have seen failures due to this issue:


http://www.linux-mips.org/archives/linux-mips/2011-09/msg00029.html

I fixed it like this...

In io.h:

static inline unsigned long virt_to_phys(volatile const void *address)
{
	return __pa(address);
}

Really this needs to be pushed upstream by somebody.

> JC.
>
>
>