[PATCH 3/3] kexec: arrange for paddr_vmcoreinfo_note() to return phys_addr_t

[Russell King - ARM Linux]

On Mon, Apr 18, 2016 at 01:38:20PM +0800, Baoquan He wrote:
> On 04/14/16 at 09:00pm, Russell King wrote:
> > On PAE systems (eg, ARM LPAE) the vmcore note may be located above
> > 4GB physical on 32-bit architectures, so we need a wider type than
> > "unsigned long" here.  Arrange for paddr_vmcoreinfo_note() to return
> > a phys_addr_t, thereby allowing it to be located above 4GB.
> 
> At first glance, it sounds great. But I can't imagine a scenario where
> on pae system kernel can be located above 4G. As far as I know i386 and
> its pae can't do this because the current linux VM implementation can't
> allow that. I am not familiar with arm system. So please correct me if
> I was wrong.

You are wrong.  That's precisely why this patch exists.

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