[PATCH] powerpc/mm/book3s64/hash: Update 4k PAGE_SIZE kernel mapping

[Christoph Hellwig]

On Wed, Oct 16, 2019 at 11:21:30AM +0530, Aneesh Kumar K.V wrote:
> With commit: 0034d395f89d ("powerpc/mm/hash64: Map all the kernel
> regions in the same 0xc range"), kernel now split the 64TB address range
> into 4 contexts each of 16TB. That implies we can do only 16TB linear
> mapping. This results in boot failure on some P9 systems.
> 
> Fix this by redoing the hash 4k mapping as below.
> 
>  vmalloc start     = 0xd000000000000000
>  IO start          = 0xd000380000000000
>  vmemmap start     = 0xf000000000000000
> 
> Vmalloc area is now 56TB in size and IO remap 8TB.

Btw, is there any good reason to keep the vmalloc and ioremap ranges
separate on powerpc?  Most architectures just use the low-level vmap
code to implement both and share a range.