On 10/16/19 11:35 AM, Christoph Hellwig wrote:
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.
The base page size we use to map these two can be different.
-aneesh
