On Thu, Feb 16, 2017 at 05:27:34PM -0800, David Daney wrote:
> From: Alex Belits <[email protected]>
>
> Some users must have 4K pages while needing a 48-bit VA space size.
> The cleanest way do do this is to go to a 4-level page table for this
> case. Each page table level using order-0 pages adds 9 bits to the
> VA size (at 4K pages, so for four levels we get 9 * 4 + 12 == 48-bits.
>
> For the 4K page size case only we add support functions for the PUD
> level of the page table tree, also the TLB exception handlers get an
> extra level of tree walk.
>
> Signed-off-by: Alex Belits <[email protected]>
> [[email protected]] Forward port to v4.10
> Signed-off-by: David Daney <[email protected]>
Thanks folks, queued for 4.12.
While the need for 48-bit address space is not so surprising, the need
for the combination of 4K pages and 48-bit address space is!
I had some minor merge conflicts so it would be good if you could take
a look if https://git.linux-mips.org/cgit/ralf/upstream-sfr.git/commit/?id=afba1896993a0b74aa2ad3076d594e455b3af301
looks good.
Ralf