[POWERPC] Add ability to 4K kernel to hash in 64K pages

This adds the ability for a kernel compiled with 4K page size
to have special slices containing 64K pages and hash the right type
of hash PTEs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 5226f701634..ecd459dd1ba 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -546,9 +546,15 @@ config NODES_SPAN_OTHER_NODES
         def_bool y
         depends on NEED_MULTIPLE_NODES
 
+config PPC_HAS_HASH_64K
+        bool
+        depends on PPC64
+        default n
+
 config PPC_64K_PAGES
         bool "64k page size"
         depends on PPC64
+        select PPC_HAS_HASH_64K
         help
           This option changes the kernel logical page size to 64k. On machines
           without processor support for 64k pages, the kernel will simulate