powerpc: expose number of page table levels on Kconfig level

We would want to use number of page table level to define mm_struct.
Let's expose it as CONFIG_PGTABLE_LEVELS.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Tested-by: Guenter Roeck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 22b0940494bb5016be1fca2a98aa7b75c105487a..91ad76f30d18d56b9075ab500e072a407f2ed077 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -297,6 +297,12 @@ config ZONE_DMA32
        bool
        default y if PPC64
 
+config PGTABLE_LEVELS
+       int
+       default 2 if !PPC64
+       default 3 if PPC_64K_PAGES
+       default 4
+
 source "init/Kconfig"
 
 source "kernel/Kconfig.freezer"