um: expose number of page table levels

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 <kirill.shutemov@linux.intel.com>
Acked-by: Richard Weinberger <richard@nod.at>
Cc: Jeff Dike <jdike@addtoit.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/um/Kconfig.um b/arch/um/Kconfig.um
index a7520c90f62df53981d57dea1d1a3b90f0958ff8..5dbfe3d9107c83356efa99733739630eb43d0eaa 100644 (file)
--- a/arch/um/Kconfig.um
+++ b/arch/um/Kconfig.um
@@ -155,3 +155,8 @@ config MMAPPER
 
 config NO_DMA
        def_bool y
+
+config PGTABLE_LEVELS
+       int
+       default 3 if 3_LEVEL_PGTABLES
+       default 2