sparc: 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>
Cc: "David S. Miller" <davem@davemloft.net>
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>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index efb00ec75805..e49502acbab4 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -146,6 +146,10 @@ config GENERIC_ISA_DMA
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
         def_bool y if SPARC64
 
+config PGTABLE_LEVELS
+        default 4 if 64BIT
+        default 3
+
 source "init/Kconfig"
 
 source "kernel/Kconfig.freezer"