MIPS: Two-level pagetables for 64-bit kernels with 64KB pages.

For 64-bit kernels with 64KB pages and two level page tables, there are
42 bits worth of virtual address space This is larger than the 40 bits of
virtual address space obtained with the default 4KB Page size and three
levels, so there are no draw backs for using two level tables with this
configuration.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/761/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index 2c1e1d02338b..ca6c83218caa 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -188,11 +188,15 @@ void output_mm_defines(void)
         DEFINE(_PTE_T_SIZE, sizeof(pte_t));
         BLANK();
         DEFINE(_PGD_T_LOG2, PGD_T_LOG2);
+#ifndef __PAGETABLE_PMD_FOLDED
         DEFINE(_PMD_T_LOG2, PMD_T_LOG2);
+#endif
         DEFINE(_PTE_T_LOG2, PTE_T_LOG2);
         BLANK();
         DEFINE(_PGD_ORDER, PGD_ORDER);
+#ifndef __PAGETABLE_PMD_FOLDED
         DEFINE(_PMD_ORDER, PMD_ORDER);
+#endif
         DEFINE(_PTE_ORDER, PTE_ORDER);
         BLANK();
         DEFINE(_PMD_SHIFT, PMD_SHIFT);