[PATCH 2/2] powerpc: mm: change pgtable index size for 64K page

[Liu Ping Fan]

For 64K page, we waste half of the pte_t page. With this patch, after
changing PGD_INDEX_SIZE from 12 to 11, PTE_INDEX_SIZE from 8 to 9,
we can improve the usage of pte_t page and shrink the continuous phys
size for pgd_t.

Signed-off-by: Liu Ping Fan <pingfank at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/pgtable-ppc64-64k.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/pgtable-ppc64-64k.h b/arch/powerpc/include/asm/pgtable-ppc64-64k.h
index a56b82f..f6955ff 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64-64k.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64-64k.h
@@ -4,10 +4,10 @@
 #include <asm-generic/pgtable-nopud.h>
 
 
-#define PTE_INDEX_SIZE  8
+#define PTE_INDEX_SIZE  9
 #define PMD_INDEX_SIZE  10
 #define PUD_INDEX_SIZE	0
-#define PGD_INDEX_SIZE  12
+#define PGD_INDEX_SIZE  11
 
 #ifndef __ASSEMBLY__
 #define PTE_TABLE_SIZE	(sizeof(real_pte_t) << PTE_INDEX_SIZE)
-- 
1.8.1.4