[RFC PATCH 5/5] powerpc/mm/hash: Increase VA range to 256TB

[Aneesh Kumar K.V]

Not-Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/book3s/64/hash-4k.h  |  2 +-
 arch/powerpc/include/asm/book3s/64/hash-64k.h |  2 +-
 arch/powerpc/include/asm/page_64.h            |  2 +-
 arch/powerpc/include/asm/processor.h          | 12 +++++++-----
 arch/powerpc/mm/slice.c                       |  2 ++
 5 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h
index 0c4e470571ca..5b5410ca2bd0 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-4k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h
@@ -6,7 +6,7 @@
  * each entry by assuming that each entry is page aligned.
  */
 #define H_PTE_INDEX_SIZE  9
-#define H_PMD_INDEX_SIZE  7
+#define H_PMD_INDEX_SIZE  9
 #define H_PUD_INDEX_SIZE  9
 #define H_PGD_INDEX_SIZE  9
 
diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
index f3dd21efa2ea..37810b0792a5 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -4,7 +4,7 @@
 #define H_PTE_INDEX_SIZE  8
 #define H_PMD_INDEX_SIZE  5
 #define H_PUD_INDEX_SIZE  5
-#define H_PGD_INDEX_SIZE  12
+#define H_PGD_INDEX_SIZE  14
 
 #define H_PAGE_COMBO	0x00001000 /* this is a combo 4k page */
 #define H_PAGE_4K_PFN	0x00002000 /* PFN is for a single 4k page */
diff --git a/arch/powerpc/include/asm/page_64.h b/arch/powerpc/include/asm/page_64.h
index 7f72659b7999..d85ac61e2394 100644
--- a/arch/powerpc/include/asm/page_64.h
+++ b/arch/powerpc/include/asm/page_64.h
@@ -107,7 +107,7 @@ extern u64 ppc64_pft_size;
  */
 struct slice_mask {
 	u16 low_slices;
-	DECLARE_BITMAP(high_slices, 64);
+	DECLARE_BITMAP(high_slices, 256);
 };
 
 struct mm_struct;
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 1ba814436c73..37e0f3124dee 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -102,11 +102,13 @@ void release_thread(struct task_struct *);
 #endif
 
 #ifdef CONFIG_PPC64
-/* 64-bit user address space is 46-bits (64TB user VM) */
-#define TASK_SIZE_USER64 (0x0000400000000000UL)
-
-/* 
- * 32-bit user address space is 4GB - 1 page 
+/*
+ * 64-bit user address space is 48-bits (256TB user VM).
+ * Derived out of PGTABLE_RANGE
+ */
+#define TASK_SIZE_USER64 (0x0001000000000000UL)
+/*
+ * 32-bit user address space is 4GB - 1 page
  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
  */
 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 0ec750adbe7f..f194afbaf423 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -407,6 +407,8 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
 	struct mm_struct *mm = current->mm;
 	unsigned long newaddr;
 
+	/* Make sure high_slices bitmap size is same as we expected */
+	BUILD_BUG_ON(256 != SLICE_NUM_HIGH);
 	/*
 	 * init different masks
 	 */
-- 
2.7.4