[RFC v7 01/25] powerpc: define an additional vma bit for protection keys.

[Ram Pai <linuxram@us.ibm.com>]

powerpc needs an additional vma bit to support 32 keys.
Till the additional vma bit lands in include/linux/mm.h
we have to define  it  in powerpc specific header file.
This is  needed to get pkeys working on power.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
 arch/powerpc/include/asm/pkeys.h |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index acad7c2..4ccb8f5 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -2,6 +2,24 @@
 #define _ASM_PPC64_PKEYS_H
 
 extern bool pkey_inited;
+
+/*
+ * powerpc needs an additional vma bit to support 32 keys.
+ * Till the additional vma bit lands in include/linux/mm.h
+ * we have to carry the hunk below. This is  needed to get
+ * pkeys working on power. -- Ram
+ */
+#ifndef VM_HIGH_ARCH_BIT_4
+#define VM_HIGH_ARCH_BIT_4	36
+#define VM_HIGH_ARCH_4	BIT(VM_HIGH_ARCH_BIT_4)
+#define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0
+#define VM_PKEY_BIT0	VM_HIGH_ARCH_0
+#define VM_PKEY_BIT1	VM_HIGH_ARCH_1
+#define VM_PKEY_BIT2	VM_HIGH_ARCH_2
+#define VM_PKEY_BIT3	VM_HIGH_ARCH_3
+#define VM_PKEY_BIT4	VM_HIGH_ARCH_4
+#endif
+
 #define ARCH_VM_PKEY_FLAGS 0
 
 static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
-- 
1.7.1