[RFC v6 36/62] mm: introduce arch_pkeys_enabled()

[Ram Pai]

Only the architecture knows if it supports protection keys.
Hence introducing arch_pkeys_enabled().

This function is needed by arch neutral code.

One use case is -- to determine if the
	protection key needs to be displayed in smaps.

Signed-off-by: Ram Pai <linuxram at us.ibm.com>
---
 include/linux/pkeys.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/include/linux/pkeys.h b/include/linux/pkeys.h
index a1bacf1..d120810 100644
--- a/include/linux/pkeys.h
+++ b/include/linux/pkeys.h
@@ -34,6 +34,11 @@ static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
 	return 0;
 }
 
+static inline bool arch_pkeys_enabled(void)
+{
+	return false;
+}
+
 static inline void copy_init_pkru_to_fpregs(void)
 {
 }
-- 
1.7.1