linux-kernel - [RFC v6 36/62] mm: introduce arch_pkeys

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Date:   Sat, 15 Jul 2017 20:56:38 -0700
From:   Ram Pai <linuxram@...ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, dave.hansen@...el.com, hbabu@...ibm.com,
        linuxram@...ibm.com, arnd@...db.de, akpm@...ux-foundation.org,
        corbet@....net, mingo@...hat.com, mhocko@...nel.org
Subject: [RFC v6 36/62] mm: introduce arch_pkeys_enabled()

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@...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