linux-kernel - [PATCH 6/8] x86/pkeys: Add arch_pkeys

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Message-Id: <20180508145948.9492-7-mpe@ellerman.id.au>
Date:   Wed,  9 May 2018 00:59:46 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     linuxram@...ibm.com
Cc:     mingo@...hat.com, linuxppc-dev@...abs.org, linux-mm@...ck.org,
        x86@...nel.org, linux-kernel@...r.kernel.org, dave.hansen@...el.com
Subject: [PATCH 6/8] x86/pkeys: Add arch_pkeys_enabled()

This will be used in future patches to check for arch support for
pkeys in generic code.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 arch/x86/include/asm/pkeys.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/pkeys.h b/arch/x86/include/asm/pkeys.h
index 0e5f749158e4..c1957f8f7c1b 100644
--- a/arch/x86/include/asm/pkeys.h
+++ b/arch/x86/include/asm/pkeys.h
@@ -7,6 +7,11 @@
 extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
 		unsigned long init_val);
 
+static inline bool arch_pkeys_enabled(void)
+{
+	return boot_cpu_has(X86_FEATURE_OSPKE);
+}
+
 /*
  * Try to dedicate one of the protection keys to be used as an
  * execute-only protection key.
-- 
2.14.1