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Subject[PATCH 2/6] mm, x86 : introduce arch_pkeys_enabled()
Date
Arch neutral code needs to know if the architecture supports
protection keys to display protection key in smaps. Hence
introducing arch_pkeys_enabled().

This patch also provides x86 implementation for
arch_pkeys_enabled().

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
arch/x86/include/asm/pkeys.h | 1 +
arch/x86/kernel/fpu/xstate.c | 5 +++++
include/linux/pkeys.h | 5 +++++
3 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/pkeys.h b/arch/x86/include/asm/pkeys.h
index b3b09b9..fa82799 100644
--- a/arch/x86/include/asm/pkeys.h
+++ b/arch/x86/include/asm/pkeys.h
@@ -5,6 +5,7 @@

extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
unsigned long init_val);
+extern bool arch_pkeys_enabled(void);

/*
* Try to dedicate one of the protection keys to be used as an
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index c24ac1e..df594b8 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -918,6 +918,11 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,

return 0;
}
+
+bool arch_pkeys_enabled(void)
+{
+ return boot_cpu_has(X86_FEATURE_OSPKE);
+}
#endif /* ! CONFIG_ARCH_HAS_PKEYS */

/*
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
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