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Date: Fri, 15 Sep 2017 18:21:06 -0700 From: Ram Pai <linuxram@...ibm.com> To: mpe@...erman.id.au, 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 Cc: arnd@...db.de, akpm@...ux-foundation.org, corbet@....net, mingo@...hat.com, benh@...nel.crashing.org, paulus@...ba.org, khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com, hbabu@...ibm.com, mhocko@...nel.org, bauerman@...ux.vnet.ibm.com, ebiederm@...ssion.com, linuxram@...ibm.com Subject: [PATCH 2/6] mm, x86 : introduce arch_pkeys_enabled() 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@...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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