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Date: Wed, 22 Nov 2017 16:35:18 -0800 From: Dave Hansen <dave.hansen@...ux.intel.com> To: linux-kernel@...r.kernel.org Cc: linux-mm@...ck.org, dave.hansen@...ux.intel.com, moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at, michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at, luto@...nel.org, torvalds@...ux-foundation.org, keescook@...gle.com, hughd@...gle.com, x86@...nel.org Subject: [PATCH 20/23] x86, kaiser: add a function to check for KAISER being enabled From: Dave Hansen <dave.hansen@...ux.intel.com> Currently, all of the checks for KAISER are compile-time checks. Runtime checks are needed for turning it on/off at runtime. Add a function to do that. Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com> Cc: Moritz Lipp <moritz.lipp@...k.tugraz.at> Cc: Daniel Gruss <daniel.gruss@...k.tugraz.at> Cc: Michael Schwarz <michael.schwarz@...k.tugraz.at> Cc: Richard Fellner <richard.fellner@...dent.tugraz.at> Cc: Andy Lutomirski <luto@...nel.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Kees Cook <keescook@...gle.com> Cc: Hugh Dickins <hughd@...gle.com> Cc: x86@...nel.org --- b/arch/x86/include/asm/kaiser.h | 5 +++++ b/include/linux/kaiser.h | 5 +++++ 2 files changed, 10 insertions(+) diff -puN arch/x86/include/asm/kaiser.h~kaiser-dynamic-check-func arch/x86/include/asm/kaiser.h --- a/arch/x86/include/asm/kaiser.h~kaiser-dynamic-check-func 2017-11-22 15:45:55.262619723 -0800 +++ b/arch/x86/include/asm/kaiser.h 2017-11-22 15:45:55.267619723 -0800 @@ -56,6 +56,11 @@ extern void kaiser_remove_mapping(unsign */ extern void kaiser_init(void); +static inline bool kaiser_active(void) +{ + extern int kaiser_enabled; + return kaiser_enabled; +} #endif #endif /* __ASSEMBLY__ */ diff -puN include/linux/kaiser.h~kaiser-dynamic-check-func include/linux/kaiser.h --- a/include/linux/kaiser.h~kaiser-dynamic-check-func 2017-11-22 15:45:55.264619723 -0800 +++ b/include/linux/kaiser.h 2017-11-22 15:45:55.268619723 -0800 @@ -28,5 +28,10 @@ static inline int kaiser_add_mapping(uns static inline void kaiser_add_mapping_cpu_entry(int cpu) { } + +static inline bool kaiser_active(void) +{ + return 0; +} #endif /* !CONFIG_KAISER */ #endif /* _INCLUDE_KAISER_H */ _
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