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Subject[PATCH 40/43] x86/mm/kaiser: Add a function to check for KAISER being enabled
Date
From: Dave Hansen <dave.hansen@linux.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@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: linux-mm@kvack.org
Cc: luto@kernel.org
Cc: michael.schwarz@iaik.tugraz.at
Cc: moritz.lipp@iaik.tugraz.at
Cc: richard.fellner@student.tugraz.at
Link: https://lkml.kernel.org/r/20171123003518.B7D81B14@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/kaiser.h | 5 +++++
include/linux/kaiser.h | 5 +++++
2 files changed, 10 insertions(+)

diff --git a/arch/x86/include/asm/kaiser.h b/arch/x86/include/asm/kaiser.h
index 040cb096d29d..35f12a8a7071 100644
--- a/arch/x86/include/asm/kaiser.h
+++ b/arch/x86/include/asm/kaiser.h
@@ -56,6 +56,11 @@ extern void kaiser_remove_mapping(unsigned long start, unsigned long size);
*/
extern void kaiser_init(void);

+static inline bool kaiser_active(void)
+{
+ extern int kaiser_enabled;
+ return kaiser_enabled;
+}
#endif

#endif /* __ASSEMBLY__ */
diff --git a/include/linux/kaiser.h b/include/linux/kaiser.h
index 77db4230a0dd..a3d28d00d555 100644
--- a/include/linux/kaiser.h
+++ b/include/linux/kaiser.h
@@ -28,5 +28,10 @@ static inline int kaiser_add_mapping(unsigned long addr, unsigned long size,
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 */
--
2.14.1
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