2 files changed, 29 insertions, 15 deletions

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index e24339ccb7f0..b28d161c1091 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -3,12 +3,40 @@
 
 #ifdef CONFIG_CONTEXT_TRACKING
 #include <linux/sched.h>
+#include <linux/percpu.h>
+
+struct context_tracking {
+        /*
+         * When active is false, probes are unset in order
+         * to minimize overhead: TIF flags are cleared
+         * and calls to user_enter/exit are ignored. This
+         * may be further optimized using static keys.
+         */
+        bool active;
+        enum {
+                IN_KERNEL = 0,
+                IN_USER,
+        } state;
+};
+
+DECLARE_PER_CPU(struct context_tracking, context_tracking);
+
+static inline bool context_tracking_in_user(void)
+{
+        return __this_cpu_read(context_tracking.state) == IN_USER;
+}
+
+static inline bool context_tracking_active(void)
+{
+        return __this_cpu_read(context_tracking.active);
+}
 
 extern void user_enter(void);
 extern void user_exit(void);
 extern void context_tracking_task_switch(struct task_struct *prev,
                                          struct task_struct *next);
 #else
+static inline bool context_tracking_in_user(void) { return false; }
 static inline void user_enter(void) { }
 static inline void user_exit(void) { }
 static inline void context_tracking_task_switch(struct task_struct *prev,
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index e0e07fd55508..54f471e536dc 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -1,24 +1,10 @@
 #include <linux/context_tracking.h>
 #include <linux/rcupdate.h>
 #include <linux/sched.h>
-#include <linux/percpu.h>
 #include <linux/hardirq.h>
 
-struct context_tracking {
-        /*
-         * When active is false, hooks are not set to
-         * minimize overhead: TIF flags are cleared
-         * and calls to user_enter/exit are ignored. This
-         * may be further optimized using static keys.
-         */
-        bool active;
-        enum {
-                IN_KERNEL = 0,
-                IN_USER,
-        } state;
-};
 
-static DEFINE_PER_CPU(struct context_tracking, context_tracking) = {
+DEFINE_PER_CPU(struct context_tracking, context_tracking) = {
 #ifdef CONFIG_CONTEXT_TRACKING_FORCE
         .active = true,
 #endif