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-rw-r--r--include/linux/context_tracking.h11
-rw-r--r--kernel/context_tracking.c6
2 files changed, 12 insertions, 5 deletions
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 8854eadb2142..e070ea5dadac 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -40,6 +40,8 @@ extern void context_tracking_cpu_set(int cpu);
extern void context_tracking_user_enter(void);
extern void context_tracking_user_exit(void);
+extern void __context_tracking_task_switch(struct task_struct *prev,
+ struct task_struct *next);
static inline void user_enter(void)
{
@@ -74,8 +76,12 @@ static inline void exception_exit(enum ctx_state prev_ctx)
}
}
-extern void context_tracking_task_switch(struct task_struct *prev,
- struct task_struct *next);
+static inline void context_tracking_task_switch(struct task_struct *prev,
+ struct task_struct *next)
+{
+ if (static_key_false(&context_tracking_enabled))
+ __context_tracking_task_switch(prev, next);
+}
#else
static inline bool context_tracking_in_user(void) { return false; }
static inline void user_enter(void) { }
@@ -112,6 +118,7 @@ static inline void guest_exit(void)
else
current->flags &= ~PF_VCPU;
}
+
#else
static inline void guest_enter(void)
{
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index b6a186c4b886..c17822673c39 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -166,7 +166,7 @@ void context_tracking_user_exit(void)
}
/**
- * context_tracking_task_switch - context switch the syscall callbacks
+ * __context_tracking_task_switch - context switch the syscall callbacks
* @prev: the task that is being switched out
* @next: the task that is being switched in
*
@@ -178,8 +178,8 @@ void context_tracking_user_exit(void)
* migrate to some CPU that doesn't do the context tracking. As such the TIF
* flag may not be desired there.
*/
-void context_tracking_task_switch(struct task_struct *prev,
- struct task_struct *next)
+void __context_tracking_task_switch(struct task_struct *prev,
+ struct task_struct *next)
{
clear_tsk_thread_flag(prev, TIF_NOHZ);
set_tsk_thread_flag(next, TIF_NOHZ);