@@ -103,6 +103,15 @@ void noinstr __context_tracking_enter(enum ctx_state state)
}
EXPORT_SYMBOL_GPL(__context_tracking_enter);
+/*
+ * OBSOLETE:
+ * This function should be noinstr but the below local_irq_restore() is
+ * unsafe because it involves illegal RCU uses through tracing and lockdep.
+ * This is unlikely to be fixed as this function is obsolete. The preferred
+ * way is to call __context_tracking_enter() through user_enter_irqoff()
+ * or context_tracking_guest_enter(). It should be the arch entry code
+ * responsibility to call into context tracking with IRQs disabled.
+ */
void context_tracking_enter(enum ctx_state state)
{
unsigned long flags;
@@ -125,6 +134,14 @@ void context_tracking_enter(enum ctx_state state)
NOKPROBE_SYMBOL(context_tracking_enter);
EXPORT_SYMBOL_GPL(context_tracking_enter);
+/*
+ * OBSOLETE:
+ * This function should be noinstr but it unsafely calls local_irq_restore(),
+ * involving illegal RCU uses through tracing and lockdep.
+ * This is unlikely to be fixed as this function is obsolete. The preferred
+ * way is to call user_enter_irqoff(). It should be the arch entry code
+ * responsibility to call into context tracking with IRQs disabled.
+ */
void context_tracking_user_enter(void)
{
user_enter();
@@ -168,6 +185,15 @@ void noinstr __context_tracking_exit(enum ctx_state state)
}
EXPORT_SYMBOL_GPL(__context_tracking_exit);
+/*
+ * OBSOLETE:
+ * This function should be noinstr but the below local_irq_save() is
+ * unsafe because it involves illegal RCU uses through tracing and lockdep.
+ * This is unlikely to be fixed as this function is obsolete. The preferred
+ * way is to call __context_tracking_exit() through user_exit_irqoff()
+ * or context_tracking_guest_exit(). It should be the arch entry code
+ * responsibility to call into context tracking with IRQs disabled.
+ */
void context_tracking_exit(enum ctx_state state)
{
unsigned long flags;
@@ -182,6 +208,14 @@ void context_tracking_exit(enum ctx_state state)
NOKPROBE_SYMBOL(context_tracking_exit);
EXPORT_SYMBOL_GPL(context_tracking_exit);
+/*
+ * OBSOLETE:
+ * This function should be noinstr but it unsafely calls local_irq_save(),
+ * involving illegal RCU uses through tracing and lockdep. This is unlikely
+ * to be fixed as this function is obsolete. The preferred way is to call
+ * user_exit_irqoff(). It should be the arch entry code responsibility to
+ * call into context tracking with IRQs disabled.
+ */
void context_tracking_user_exit(void)
{
user_exit();