context_tracking: Rename context_tracking_user_enter/exit() to user_enter/exit_callable()

context_tracking_user_enter() and context_tracking_user_exit() are
ASM callable versions of user_enter() and user_exit() for architectures
that didn't manage to check the context tracking static key from ASM.
Change those function names to better reflect their purpose.

[ frederic: Apply Max Filippov feedback. ]

Signed-off-by: Frederic Weisbecker <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Neeraj Upadhyay <[email protected]>
Cc: Uladzislau Rezki <[email protected]>
Cc: Joel Fernandes <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Nicolas Saenz Julienne <[email protected]>
Cc: Marcelo Tosatti <[email protected]>
Cc: Xiongfeng Wang <[email protected]>
Cc: Yu Liao <[email protected]>
Cc: Phil Auld <[email protected]>
Cc: Paul Gortmaker<[email protected]>
Cc: Alex Belits <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Nicolas Saenz Julienne <[email protected]>
Tested-by: Nicolas Saenz Julienne <[email protected]>

1 files changed, 17 insertions, 11 deletions

diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 88c60ab39fbb..8f7dd5799bda 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -134,19 +134,22 @@ 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.
+/**
+ * user_enter_callable() - Unfortunate ASM callable version of user_enter() for
+ *			   archs that didn't manage to check the context tracking
+ *			   static key from low level code.
+ *
+ * This OBSOLETE 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  * This is unlikely to be fixed as this function is obsolete.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)
+void user_enter_callable(void)
 {
 	user_enter();
 }
-NOKPROBE_SYMBOL(context_tracking_user_enter);
+NOKPROBE_SYMBOL(user_enter_callable);
 
 /**
  * __ct_user_exit - Inform the context tracking that the CPU is
@@ -208,19 +211,22 @@ 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(),
+/**
+ * user_exit_callable() - Unfortunate ASM callable version of user_exit() for
+ *			  archs that didn't manage to check the context tracking
+ *			  static key from low level code.
+ *
+ * This OBSOLETE 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)
+void user_exit_callable(void)
 {
 	user_exit();
 }
-NOKPROBE_SYMBOL(context_tracking_user_exit);
+NOKPROBE_SYMBOL(user_exit_callable);
 
 void __init context_tracking_cpu_set(int cpu)
 {