context_tracking: remove duplicate enabled check

All calls to context_tracking_enter and context_tracking_exit
are already checking context_tracking_is_enabled, except the
context_tracking_user_enter and context_tracking_user_exit
functions left in for the benefit of assembly calls.

Pull the check up to those functions, by making them simple
wrappers around the user_enter and user_exit inline functions.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Tested-by: Rik van Riel <riel@redhat.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 008fc67..6ef136f 100644 (file)
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -18,13 +18,13 @@ extern void context_tracking_user_exit(void);
 static inline void user_enter(void)
 {
        if (context_tracking_is_enabled())
-               context_tracking_user_enter();
+               context_tracking_enter(CONTEXT_USER);
 
 }
 static inline void user_exit(void)
 {
        if (context_tracking_is_enabled())
-               context_tracking_user_exit();
+               context_tracking_exit(CONTEXT_USER);
 }
 
 static inline enum ctx_state exception_enter(void)

diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 0a495ab..6d4c6ce 100644 (file)
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -62,15 +62,6 @@ void context_tracking_enter(enum ctx_state state)
 {
        unsigned long flags;
 
-       /*
-        * Repeat the user_enter() check here because some archs may be calling
-        * this from asm and if no CPU needs context tracking, they shouldn't
-        * go further. Repeat the check here until they support the inline static
-        * key check.
-        */
-       if (!context_tracking_is_enabled())
-               return;
-
        /*
         * Some contexts may involve an exception occuring in an irq,
         * leading to that nesting:
@@ -128,7 +119,7 @@ EXPORT_SYMBOL_GPL(context_tracking_enter);
 
 void context_tracking_user_enter(void)
 {
-       context_tracking_enter(CONTEXT_USER);
+       user_enter();
 }
 NOKPROBE_SYMBOL(context_tracking_user_enter);
 
@@ -148,9 +139,6 @@ void context_tracking_exit(enum ctx_state state)
 {
        unsigned long flags;
 
-       if (!context_tracking_is_enabled())
-               return;
-
        if (in_interrupt())
                return;
 
@@ -181,7 +169,7 @@ EXPORT_SYMBOL_GPL(context_tracking_exit);
 
 void context_tracking_user_exit(void)
 {
-       context_tracking_exit(CONTEXT_USER);
+       user_exit();
 }
 NOKPROBE_SYMBOL(context_tracking_user_exit);