[PATCH 1/3] context_tracking: remove duplicate enabled check

[Paolo Bonzini]

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: Andy Lutomirski <l...@kernel.org>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Rik van Riel <r...@redhat.com>
Cc: Paul McKenney <paul...@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 include/linux/context_tracking.h |  4 ++--
 kernel/context_tracking.c        | 16 ++--------------
 2 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 008fc67d0d96..6ef136ff0897 100644
--- 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 0a495ab35bc7..6d4c6ce21275 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -63,15 +63,6 @@ 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:
         * rcu_irq_enter() rcu_user_exit() rcu_user_exit() rcu_irq_exit()
@@ -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);
 
-- 
2.5.0


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