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[PATCH 2/4] context_tracking: Switch to new static_branch API

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  [PATCH 2/4] context_tracking: Switch to new static_branch API Andy Lutomirski <luto@kernel.org> - 2015-11-07 00:20 +0100
    Re: [PATCH 2/4] context_tracking: Switch to new static_branch API Thomas Gleixner <tglx@linutronix.de> - 2015-11-07 11:10 +0100

#1264643 — [PATCH 2/4] context_tracking: Switch to new static_branch API

This is much less error-prone than the old code.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
 include/linux/context_tracking_state.h | 4 ++--
 kernel/context_tracking.c              | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/context_tracking_state.h b/include/linux/context_tracking_state.h
index ee956c528fab..1d34fe68f48a 100644
--- a/include/linux/context_tracking_state.h
+++ b/include/linux/context_tracking_state.h
@@ -22,12 +22,12 @@ struct context_tracking {
 };
 
 #ifdef CONFIG_CONTEXT_TRACKING
-extern struct static_key context_tracking_enabled;
+extern struct static_key_false context_tracking_enabled;
 DECLARE_PER_CPU(struct context_tracking, context_tracking);
 
 static inline bool context_tracking_is_enabled(void)
 {
-	return static_key_false(&context_tracking_enabled);
+	return static_branch_unlikely(&context_tracking_enabled);
 }
 
 static inline bool context_tracking_cpu_is_enabled(void)
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 0a495ab35bc7..d0fb09e40784 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -24,7 +24,7 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/context_tracking.h>
 
-struct static_key context_tracking_enabled = STATIC_KEY_INIT_FALSE;
+DEFINE_STATIC_KEY_FALSE(context_tracking_enabled);
 EXPORT_SYMBOL_GPL(context_tracking_enabled);
 
 DEFINE_PER_CPU(struct context_tracking, context_tracking);
@@ -191,7 +191,7 @@ void __init context_tracking_cpu_set(int cpu)
 
 	if (!per_cpu(context_tracking.active, cpu)) {
 		per_cpu(context_tracking.active, cpu) = true;
-		static_key_slow_inc(&context_tracking_enabled);
+		static_branch_inc(&context_tracking_enabled);
 	}
 
 	if (initialized)
-- 
2.4.3

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#1264795

On Fri, 6 Nov 2015, Andy Lutomirski wrote:

> This is much less error-prone than the old code.
> 
> Signed-off-by: Andy Lutomirski <luto@kernel.org>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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