[PATCH v2 1/4] context_tracking: Switch to new static_branch API

From: Andy Lutomirski
Date: Wed Nov 11 2015 - 18:14:27 EST


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

Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
---
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)
--
2.5.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/