linux-kernel - [PATCH] jump label: Change static_key_enabled() function -> 'static inline'

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Date:	Tue, 28 Feb 2012 13:49:01 -0500
From:	Jason Baron <jbaron@...hat.com>
To:	mingo@...e.hu
Cc:	a.p.zijlstra@...llo.nl, rostedt@...dmis.org,
	mathieu.desnoyers@...ymtl.ca, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] jump label: Change static_key_enabled() function -> 'static inline'

In the jump label enabled case, calling static_key_enabled() results in
a function call. The function returns the results of a compare, so it
really doesn't need the overhead of a full function call. Let's make
it 'static inline' for both the jump label enabled and disabled cases.

Signed-off-by: Jason Baron <jbaron@...hat.com>
---
 include/linux/jump_label.h |   11 +++++------
 kernel/jump_label.c        |    6 ------
 2 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 2172da2..c513a40 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -127,7 +127,6 @@ extern int jump_label_text_reserved(void *start, void *end);
 extern void static_key_slow_inc(struct static_key *key);
 extern void static_key_slow_dec(struct static_key *key);
 extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
-extern bool static_key_enabled(struct static_key *key);
 extern void jump_label_apply_nops(struct module *mod);
 extern void
 jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
@@ -198,11 +197,6 @@ static inline int jump_label_text_reserved(void *start, void *end)
 static inline void jump_label_lock(void) {}
 static inline void jump_label_unlock(void) {}
 
-static inline bool static_key_enabled(struct static_key *key)
-{
-	return (atomic_read(&key->enabled) > 0);
-}
-
 static inline int jump_label_apply_nops(struct module *mod)
 {
 	return 0;
@@ -224,4 +218,9 @@ jump_label_rate_limit(struct static_key_deferred *key,
 #define STATIC_KEY_INIT STATIC_KEY_INIT_FALSE
 #define jump_label_enabled static_key_enabled
 
+static inline bool static_key_enabled(struct static_key *key)
+{
+	return (atomic_read(&key->enabled) > 0);
+}
+
 #endif	/* _LINUX_JUMP_LABEL_H */
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index bf9dcad..4304919 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -29,12 +29,6 @@ void jump_label_unlock(void)
 	mutex_unlock(&jump_label_mutex);
 }
 
-bool static_key_enabled(struct static_key *key)
-{
-	return (atomic_read(&key->enabled) > 0);
-}
-EXPORT_SYMBOL_GPL(static_key_enabled);
-
 static int jump_label_cmp(const void *a, const void *b)
 {
 	const struct jump_entry *jea = a;
-- 
1.7.7.6

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