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static keys: Inline the static_key_enabled() function 

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@redhat.com>
Cc: a.p.zijlstra@chello.nl
Cc: rostedt@goodmis.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/201202281849.q1SIn1p2023270@int-mx10.intmail.prod.int.phx2.redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jason Baron 2012-02-28 13:49:01 -05:00 committed by Ingo Molnar
parent a706d4fc9e
commit 8eedce9965
2 changed files with 5 additions and 12 deletions
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11
include/linux/jump_label.h
View File

@ -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 */

6
kernel/jump_label.c
View File

@ -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;