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jump label: Introduce static_branch() interface
[deliverable/linux.git]
/
include
/
linux
/
jump_label.h
diff --git
a/include/linux/jump_label.h
b/include/linux/jump_label.h
index 7880f18e4b863b7d0ad6a84a0b55a06452ad0990..83e745f3ead76b225d52a92608819c47d8a8c209 100644
(file)
--- a/
include/linux/jump_label.h
+++ b/
include/linux/jump_label.h
@@
-1,20
+1,43
@@
#ifndef _LINUX_JUMP_LABEL_H
#define _LINUX_JUMP_LABEL_H
#ifndef _LINUX_JUMP_LABEL_H
#define _LINUX_JUMP_LABEL_H
+#include <linux/types.h>
+#include <linux/compiler.h>
+
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
+
+struct jump_label_key {
+ atomic_t enabled;
+ struct jump_entry *entries;
+#ifdef CONFIG_MODULES
+ struct jump_label_mod *next;
+#endif
+};
+
# include <asm/jump_label.h>
# define HAVE_JUMP_LABEL
#endif
enum jump_label_type {
# include <asm/jump_label.h>
# define HAVE_JUMP_LABEL
#endif
enum jump_label_type {
+ JUMP_LABEL_DISABLE = 0,
JUMP_LABEL_ENABLE,
JUMP_LABEL_ENABLE,
- JUMP_LABEL_DISABLE
};
struct module;
#ifdef HAVE_JUMP_LABEL
};
struct module;
#ifdef HAVE_JUMP_LABEL
+#ifdef CONFIG_MODULES
+#define JUMP_LABEL_INIT {{ 0 }, NULL, NULL}
+#else
+#define JUMP_LABEL_INIT {{ 0 }, NULL}
+#endif
+
+static __always_inline bool static_branch(struct jump_label_key *key)
+{
+ return arch_static_branch(key);
+}
+
extern struct jump_entry __start___jump_table[];
extern struct jump_entry __stop___jump_table[];
extern struct jump_entry __start___jump_table[];
extern struct jump_entry __stop___jump_table[];
@@
-23,37
+46,37
@@
extern void jump_label_unlock(void);
extern void arch_jump_label_transform(struct jump_entry *entry,
enum jump_label_type type);
extern void arch_jump_label_text_poke_early(jump_label_t addr);
extern void arch_jump_label_transform(struct jump_entry *entry,
enum jump_label_type type);
extern void arch_jump_label_text_poke_early(jump_label_t addr);
-extern void jump_label_update(unsigned long key, enum jump_label_type type);
-extern void jump_label_apply_nops(struct module *mod);
extern int jump_label_text_reserved(void *start, void *end);
extern int jump_label_text_reserved(void *start, void *end);
+extern void jump_label_inc(struct jump_label_key *key);
+extern void jump_label_dec(struct jump_label_key *key);
+extern bool jump_label_enabled(struct jump_label_key *key);
+extern void jump_label_apply_nops(struct module *mod);
-#define jump_label_enable(key) \
- jump_label_update((unsigned long)key, JUMP_LABEL_ENABLE);
+#else
-#define jump_label_disable(key) \
- jump_label_update((unsigned long)key, JUMP_LABEL_DISABLE);
+#include <asm/atomic.h>
-#
else
+#
define JUMP_LABEL_INIT {ATOMIC_INIT(0)}
-#define JUMP_LABEL(key, label) \
-do { \
- if (unlikely(*key)) \
- goto label; \
-} while (0)
+struct jump_label_key {
+ atomic_t enabled;
+};
-#define jump_label_enable(cond_var) \
-do { \
- *(cond_var) = 1; \
-} while (0)
+static __always_inline bool static_branch(struct jump_label_key *key)
+{
+ if (unlikely(atomic_read(&key->enabled)))
+ return true;
+ return false;
+}
-#define jump_label_disable(cond_var) \
-do { \
- *(cond_var) = 0; \
-}
while (0)
+static inline void jump_label_inc(struct jump_label_key *key)
+{
+ atomic_inc(&key->enabled);
+}
-static inline
int jump_label_apply_nops(struct module *mod
)
+static inline
void jump_label_dec(struct jump_label_key *key
)
{
{
-
return 0
;
+
atomic_dec(&key->enabled)
;
}
static inline int jump_label_text_reserved(void *start, void *end)
}
static inline int jump_label_text_reserved(void *start, void *end)
@@
-64,16
+87,16
@@
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 void jump_label_lock(void) {}
static inline void jump_label_unlock(void) {}
-#endif
+static inline bool jump_label_enabled(struct jump_label_key *key)
+{
+ return !!atomic_read(&key->enabled);
+}
-#define COND_STMT(key, stmt) \
-do { \
- __label__ jl_enabled; \
- JUMP_LABEL(key, jl_enabled); \
- if (0) { \
-jl_enabled: \
- stmt; \
- } \
-} while (0)
+static inline int jump_label_apply_nops(struct module *mod)
+{
+ return 0;
+}
+
+#endif
#endif
#endif
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