1 files changed, 102 insertions, 0 deletions

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
new file mode 100644
index 000000000000..83e745f3ead7
--- /dev/null
+++ b/include/linux/jump_label.h
@@ -0,0 +1,102 @@
+#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)
+
+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 {
+        JUMP_LABEL_DISABLE = 0,
+        JUMP_LABEL_ENABLE,
+};
+
+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 void jump_label_lock(void);
+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 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);
+
+#else
+
+#include <asm/atomic.h>
+
+#define JUMP_LABEL_INIT {ATOMIC_INIT(0)}
+
+struct jump_label_key {
+        atomic_t enabled;
+};
+
+static __always_inline bool static_branch(struct jump_label_key *key)
+{
+        if (unlikely(atomic_read(&key->enabled)))
+                return true;
+        return false;
+}
+
+static inline void jump_label_inc(struct jump_label_key *key)
+{
+        atomic_inc(&key->enabled);
+}
+
+static inline void jump_label_dec(struct jump_label_key *key)
+{
+        atomic_dec(&key->enabled);
+}
+
+static inline int jump_label_text_reserved(void *start, void *end)
+{
+        return 0;
+}
+
+static inline void jump_label_lock(void) {}
+static inline void jump_label_unlock(void) {}
+
+static inline bool jump_label_enabled(struct jump_label_key *key)
+{
+        return !!atomic_read(&key->enabled);
+}
+
+static inline int jump_label_apply_nops(struct module *mod)
+{
+        return 0;
+}
+
+#endif
+
+#endif