Merge tag 'v2.6.37' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / include / linux / jump_label.h

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
new file mode 100644 (file)
index 0000000..7880f18
--- /dev/null
+++ b/include/linux/jump_label.h
@@ -0,0 +1,79 @@
+#ifndef _LINUX_JUMP_LABEL_H
+#define _LINUX_JUMP_LABEL_H
+
+#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
+# include <asm/jump_label.h>
+# define HAVE_JUMP_LABEL
+#endif
+
+enum jump_label_type {
+       JUMP_LABEL_ENABLE,
+       JUMP_LABEL_DISABLE
+};
+
+struct module;
+
+#ifdef HAVE_JUMP_LABEL
+
+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 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);
+
+#define jump_label_enable(key) \
+       jump_label_update((unsigned long)key, JUMP_LABEL_ENABLE);
+
+#define jump_label_disable(key) \
+       jump_label_update((unsigned long)key, JUMP_LABEL_DISABLE);
+
+#else
+
+#define JUMP_LABEL(key, label)                 \
+do {                                           \
+       if (unlikely(*key))                     \
+               goto label;                     \
+} while (0)
+
+#define jump_label_enable(cond_var)    \
+do {                                   \
+       *(cond_var) = 1;                        \
+} while (0)
+
+#define jump_label_disable(cond_var)   \
+do {                                   \
+       *(cond_var) = 0;                        \
+} while (0)
+
+static inline int jump_label_apply_nops(struct module *mod)
+{
+       return 0;
+}
+
+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) {}
+
+#endif
+
+#define COND_STMT(key, stmt)                                   \
+do {                                                           \
+       __label__ jl_enabled;                                   \
+       JUMP_LABEL(key, jl_enabled);                            \
+       if (0) {                                                \
+jl_enabled:                                                    \
+               stmt;                                           \
+       }                                                       \
+} while (0)
+
+#endif