kprobes: Update header for ftrace optimization
Update the header for use of using ftrace for a kprobe. If a probe is
added on top of a ftrace nop, use ftrace if possible.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 23cf41e..50ea9a7 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -38,6 +38,7 @@
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/mutex.h>
+#include <linux/ftrace.h>
#ifdef CONFIG_KPROBES
#include <asm/kprobes.h>
@@ -58,6 +59,15 @@
#define __kprobes
#endif /* CONFIG_KPROBES */
+/*
+ * If function tracer is enabled and the arch supports full
+ * passing of pt_regs to function tracing, then kprobes can
+ * optimize on top of function tracing.
+ */
+#if defined(CONFIG_FUNCTION_TRACER) && defined(ARCH_SUPPORTS_FTRACE_SAVE_REGS)
+# define KPROBES_CAN_USE_FTRACE
+#endif
+
struct kprobe;
struct pt_regs;
struct kretprobe;
@@ -113,6 +123,11 @@
/* copy of the original instruction */
struct arch_specific_insn ainsn;
+#ifdef KPROBES_CAN_USE_FTRACE
+ /* If it is possible to use ftrace to probe */
+ struct ftrace_ops fops;
+#endif
+
/*
* Indicates various status flags.
* Protected by kprobe_mutex after this kprobe is registered.
@@ -121,14 +136,15 @@
};
/* Kprobe status flags */
-#define KPROBE_FLAG_GONE 1 /* breakpoint has already gone */
-#define KPROBE_FLAG_DISABLED 2 /* probe is temporarily disabled */
-#define KPROBE_FLAG_OPTIMIZED 4 /*
- * probe is really optimized.
- * NOTE:
- * this flag is only for optimized_kprobe.
- */
-#define KPROBE_FLAG_MOVED 8 /* probe was moved passed ftrace nop */
+#define KPROBE_FLAG_GONE 1 /* breakpoint has already gone */
+#define KPROBE_FLAG_DISABLED 2 /* probe is temporarily disabled */
+#define KPROBE_FLAG_OPTIMIZED 4 /*
+ * probe is really optimized.
+ * NOTE:
+ * this flag is only for optimized_kprobe.
+ */
+#define KPROBE_FLAG_MOVED 8 /* probe was moved passed ftrace nop */
+#define KPROBE_FLAG_FTRACE 16 /* probe is using ftrace */
/* Has this kprobe gone ? */
static inline int kprobe_gone(struct kprobe *p)
