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authorIngo Molnar <mingo@elte.hu>2008-11-12 10:17:09 +0100
committerIngo Molnar <mingo@elte.hu>2008-11-12 10:17:09 +0100
commit60a011c736e7dd09a0b01ca6a051a416f3f52ffb (patch)
tree20e91db58c3bbfa622d3ed8ec747e4974a807284 /include/linux
parentd06bbd669539215405874d8fe32ab65105e6c4bb (diff)
parent19b3e9671c5a219b8c34da2cc66e0ce7c3a501ae (diff)
Merge branch 'tracing/function-return-tracer' into tracing/fastboot
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/ftrace.h20
-rw-r--r--include/linux/ftrace_irq.h2
-rw-r--r--include/linux/sched.h11
3 files changed, 32 insertions, 1 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 1f5608c1102..dcbbf72a88b 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -268,6 +268,26 @@ ftrace_init_module(unsigned long *start, unsigned long *end) { }
/*
+ * Structure that defines a return function trace.
+ */
+struct ftrace_retfunc {
+ unsigned long ret; /* Return address */
+ unsigned long func; /* Current function */
+ unsigned long long calltime;
+ unsigned long long rettime;
+};
+
+#ifdef CONFIG_FUNCTION_RET_TRACER
+/* Type of a callback handler of tracing return function */
+typedef void (*trace_function_return_t)(struct ftrace_retfunc *);
+
+extern void register_ftrace_return(trace_function_return_t func);
+/* The current handler in use */
+extern trace_function_return_t ftrace_function_return;
+extern void unregister_ftrace_return(void);
+#endif
+
+/*
* Structure which defines the trace of an initcall.
* You don't have to fill the func field since it is
* only used internally by the tracer.
diff --git a/include/linux/ftrace_irq.h b/include/linux/ftrace_irq.h
index b1299d6729f..0b4df55d7a7 100644
--- a/include/linux/ftrace_irq.h
+++ b/include/linux/ftrace_irq.h
@@ -2,7 +2,7 @@
#define _LINUX_FTRACE_IRQ_H
-#ifdef CONFIG_DYNAMIC_FTRACE
+#if defined(CONFIG_DYNAMIC_FTRACE) || defined(CONFIG_FUNCTION_RET_TRACER)
extern void ftrace_nmi_enter(void);
extern void ftrace_nmi_exit(void);
#else
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 644ffbda17c..61c8cc36028 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2006,6 +2006,17 @@ static inline void setup_thread_stack(struct task_struct *p, struct task_struct
{
*task_thread_info(p) = *task_thread_info(org);
task_thread_info(p)->task = p;
+
+#ifdef CONFIG_FUNCTION_RET_TRACER
+ /*
+ * When fork() creates a child process, this function is called.
+ * But the child task may not inherit the return adresses traced
+ * by the return function tracer because it will directly execute
+ * in userspace and will not return to kernel functions its parent
+ * used.
+ */
+ task_thread_info(p)->curr_ret_stack = -1;
+#endif
}
static inline unsigned long *end_of_stack(struct task_struct *p)