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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2014-06-25 10:39:46 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-07-17 09:45:07 -0400
commit1b2f121c1418249e56048d816754b479b3cb6fb3 (patch)
tree67dd1900a39a5c688492d7f4989f41161943b1e7 /include/linux/ftrace.h
parent2b014666a1b93ad21c5667a4643da67bd49a5562 (diff)
ftrace-graph: Remove dependency of ftrace_stop() from ftrace_graph_stop()
ftrace_stop() is going away as it disables parts of function tracing that affects users that should not be affected. But ftrace_graph_stop() is built on ftrace_stop(). Here's another example of killing all of function tracing because something went wrong with function graph tracing. Instead of disabling all users of function tracing on function graph error, disable only function graph tracing. A new function is created called ftrace_graph_is_dead(). This is called in strategic paths to prevent function graph from doing more harm and allowing at least a warning to be printed before the system crashes. NOTE: ftrace_stop() is still used until all the archs are converted over to use ftrace_graph_is_dead(). After that, ftrace_stop() will be removed. Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
-rw-r--r--include/linux/ftrace.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 4807a39e7ae1..18fb2c4a3f7f 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -760,6 +760,7 @@ extern char __irqentry_text_end[];
extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
trace_func_graph_ent_t entryfunc);
+extern bool ftrace_graph_is_dead(void);
extern void ftrace_graph_stop(void);
/* The current handlers in use */