Commit 3a46588e authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Steven Rostedt

parisc: ftrace: Add call to ftrace_graph_is_dead() in function graph code

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. To do this, the arch code
must call ftrace_graph_is_dead() before it implements function graph.

Link: http://lkml.kernel.org/r/53B08317.7010501@gmx.de

Cc: Kyle McMartin <kyle@mcmartin.ca>
Acked-by: default avatarHelge Deller <deller@gmx.de>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 6a8a5051
...@@ -112,6 +112,9 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) ...@@ -112,6 +112,9 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
unsigned long long calltime; unsigned long long calltime;
struct ftrace_graph_ent trace; struct ftrace_graph_ent trace;
if (unlikely(ftrace_graph_is_dead()))
return;
if (unlikely(atomic_read(&current->tracing_graph_pause))) if (unlikely(atomic_read(&current->tracing_graph_pause)))
return; return;
......
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