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

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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.

Cc: Ralf Baechle <ralf@linux-mips.org>
Tested-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-06-25 09:53:21 -04:00 committed by Steven Rostedt
parent e1dc5007cf
commit 6a8a505113
1 changed files with 3 additions and 0 deletions
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3
arch/mips/kernel/ftrace.c
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@ -302,6 +302,9 @@ void prepare_ftrace_return(unsigned long *parent_ra_addr, unsigned long self_ra,
&return_to_handler; &return_to_handler;
int faulted, insns; int faulted, insns;
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;