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| author |   Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-07-15 11:05:12 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-07-15 11:10:25 -0400 |
| commit | 5f8bf2d263a20b986225ae1ed7d6759dc4b93af9 (patch) | |
| tree | d5ece8db33d03be215cf845155751b3f2fc0c155 /kernel | |
| parent | tracing: Add ftrace_trace_stack into __trace_puts/__trace_bputs (diff) | |
| download | linux-dev-5f8bf2d263a20b986225ae1ed7d6759dc4b93af9.tar.xz linux-dev-5f8bf2d263a20b986225ae1ed7d6759dc4b93af9.zip | |
tracing: Fix graph tracer with stack tracer on other archs
Running my ftrace tests on PowerPC, it failed the test that checks
if function_graph tracer is affected by the stack tracer. It was.
Looking into this, I found that the update_function_graph_func()
must be called even if the trampoline function is not changed.
This is because archs like PowerPC do not support ftrace_ops being
passed by assembly and instead uses a helper function (what the
trampoline function points to). Since this function is not changed
even when multiple ftrace_ops are added to the code, the test that
falls out before calling update_function_graph_func() will miss that
the update must still be done.
Call update_function_graph_function() for all calls to
update_ftrace_function()
Cc: stable@vger.kernel.org # 3.3+
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/ftrace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 5b372e3ed675..ac9d1dad630b 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -265,12 +265,12 @@ static void update_ftrace_function(void) func = ftrace_ops_list_func; } + update_function_graph_func(); + /* If there's no change, then do nothing more here */ if (ftrace_trace_function == func) return; - update_function_graph_func(); - /* * If we are using the list function, it doesn't care * about the function_trace_ops. |