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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2018-11-19 20:54:08 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-12-08 20:54:07 -0500
commitb0e21a61d3196762b61f43ae994ffd255f646774 (patch)
treec8d44c604668ecde57890429bc2b6f4fd81cc04f /kernel/trace/fgraph.c
parent76b42b63ed0d004961097d3a3cd979129d4afd26 (diff)
downloadlinux-b0e21a61d3196762b61f43ae994ffd255f646774.tar.bz2
function_graph: Have profiler use new helper ftrace_graph_get_ret_stack()
The ret_stack processing is going to change, and that is going to break anything that is accessing the ret_stack directly. One user is the function graph profiler. By using the ftrace_graph_get_ret_stack() helper function, the profiler can access the ret_stack entry without relying on the implementation details of the stack itself. Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/fgraph.c')
-rw-r--r--kernel/trace/fgraph.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 90fcefcaff2a..a3704ec8b599 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -232,6 +232,17 @@ unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
return ret;
}
+struct ftrace_ret_stack *
+ftrace_graph_get_ret_stack(struct task_struct *task, int idx)
+{
+ idx = current->curr_ret_stack - idx;
+
+ if (idx >= 0 && idx <= task->curr_ret_stack)
+ return &current->ret_stack[idx];
+
+ return NULL;
+}
+
/**
* ftrace_graph_ret_addr - convert a potentially modified stack return address
* to its original value