nds32: function_graph: Simplify with function_graph_enter()

The function_graph_enter() function does the work of calling the function
graph hook function and the management of the shadow stack, simplifying the
work done in the architecture dependent prepare_ftrace_return().

Have nds32 use the new code, and remove the shadow stack management as well as
having to set up the trace structure.

This is needed to prepare for a fix of a design bug on how the curr_ret_stack
is used.

Cc: Greentime Hu <greentime@andestech.com>
Cc: stable@kernel.org
Fixes: 03274a3f ("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Reviewed-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 8712b27c
...@@ -211,29 +211,15 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, ...@@ -211,29 +211,15 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
unsigned long frame_pointer) unsigned long frame_pointer)
{ {
unsigned long return_hooker = (unsigned long)&return_to_handler; unsigned long return_hooker = (unsigned long)&return_to_handler;
struct ftrace_graph_ent trace;
unsigned long old; unsigned long old;
int err;
if (unlikely(atomic_read(&current->tracing_graph_pause))) if (unlikely(atomic_read(&current->tracing_graph_pause)))
return; return;
old = *parent; old = *parent;
trace.func = self_addr; if (!function_graph_enter(old, self_addr, frame_pointer, NULL))
trace.depth = current->curr_ret_stack + 1; *parent = return_hooker;
/* Only trace if the calling function expects to */
if (!ftrace_graph_entry(&trace))
return;
err = ftrace_push_return_trace(old, self_addr, &trace.depth,
frame_pointer, NULL);
if (err == -EBUSY)
return;
*parent = return_hooker;
} }
noinline void ftrace_graph_caller(void) noinline void ftrace_graph_caller(void)
......
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