linux-kernel - [for-next][PATCH 14/18] function_graph: Make ftrace_push_return

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Date:   Wed, 21 Nov 2018 19:28:15 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-arch@...r.kernel.org,
        Joel Fernandes <joel@...lfernandes.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>, stable@...nel.org
Subject: [for-next][PATCH 14/18] function_graph: Make ftrace_push_return_trace() static

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

As all architectures now call function_graph_enter() to do the entry work,
no architecture should ever call ftrace_push_return_trace(). Make it static.

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

Cc: stable@...nel.org
Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 include/linux/ftrace.h               | 3 ---
 kernel/trace/trace_functions_graph.c | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 5717e8f81c59..dd16e8218db3 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -776,9 +776,6 @@ struct ftrace_ret_stack {
  */
 extern void return_to_handler(void);
 
-extern int
-ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
-			 unsigned long frame_pointer, unsigned long *retp);
 extern int
 function_graph_enter(unsigned long ret, unsigned long func,
 		     unsigned long frame_pointer, unsigned long *retp);
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 28f2602435d0..88ca787a1cdc 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -118,7 +118,7 @@ print_graph_duration(struct trace_array *tr, unsigned long long duration,
 		     struct trace_seq *s, u32 flags);
 
 /* Add a function return address to the trace stack on thread info.*/
-int
+static int
 ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
 			 unsigned long frame_pointer, unsigned long *retp)
 {
-- 
2.19.1