linux-kernel - [PATCH v3 1/3] ftrace: cleanup ftrace_graph

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Message-Id: <20220224093251.49971-1-zhouchengming@bytedance.com>
Date:   Thu, 24 Feb 2022 17:32:49 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     rostedt@...dmis.org, mark.rutland@....com, mingo@...hat.com,
        tglx@...utronix.de, catalin.marinas@....com, will@...nel.org,
        dave.hansen@...ux.intel.com, broonie@...nel.org
Cc:     x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, songmuchun@...edance.com,
        qirui.001@...edance.com,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH v3 1/3] ftrace: cleanup ftrace_graph_caller enable and disable

The ftrace_enable_ftrace_graph_caller() and
ftrace_disable_ftrace_graph_caller() are used to do special
hooks for graph tracer, which are not needed on some ARCHs
that use graph_ops:func function to install return_hooker.

So introduce the weak version in Ftrace core code to prepare
for cleanup.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 kernel/trace/ftrace.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f9feb197b2da..60ae009e6684 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2704,6 +2704,26 @@ int __weak ftrace_arch_code_modify_post_process(void)
 	return 0;
 }
 
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+/*
+ * archs can override this function if they must do something
+ * to enable hook for graph tracer.
+ */
+int __weak ftrace_enable_ftrace_graph_caller(void)
+{
+	return 0;
+}
+
+/*
+ * archs can override this function if they must do something
+ * to disable hook for graph tracer.
+ */
+int __weak ftrace_disable_ftrace_graph_caller(void)
+{
+	return 0;
+}
+#endif
+
 void ftrace_modify_all_code(int command)
 {
 	int update = command & FTRACE_UPDATE_TRACE_FUNC;
-- 
2.20.1