linux-kernel - [PATCH] ftrace/fgraph: fix increased missing-prototypes warnings

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Message-Id: <20220506032737.23375-1-zhouchengming@bytedance.com>
Date:   Fri,  6 May 2022 11:27:37 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     rostedt@...dmis.org, mark.rutland@....com, catalin.marinas@....com
Cc:     linux-kernel@...r.kernel.org, kbuild-all@...ts.01.org,
        lkp@...el.com, zhouchengming@...edance.com
Subject: [PATCH] ftrace/fgraph: fix increased missing-prototypes warnings

After commit e999995c84c3 ("ftrace: cleanup ftrace_graph_caller enable
and disable") merged into the linux-next tree, the kernel test robot
(lkp@...el.com) has send out report that there are increased missing-prototypes
warnings caused by that commit.

COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 \
	O=build_dir ARCH=sh SHELL=/bin/bash kernel/trace/
warning: no previous prototype for 'ftrace_enable_ftrace_graph_caller' [-Wmissing-prototypes]
warning: no previous prototype for 'ftrace_disable_ftrace_graph_caller' [-Wmissing-prototypes]
warning: no previous prototype for 'ftrace_return_to_handler' [-Wmissing-prototypes]
warning: no previous prototype for 'ftrace_graph_sleep_time_control' [-Wmissing-prototypes]

BTW there are so many missing-prototypes warnings if build kernel with "W=1".

The increased warnings for 'ftrace_[enable,disable]_ftrace_graph_caller'
is caused by CONFIG_FUNCTION_GRAPH_TRACER && !CONFIG_DYNAMIC_FTRACE,
so the declarations in <linux/ftrace.h> can't be seen in fgraph.c.

And this warning can't reproduce on x86_64 since x86_64 select
HAVE_FUNCTION_GRAPH_TRACER only when DYNAMIC_FTRACE, so fgraph.c will
always see the declarations in <linux/ftrace.h>.

This patch fix the increased warnings by put the definitions in
CONFIG_DYNAMIC_FTRACE although there are no real problems exist.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 kernel/trace/fgraph.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 289311680c29..2cd374294be7 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -30,6 +30,7 @@ int ftrace_graph_active;
 /* Both enabled by default (can be cleared by function_graph tracer flags */
 static bool fgraph_sleep_time = true;

+#ifdef CONFIG_DYNAMIC_FTRACE
 /*
  * archs can override this function if they must do something
  * to enable hook for graph tracer.
@@ -47,6 +48,7 @@ int __weak ftrace_disable_ftrace_graph_caller(void)
 {
 	return 0;
 }
+#endif

 /**
  * ftrace_graph_stop - set to permanently disable function graph tracing
-- 
2.36.0