linux-kernel - [PATCH] ftrace: fix building with SYSCTL=y but DYNAMIC

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Date:   Thu, 21 Apr 2022 11:57:01 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     mingo@...hat.com, YueHaibing <yuehaibing@...wei.com>,
        patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
        mcgrof@...nel.org
Subject: [PATCH] ftrace: fix building with SYSCTL=y but DYNAMIC_FTRACE=n

Ok so hopefully this is the last of it. 0day picked up a build
failure [0] when SYSCTL=y but DYNAMIC_FTRACE=n. This can be fixed
by just declaring an empty routine for the calls moved just
recently.

[0] https://lkml.kernel.org/r/202204161203.6dSlgKJX-lkp@intel.com

Reported-by: kernel test robot <lkp@...el.com>
Fixes: f8b7d2b4c192 ("ftrace: fix building with SYSCTL=n but DYNAMIC_FTRACE=y")
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 kernel/trace/ftrace.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index d9424fd9a183..1f89039f0feb 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -7873,6 +7873,8 @@ int unregister_ftrace_function(struct ftrace_ops *ops)
 EXPORT_SYMBOL_GPL(unregister_ftrace_function);
 
 #ifdef CONFIG_SYSCTL
+
+#ifdef CONFIG_DYNAMIC_FTRACE
 static void ftrace_startup_sysctl(void)
 {
 	int command;
@@ -7906,6 +7908,10 @@ static void ftrace_shutdown_sysctl(void)
 		ftrace_run_update_code(command);
 	}
 }
+#else
+# define ftrace_startup_sysctl()       do { } while (0)
+# define ftrace_shutdown_sysctl()      do { } while (0)
+#endif /* CONFIG_DYNAMIC_FTRACE */
 
 static bool is_permanent_ops_registered(void)
 {
-- 
2.35.1