ftrace: Add sample module that uses register_ftrace_direct()

Add a sample module that shows a simple use case for
regsiter_ftrace_direct(), and how to use it.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/samples/Kconfig b/samples/Kconfig
index c8dacb4dda80..65b5967dac0c 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -19,6 +19,14 @@ config SAMPLE_TRACE_PRINTK
 	 This builds a module that calls trace_printk() and can be used to
 	 test various trace_printk() calls from a module.
 
+config SAMPLE_FTRACE_DIRECT
+	tristate "Build register_ftrace_direct() example"
+	depends on DYNAMIC_FTRACE_WITH_DIRECT_CALLS && m
+	depends on X86_64 # has x86_64 inlined asm
+	help
+	  This builds an ftrace direct function example
+	  that hooks to wake_up_process and prints the parameters.
+
 config SAMPLE_KOBJECT
 	tristate "Build kobject examples"
 	help