ftrace/samples: Add missing prototypes direct functions

commit 0daf5cb217a9ca8ae91b8f966ddae322699fb71d upstream.

There's another compilation fail (first here [1]) reported by kernel
test robot for W=1 clang build:

  >> samples/ftrace/ftrace-direct-multi-modify.c:7:6: warning: no previous
  prototype for function 'my_direct_func1' [-Wmissing-prototypes]
     void my_direct_func1(unsigned long ip)

Direct functions in ftrace direct sample modules need to have prototypes
defined. They are already global in order to be visible for the inline
assembly, so there's no problem.

The kernel test robot reported just error for ftrace-direct-multi-modify,
but I got same errors also for the rest of the modules touched by this patch.

[1] 67d4f6e3bf5d ftrace/samples: Add missing prototype for my_direct_func

Link: https://lkml.kernel.org/r/20211219135317.212430-1-jolsa@kernel.org
Reported-by: kernel test robot <lkp@intel.com>
Fixes: e1067a07cfbc ("ftrace/samples: Add module to test multi direct modify interface")
Fixes: ae0cc3b7e7f5 ("ftrace/samples: Add a sample module that implements modify_ftrace_direct()")
Fixes: 156473a0ff4f ("ftrace: Add another example of register_ftrace_direct() use case")
Fixes: b06457c83af6 ("ftrace: Add sample module that uses register_ftrace_direct()")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
index 5b9a09957c6e0e653590affbf1b214b7328262f5..89e6bf27cd9f6c5f7a95a534fca7bff5d7fb21d8 100644 (file)
--- a/samples/ftrace/ftrace-direct-modify.c
+++ b/samples/ftrace/ftrace-direct-modify.c
@@ -3,6 +3,9 @@
 #include <linux/kthread.h>
 #include <linux/ftrace.h>
 
+extern void my_direct_func1(void);
+extern void my_direct_func2(void);
+
 void my_direct_func1(void)
 {
        trace_printk("my direct func1\n");

diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c
index 3f0079c9bd6fa2bb99e303731d34911b4f8f035f..11b99325f3dbf910d3fce35bacb4684449ffdf83 100644 (file)
--- a/samples/ftrace/ftrace-direct-too.c
+++ b/samples/ftrace/ftrace-direct-too.c
@@ -4,6 +4,9 @@
 #include <linux/mm.h> /* for handle_mm_fault() */
 #include <linux/ftrace.h>
 
+extern void my_direct_func(struct vm_area_struct *vma,
+                          unsigned long address, unsigned int flags);
+
 void my_direct_func(struct vm_area_struct *vma,
                        unsigned long address, unsigned int flags)
 {

diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c
index a2729d1ef17f538e66aa2e443b286c0560dee99f..642c50b5f7166e0f8bef86987e0ac15f311cc98c 100644 (file)
--- a/samples/ftrace/ftrace-direct.c
+++ b/samples/ftrace/ftrace-direct.c
@@ -4,6 +4,8 @@
 #include <linux/sched.h> /* for wake_up_process() */
 #include <linux/ftrace.h>
 
+extern void my_direct_func(struct task_struct *p);
+
 void my_direct_func(struct task_struct *p)
 {
        trace_printk("waking up %s-%d\n", p->comm, p->pid);