ftrace: Fix -Wmissing-prototypes errors

Fix the following -Wmissing-prototypes errors:

kernel/trace/ftrace.c:297:5: error: no previous prototype for function '__register_ftrace_function' [-Werror,-Wmissing-prototypes]
   int __register_ftrace_function(struct ftrace_ops *ops)
       ^
   kernel/trace/ftrace.c:297:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __register_ftrace_function(struct ftrace_ops *ops)
   ^
   static
   kernel/trace/ftrace.c:340:5: error: no previous prototype for function '__unregister_ftrace_function' [-Werror,-Wmissing-prototypes]
   int __unregister_ftrace_function(struct ftrace_ops *ops)
       ^
   kernel/trace/ftrace.c:340:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __unregister_ftrace_function(struct ftrace_ops *ops)
   ^
   static
   kernel/trace/ftrace.c:579:5: error: no previous prototype for function 'ftrace_profile_pages_init' [-Werror,-Wmissing-prototypes]
   int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
       ^
   kernel/trace/ftrace.c:579:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
   ^
   static
   kernel/trace/ftrace.c:3871:15: error: no previous prototype for function 'arch_ftrace_match_adjust' [-Werror,-Wmissing-prototypes]
   char * __weak arch_ftrace_match_adjust(char *str, const char *search)
                 ^
   kernel/trace/ftrace.c:3871:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   char * __weak arch_ftrace_match_adjust(char *str, const char *search)
   ^
   static
   kernel/trace/ftrace.c:7029:6: error: no previous prototype for function 'arch_ftrace_ops_list_func' [-Werror,-Wmissing-prototypes]
   void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
        ^
   kernel/trace/ftrace.c:7029:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
   ^
   static
   5 errors generated.

Fixed by Steven and temporarily added to my -next tree.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

2 files changed, 11 insertions, 3 deletions

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index b86f52683b6f6..8771c435f34bb 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -178,7 +178,8 @@
 			ftrace_ops_list_func = arch_ftrace_ops_list_func;
 #else
 # ifdef CONFIG_FUNCTION_TRACER
-#  define MCOUNT_REC()	ftrace_stub_graph = ftrace_stub;
+#  define MCOUNT_REC()	ftrace_stub_graph = ftrace_stub;	\
+			ftrace_ops_list_func = arch_ftrace_ops_list_func;
 # else
 #  define MCOUNT_REC()
 # endif
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 832e65f067542..871b51bec1701 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -30,16 +30,25 @@
 #define ARCH_SUPPORTS_FTRACE_OPS 0
 #endif
 
+#ifdef CONFIG_FUNCTION_TRACER
+struct ftrace_ops;
 /*
  * If the arch's mcount caller does not support all of ftrace's
  * features, then it must call an indirect function that
  * does. Or at least does enough to prevent any unwelcome side effects.
+ *
+ * Also define the function prototype that these architectures use
+ * to call the ftrace_ops_list_func().
  */
 #if !ARCH_SUPPORTS_FTRACE_OPS
 # define FTRACE_FORCE_LIST_FUNC 1
+void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip);
 #else
 # define FTRACE_FORCE_LIST_FUNC 0
+void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
+			       struct ftrace_ops *op, struct ftrace_regs *fregs);
 #endif
+#endif /* CONFIG_FUNCTION_TRACER */
 
 /* Main tracing buffer and events set up */
 #ifdef CONFIG_TRACING
@@ -88,8 +97,6 @@ extern int
 ftrace_enable_sysctl(struct ctl_table *table, int write,
 		     void *buffer, size_t *lenp, loff_t *ppos);
 
-struct ftrace_ops;
-
 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
 
 struct ftrace_regs {