ftrace: Make ftrace_modify_all_code() global for archs to use

Rename __ftrace_modify_code() to ftrace_modify_all_code() and make
it global for all archs to use. This will remove the duplication
of code, as archs that can modify code without stop_machine()
can use it directly outside of the stop_machine() call.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

include/linux/ftrace.h

@@ -319,6 +319,8 @@ extern void ftrace_caller(void);
 extern void ftrace_call(void);
 extern void mcount_call(void);
 
+void ftrace_modify_all_code(int command);
+
 #ifndef FTRACE_ADDR
 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
 #endif

kernel/trace/ftrace.c

@@ -1811,22 +1811,27 @@ int __weak ftrace_arch_code_modify_post_process(void)
 	return 0;
 }
 
-static int __ftrace_modify_code(void *data)
+void ftrace_modify_all_code(int command)
 {
-	int *command = data;
-
-	if (*command & FTRACE_UPDATE_CALLS)
+	if (command & FTRACE_UPDATE_CALLS)
 		ftrace_replace_code(1);
-	else if (*command & FTRACE_DISABLE_CALLS)
+	else if (command & FTRACE_DISABLE_CALLS)
 		ftrace_replace_code(0);
 
-	if (*command & FTRACE_UPDATE_TRACE_FUNC)
+	if (command & FTRACE_UPDATE_TRACE_FUNC)
 		ftrace_update_ftrace_func(ftrace_trace_function);
 
-	if (*command & FTRACE_START_FUNC_RET)
+	if (command & FTRACE_START_FUNC_RET)
 		ftrace_enable_ftrace_graph_caller();
-	else if (*command & FTRACE_STOP_FUNC_RET)
+	else if (command & FTRACE_STOP_FUNC_RET)
 		ftrace_disable_ftrace_graph_caller();
+}
+
+static int __ftrace_modify_code(void *data)
+{
+	int *command = data;
+
+	ftrace_modify_all_code(*command);
 
 	return 0;
 }