Merge branch 'tip/x86/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace

Conflicts:
	include/linux/ftrace.h
	kernel/trace/ftrace.c

1 files changed, 32 insertions, 1 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index cf59f4c54745..5a3a06b21eee 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -557,8 +557,11 @@ static void ftrace_replace_code(int enable)
                         if ((system_state == SYSTEM_BOOTING) ||
                             !core_kernel_text(rec->ip)) {
                                 ftrace_free_rec(rec);
-                        } else
+                                } else {
                                 ftrace_bug(failed, rec->ip);
+                                        /* Stop processing */
+                                        return;
+                                }
                 }
         } while_for_each_ftrace_rec();
 }
@@ -580,6 +583,24 @@ ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)
         return 1;
 }
 
+/*
+ * archs can override this function if they must do something
+ * before the modifying code is performed.
+ */
+int __weak ftrace_arch_code_modify_prepare(void)
+{
+        return 0;
+}
+
+/*
+ * archs can override this function if they must do something
+ * after the modifying code is performed.
+ */
+int __weak ftrace_arch_code_modify_post_process(void)
+{
+        return 0;
+}
+
 static int __ftrace_modify_code(void *data)
 {
         int *command = data;
@@ -602,7 +623,17 @@ static int __ftrace_modify_code(void *data)
 
 static void ftrace_run_update_code(int command)
 {
+        int ret;
+
+        ret = ftrace_arch_code_modify_prepare();
+        FTRACE_WARN_ON(ret);
+        if (ret)
+                return;
+
         stop_machine(__ftrace_modify_code, &command, NULL);
+
+        ret = ftrace_arch_code_modify_post_process();
+        FTRACE_WARN_ON(ret);
 }
 
 static ftrace_func_t saved_ftrace_func;