Merge pull request #55 from toradex/4.14-2.0.x-imx

4.14 2.0.x imx

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index c020ba4b7eb6..ccc2b9d2956a 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/memory.h>
 
 #include <trace/syscall.h>
 
@@ -36,6 +37,7 @@
 
 int ftrace_arch_code_modify_prepare(void)
 {
+	mutex_lock(&text_mutex);
 	set_kernel_text_rw();
 	set_all_modules_text_rw();
 	return 0;
@@ -45,6 +47,7 @@ int ftrace_arch_code_modify_post_process(void)
 {
 	set_all_modules_text_ro();
 	set_kernel_text_ro();
+	mutex_unlock(&text_mutex);
 	return 0;
 }