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-rw-r--r--arch/x86/kernel/ftrace.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 33786044d5ac..d7e93b2783fd 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -36,6 +36,11 @@
int ftrace_arch_code_modify_prepare(void)
{
+ /*
+ * Need to grab text_mutex to prevent a race from module loading
+ * and live kernel patching from changing the text permissions while
+ * ftrace has it set to "read/write".
+ */
mutex_lock(&text_mutex);
set_kernel_text_rw();
set_all_modules_text_rw();