1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index a52703864a16..82801fd2e931 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -409,6 +409,8 @@ END(save_paranoid)
 ENTRY(ret_from_fork)
         DEFAULT_FRAME
 
+        LOCK ; btr $TIF_FORK,TI_flags(%r8)
+
         push kernel_eflags(%rip)
         CFI_ADJUST_CFA_OFFSET 8
         popf                                    # reset kernel eflags