diff --git a/kernel/sys.c b/kernel/sys.c
index 071de90..b882440 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -362,11 +362,6 @@
 }
 EXPORT_SYMBOL(unregister_reboot_notifier);
 
-/* Add backwards compatibility for stable trees. */
-#ifndef PF_NO_SETAFFINITY
-#define PF_NO_SETAFFINITY		PF_THREAD_BOUND
-#endif
-
 static void migrate_to_reboot_cpu(void)
 {
 	/* The boot cpu is always logical cpu 0 */