compat_robust_list
struct compat_robust_list list;
struct compat_robust_list_head __user *compat_robust_list;
struct compat_robust_list_head __user *head = current->futex.compat_robust_list;
struct compat_robust_list_head __user *head = current->futex.compat_robust_list;
current->futex.compat_robust_list = NULL;
if (unlikely(tsk->futex.compat_robust_list)) {
tsk->futex.compat_robust_list = NULL;
return p->futex.compat_robust_list;
current->futex.compat_robust_list = head;