On Mon, Aug 21, 2023 at 02:44:28PM +0100, Matthew Wilcox (Oracle) wrote: > list_for_each_entry_rcu() takes an optional fourth argument which > allows RCU to assert that the correct lock is held. Several callers > of for_each_thread() rely on their caller to be holding the appropriate > lock, so this is a useful assertion to include. > > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Reviewed-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx> thanks, - Joel > --- > include/linux/sched/signal.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h > index 669e8cff40c7..f1eae7f53be9 100644 > --- a/include/linux/sched/signal.h > +++ b/include/linux/sched/signal.h > @@ -659,7 +659,8 @@ extern bool current_is_single_threaded(void); > while ((t = next_thread(t)) != g) > > #define __for_each_thread(signal, t) \ > - list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node) > + list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node, \ > + lockdep_is_held(&tasklist_lock)) > > #define for_each_thread(p, t) \ > __for_each_thread((p)->signal, t) > -- > 2.40.1 >
