On Mon, Dec 09, 2019 at 01:20:43PM +0530, madhuparnabhowmik04@xxxxxxxxx wrote: > From: Madhuparna Bhowmik <madhuparnabhowmik04@xxxxxxxxx> > > This patch adds the macro list_tail_rcu() and document it. > > Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@xxxxxxxxx> Queued with slight edits, thank you very much! Thanx, Paul > --- > include/linux/rculist.h | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/include/linux/rculist.h b/include/linux/rculist.h > index 4b7ae1bf50b3..9f21efa525ab 100644 > --- a/include/linux/rculist.h > +++ b/include/linux/rculist.h > @@ -40,6 +40,16 @@ static inline void INIT_LIST_HEAD_RCU(struct list_head *list) > */ > #define list_next_rcu(list) (*((struct list_head __rcu **)(&(list)->next))) > > +/** > + * list_tail_rcu - returns the prev pointer of the head of the list > + * @head: the head of the list > + * > + * Note: This should only be used with the list header, > + * but only if list_del() and similar primitives are not > + * also used on the list header. > + */ > +#define list_tail_rcu(head) (*((struct list_head __rcu **)(&(head)->prev))) > + > /* > * Check during list traversal that we are within an RCU reader > */ > -- > 2.17.1 >
