* [PATCH] rculist.h: Add list_tail_rcu()
@ 2019-12-09 7:50 madhuparnabhowmik04
2019-12-09 18:33 ` Paul E. McKenney
0 siblings, 1 reply; 2+ messages in thread
From: madhuparnabhowmik04 @ 2019-12-09 7:50 UTC (permalink / raw)
To: paulmck, joel; +Cc: rcu, linux-kernel, linux-kernel-mentees, Madhuparna Bhowmik
From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
This patch adds the macro list_tail_rcu() and document it.
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
---
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] rculist.h: Add list_tail_rcu()
2019-12-09 7:50 [PATCH] rculist.h: Add list_tail_rcu() madhuparnabhowmik04
@ 2019-12-09 18:33 ` Paul E. McKenney
0 siblings, 0 replies; 2+ messages in thread
From: Paul E. McKenney @ 2019-12-09 18:33 UTC (permalink / raw)
To: madhuparnabhowmik04; +Cc: joel, rcu, linux-kernel, linux-kernel-mentees
On Mon, Dec 09, 2019 at 01:20:43PM +0530, madhuparnabhowmik04@gmail.com wrote:
> From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
>
> This patch adds the macro list_tail_rcu() and document it.
>
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
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
>
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2019-12-09 7:50 [PATCH] rculist.h: Add list_tail_rcu() madhuparnabhowmik04
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