[Linux-kernel-mentees] [PATCH] rculist.h: Add list_tail_rcu()

[Linux-kernel-mentees] [PATCH] rculist.h: Add list_tail_rcu()

[madhuparnabhowmik04]

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

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Re: [Linux-kernel-mentees] [PATCH] rculist.h: Add list_tail_rcu()

[Paul E. McKenney]

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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Re: [Linux-kernel-mentees] [PATCH] rculist.h: Add list_tail_rcu()

[Madhuparna Bhowmik]

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On Tue, Dec 10, 2019 at 12:03 AM Paul E. McKenney <paulmck@kernel.org>
wrote:

> 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!
>
> Thank you!

Regards,
Madhuparna

>                                                         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
> >
>
ᐧ

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