From: "Paul E. McKenney" <paulmck@kernel.org>
To: madhuparnabhowmik04@gmail.com
Cc: joel@joelfernandes.org, rcu@vger.kernel.org,
linux-kernel-mentees@lists.linuxfoundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH] rculist.h: Add list_tail_rcu()
Date: Mon, 9 Dec 2019 10:33:13 -0800 [thread overview]
Message-ID: <20191209183313.GL2889@paulmck-ThinkPad-P72> (raw)
In-Reply-To: <20191209075043.17947-1-madhuparnabhowmik04@gmail.com>
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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next prev parent reply other threads:[~2019-12-09 18:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 7:50 [Linux-kernel-mentees] [PATCH] rculist.h: Add list_tail_rcu() madhuparnabhowmik04
2019-12-09 18:33 ` Paul E. McKenney [this message]
2019-12-09 19:30 ` Madhuparna Bhowmik
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