LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Franck Bui-Huu <vagabon.xyz@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] rculist.h: use the rcu API
Date: Thu, 17 Jan 2008 21:55:29 -0800	[thread overview]
Message-ID: <20080118055529.GE8477@linux.vnet.ibm.com> (raw)
In-Reply-To: <478FBF19.1090009@gmail.com>

On Thu, Jan 17, 2008 at 09:48:25PM +0100, Franck Bui-Huu wrote:
> From: Franck Bui-Huu <fbuihuu@gmail.com>
> 
> This patch makes almost all list mutation primitives use
> rcu_assign_pointer().
> 
> The main point of this being readability improvement.

Looks better to me!

Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

> Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
> ---
>  include/linux/rculist.h |   23 +++++++++--------------
>  1 files changed, 9 insertions(+), 14 deletions(-)
> 
> diff --git a/include/linux/rculist.h b/include/linux/rculist.h
> index 8056d38..038b64f 100644
> --- a/include/linux/rculist.h
> +++ b/include/linux/rculist.h
> @@ -7,6 +7,7 @@
>   * RCU-protected list version
>   */
>  #include <linux/list.h>
> +#include <linux/rcupdate.h>
> 
>  /*
>   * Insert a new entry between two known consecutive entries.
> @@ -19,9 +20,8 @@ static inline void __list_add_rcu(struct list_head * new,
>  {
>  	new->next = next;
>  	new->prev = prev;
> -	smp_wmb();
> +	rcu_assign_pointer(prev->next, new);
>  	next->prev = new;
> -	prev->next = new;
>  }
> 
>  /**
> @@ -110,9 +110,8 @@ static inline void list_replace_rcu(struct list_head *old,
>  {
>  	new->next = old->next;
>  	new->prev = old->prev;
> -	smp_wmb();
> +	rcu_assign_pointer(new->prev->next, new);
>  	new->next->prev = new;
> -	new->prev->next = new;
>  	old->prev = LIST_POISON2;
>  }
> 
> @@ -166,8 +165,7 @@ static inline void list_splice_init_rcu(struct list_head *list,
>  	 */
> 
>  	last->next = at;
> -	smp_wmb();
> -	head->next = first;
> +	rcu_assign_pointer(head->next, first);
>  	first->prev = head;
>  	at->prev = last;
>  }
> @@ -280,10 +278,9 @@ static inline void hlist_replace_rcu(struct hlist_node *old,
> 
>  	new->next = next;
>  	new->pprev = old->pprev;
> -	smp_wmb();
> +	rcu_assign_pointer(*new->pprev, new);
>  	if (next)
>  		new->next->pprev = &new->next;
> -	*new->pprev = new;
>  	old->pprev = LIST_POISON2;
>  }
> 
> @@ -310,12 +307,12 @@ static inline void hlist_add_head_rcu(struct hlist_node *n,
>  					struct hlist_head *h)
>  {
>  	struct hlist_node *first = h->first;
> +
>  	n->next = first;
>  	n->pprev = &h->first;
> -	smp_wmb();
> +	rcu_assign_pointer(h->first, n);
>  	if (first)
>  		first->pprev = &n->next;
> -	h->first = n;
>  }
> 
>  /**
> @@ -341,9 +338,8 @@ static inline void hlist_add_before_rcu(struct hlist_node *n,
>  {
>  	n->pprev = next->pprev;
>  	n->next = next;
> -	smp_wmb();
> +	rcu_assign_pointer(*(n->pprev), n);
>  	next->pprev = &n->next;
> -	*(n->pprev) = n;
>  }
> 
>  /**
> @@ -369,8 +365,7 @@ static inline void hlist_add_after_rcu(struct hlist_node *prev,
>  {
>  	n->next = prev->next;
>  	n->pprev = &prev->next;
> -	smp_wmb();
> -	prev->next = n;
> +	rcu_assign_pointer(prev->next, n);
>  	if (n->next)
>  		n->next->pprev = &n->next;
>  }
> -- 
> 1.5.3.7
> 

  reply	other threads:[~2008-01-18  5:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-17 20:46 [PATCH 0/2] Make RCU lists use the RCU API Franck Bui-Huu
2008-01-17 20:47 ` [PATCH 1/2] Split list.h and move rcu-protected lists into rculist.h Franck Bui-Huu
2008-02-01 23:58   ` Andrew Morton
2008-02-02 13:32     ` Franck Bui-Huu
2008-02-02 19:15       ` Andrew Morton
2008-02-03  8:45         ` Franck Bui-Huu
2008-02-03  9:00           ` Andrew Morton
2008-02-03  9:11             ` Franck Bui-Huu
2008-01-17 20:48 ` [PATCH 2/2] rculist.h: use the rcu API Franck Bui-Huu
2008-01-18  5:55   ` Paul E. McKenney [this message]
     [not found] <47BAC1E6.2050901@gmail.com>
2008-02-19 11:51 ` Franck Bui-Huu
2008-05-14 21:24 [PATCH 1/2] Split list.h and move rcu-protected lists into rculist.h Franck Bui-Huu
2008-05-14 21:26 ` [PATCH 2/2] rculist.h: use the rcu API Franck Bui-Huu
2008-05-15  5:50   ` Alexey Dobriyan
2008-05-15 14:48     ` Paul E. McKenney

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20080118055529.GE8477@linux.vnet.ibm.com \
    --to=paulmck@linux.vnet.ibm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=vagabon.xyz@gmail.com \
    --subject='Re: [PATCH 2/2] rculist.h: use the rcu API' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).