linux-kernel - Re: [PATCH 1/3] rbtree: Introduce rb_for_each

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Date:	Wed, 13 Jan 2010 14:16:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 1/3] rbtree: Introduce rb_for_each_entry

On Wed, 2010-01-13 at 11:01 -0200, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> Similar to list_for_each_entry, helps reducing boilerplate in many
> places and makes rbtrees closer to list.h macros.
> 
> First conversion will be in the tools/perf.

I'm still not sure you really want to do this, it might give people the
impression its a sane thing to do ;-)

> Cc: Frédéric Weisbecker <fweisbec@...il.com>
> Cc: Mike Galbraith <efault@....de>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Paul Mackerras <paulus@...ba.org>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  include/linux/rbtree.h |   12 ++++++++++++
>  1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
> index 9c29541..044b150 100644
> --- a/include/linux/rbtree.h
> +++ b/include/linux/rbtree.h
> @@ -158,4 +158,16 @@ static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
>  	*rb_link = node;
>  }
>  
> +/**
> + * rb_for_each_entry - iterate over rbtree of given type
> + * @pos:	the type * to hold the current entry being traversed
> + * @node:	the rb_node to hold the current entry being traversed
> + * @root:	the root for your tree.
> + * @member:	the name of the rb_node within the struct.
> + */
> +#define rb_for_each_entry(pos, node, root, member)			\
> +	for (node = rb_first(root);					\
> +	     node && (pos = rb_entry(node, typeof(*pos), member));	\
> +	     node = rb_next(node))
> +
>  #endif	/* _LINUX_RBTREE_H */


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