linux-kernel - Re: [PATCH 2/5] rbtree: add rbtree_postorder_for_each_entry

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Message-ID: <20130729150624.GB4381@variantweb.net>
Date:	Mon, 29 Jul 2013 10:06:24 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH 2/5] rbtree: add rbtree_postorder_for_each_entry_safe()
 helper

On Fri, Jul 26, 2013 at 02:13:40PM -0700, Cody P Schafer wrote:
> Because deletion (of the entire tree) is a relatively common use of the
> rbtree_postorder iteration, and because doing it safely means fiddling
> with temporary storage, provide a helper to simplify postorder rbtree
> iteration.
> 
> Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
> ---
>  include/linux/rbtree.h | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
> index 2879e96..64ab98b 100644
> --- a/include/linux/rbtree.h
> +++ b/include/linux/rbtree.h
> @@ -85,4 +85,21 @@ static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
>  	*rb_link = node;
>  }
> 
> +/**
> + * rbtree_postorder_for_each_entry_safe - iterate over rb_root in post order of
> + * given type safe against removal of rb_node entry
> + *
> + * @pos:	the 'type *' to use as a loop cursor.
> + * @n:		another 'type *' to use as temporary storage
> + * @root:	'rb_root *' of the rbtree.
> + * @field:	the name of the rb_node field within 'type'.
> + */
> +#define rbtree_postorder_for_each_entry_safe(pos, n, root, field) \
> +	for (pos = rb_entry(rb_first_postorder(root), typeof(*pos), field),\
> +	      n = rb_entry(rb_next_postorder(&pos->field), \
> +		      typeof(*pos), field); \
> +	     &pos->field; \
> +	     pos = n, \
> +	      n = rb_entry(rb_next_postorder(&pos->field), typeof(*pos), field))

One too many spaces.  Also mix of tabs and spaces is weird, but
checkpatch doesn't complain so...

Seth

> +
>  #endif	/* _LINUX_RBTREE_H */
> -- 
> 1.8.3.4
> 

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