linux-kernel - Re: [patch 1/9] lib: radix-tree: radix_tree_delete

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Date:	Tue, 20 Aug 2013 13:59:03 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Greg Thelen <gthelen@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Ozgun Erdogan <ozgun@...usdata.com>,
	Metin Doslu <metin@...usdata.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/9] lib: radix-tree: radix_tree_delete_item()

On Sat, 17 Aug 2013 15:31:15 -0400 Johannes Weiner <hannes@...xchg.org> wrote:

> Provide a function that does not just delete an entry at a given
> index, but also allows passing in an expected item.  Delete only if
> that item is still located at the specified index.
> 
> This is handy when lockless tree traversals want to delete entries as
> well because they don't have to do an second, locked lookup to verify
> the slot has not changed under them before deleting the entry.
> 
> ...
>
> -void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
> +void *radix_tree_delete_item(struct radix_tree_root *root,
> +			     unsigned long index, void *item)

radix-tree is an exported-to-modules API, so I guess we should do this
so others don't need to..

--- a/lib/radix-tree.c~lib-radix-tree-radix_tree_delete_item-fix
+++ a/lib/radix-tree.c
@@ -1393,6 +1393,7 @@ void *radix_tree_delete_item(struct radi
 out:
 	return slot;
 }
+EXPORT_SYMBOL(radix_tree_delete_item);
 
 /**
  *	radix_tree_delete    -    delete an item from a radix tree
_

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