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Date: Mon, 02 Dec 2013 17:24:22 -0500
From: Rik van Riel <riel@redhat.com>
MIME-Version: 1.0
Subject: Re: [patch 2/9] lib: radix-tree: radix_tree_delete_item()
References: <1386012108-21006-1-git-send-email-hannes@cmpxchg.org> <1386012108-21006-3-git-send-email-hannes@cmpxchg.org>
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To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, Andi Kleen <andi@firstfloor.org>, Andrea Arcangeli <aarcange@redhat.com>, Christoph Hellwig <hch@infradead.org>, Dave Chinner <david@fromorbit.com>, Greg Thelen <gthelen@google.com>, Hugh Dickins <hughd@google.com>, Jan Kara <jack@suse.cz>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Mel Gorman <mgorman@suse.de>, Metin Doslu <metin@citusdata.com>, Michel Lespinasse <walken@google.com>, Minchan Kim <minchan.kim@gmail.com>, Ozgun Erdogan <ozgun@citusdata.com>, Peter Zijlstra <peterz@infradead.org>, Roman Gushchin <klamm@yandex-team.ru>, Ryan Mallon <rmallon@gmail.com>, Tejun Heo <tj@kernel.org>, Vlastimil Babka <vbabka@suse.cz>, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org

On 12/02/2013 02:21 PM, Johannes Weiner 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.
> 
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
> Reviewed-by: Minchan Kim <minchan@kernel.org>

Reviewed-by: Rik van Riel <riel@redhat.com>

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