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Message-ID: <25610.1270579965@redhat.com>
Date:	Tue, 06 Apr 2010 19:52:45 +0100
From:	David Howells <dhowells@...hat.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	dhowells@...hat.com, paulmck@...ux.vnet.ibm.com, corbet@....net,
	linux-kernel@...r.kernel.org, linux-cachefs@...hat.com
Subject: Re: An incorrect assumption over radix_tree_tag_get()

Nick Piggin <npiggin@...e.de> wrote:

> It is safe. Synchronization requirements for using the radix tree API
> are documented.

I presume you mean the big comment on it in radix-tree.h.

According to that, it is not safe:

 * - any function _modifying_ the tree or tags (inserting or deleting
 *   items, setting or clearing tags) must exclude other modifications, and
 *   exclude any functions reading the tree.
 
David
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