From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [RFC,PATCH 14/35] svc: Change sk_inuse to a kref
Date: Wed, 3 Oct 2007 16:15:25 +0100
Message-ID: <20071003151525.GA32010@infradead.org>
References: <20071001191426.3250.15371.stgit@dell3.ogc.int>
	<20071001192801.3250.49751.stgit@dell3.ogc.int>
	<20071003111210.GA19381@infradead.org>
	<20071003144517.GA10001@fieldses.org>
	<20071003145238.GA30564@infradead.org>
	<20071003151139.GB10001@fieldses.org>
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Cc: Christoph Hellwig <hch@infradead.org>, neilb@suse.de,
	nfs@lists.sourceforge.net, gnb@sgi.com
To: "J. Bruce Fields" <bfields@fieldses.org>
In-Reply-To: <20071003151139.GB10001@fieldses.org>
Sender: nfs-bounces@lists.sourceforge.net
Errors-To: nfs-bounces@lists.sourceforge.net

On Wed, Oct 03, 2007 at 11:11:39AM -0400, J. Bruce Fields wrote:
> OK, but why are they a complete pain in the ass, and which hard-to-avoid
> races are you thinking of?  Is that documented somewhere?

They lack a primitive equivalent to atomic_dec_and_test which is required
if you need the lock to prevent it going up from zero again.  There have
been various lkml threads on this.

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