linux-kernel - Re: [PATCH] cred - synchronize rcu before releasing cred

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Message-ID: <32758.1280321226@redhat.com>
Date:	Wed, 28 Jul 2010 13:47:06 +0100
From:	David Howells <dhowells@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Olsa <jolsa@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	dhowells@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] cred - synchronize rcu before releasing cred

David Howells <dhowells@...hat.com> wrote:

> Yeah.  I think there are three alternatives:

There's a fourth alternative too:

 (4) I could try and make it so that if the RCU cleanup routine sees it with a
     non-zero usage count, then it just ignores it.  This, however, would
     require call_rcu() to be able to cope with requeueing.

David
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