linux-kernel - Re: [patch 0/9] Fix various __task_cred related invalid RCU assumptions

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Date:	Sun, 13 Dec 2009 19:56:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>, Oleg Nesterov <oleg@...sign.ru>,
	Al Viro <viro@...iv.linux.org.uk>,
	James Morris <jmorris@...ei.org>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 0/9] Fix various __task_cred related invalid RCU
 assumptions

On Wed, 2009-12-09 at 21:34 -0800, Paul E. McKenney wrote:

> Ah -- I have a related lockdep question.  Is there a primitive that says
> whether or not the current task holds at least one lock of any type?
> If so, I would like to make rcu_dereference() do at least a little crude
> checking for this problem.

Hmm, no, but that's not hard to do, however I actually implemented
something like that for RCU a long while ago and that gives a metric TON
of false positives due to things like the radix tree which are RCU-safe
but are not required to be used with RCU.


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