linux-kernel - Re: [PATCH v4 3.0-rc2-tip 4/22] 4: Uprobes: register/unregister probes.

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Message-ID: <1307983819.9218.78.camel@gandalf.stny.rr.com>
Date:	Mon, 13 Jun 2011 12:50:19 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 4/22]  4: Uprobes: register/unregister
 probes.

On Fri, 2011-06-10 at 01:03 +0200, Peter Zijlstra wrote:

> The comment in del_consumer() that says: 'drop creation ref' worries me
> and makes me thing that is the last reference around and the uprobe will
> be freed right there, which clearly cannot happen since its not yet
> removed from the RB-tree.

I agree about that comment. It scared me too, not only about the RB
tree, but the uprobe is used later in that function to drop the
write_rwsem.

I think that comment needs to be changed to something like:

/* Have caller drop the creation ref */

-- Steve


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