linux-kernel - Re: [PATCH v2 2.6.38-rc8-tip 7/20] 7: uprobes: store/restore original instruction.

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Message-ID: <1300217432.2250.0.camel@laptop>
Date:	Tue, 15 Mar 2011 20:30:32 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	balbir@...ux.vnet.ibm.com
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Stephen Wilson <wilsons@...rt.ca>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	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>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	SystemTap <systemtap@...rces.redhat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 2.6.38-rc8-tip 7/20]  7: uprobes: store/restore
 original instruction.

On Wed, 2011-03-16 at 00:28 +0530, Balbir Singh wrote:
> 
> mm->owner should be under rcu_read_lock, unless the task is exiting
> and mm_count is 1. mm->owner is updated under task_lock().
> 
> > Also, the assignments in kernel/fork.c and kernel/exit.c don't use
> > rcu_assign_pointer() and therefore lack the needed write barrier.
> >
> 
> Those are paths when the only context using the mm->owner is single
>  
> > Git blames Balbir for this.
> 
> I accept the blame and am willing to fix anything incorrect found in
> the code. 

:-), ok sounds right, just wasn't entirely obvious when having a quick
look.

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