linux-kernel - Re: 2.6.23-rc6-mm1: IPC: sleeping function called ...

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Message-ID: <20070918182924.GF8665@linux.vnet.ibm.com>
Date:	Tue, 18 Sep 2007 11:29:24 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Nadia Derbey <Nadia.Derbey@...l.net>,
	Alexey Dobriyan <adobriyan@...ru>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.23-rc6-mm1: IPC: sleeping function called ...

On Tue, Sep 18, 2007 at 09:57:15AM -0700, Andrew Morton wrote:
> On Tue, 18 Sep 2007 09:13:37 -0700 "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > On Tue, Sep 18, 2007 at 02:24:51PM +0200, Peter Zijlstra wrote:
> > > On Tue, 18 Sep 2007 03:34:00 -0700 Andrew Morton
> > > <akpm@...ux-foundation.org> wrote:
> > > 
> > > > Well, it was an optimisation.  spin_lock() implies rcu_read_lock().  That's
> > > > a bit dirty and we might choose to not do that.
> > > 
> > > Not true for the preemptible-rcu work. All such sites should be fixed,
> > > or at the very least heavily annotated.
> > 
> > What he said!!!
> > 
> 
> What he said!
> 
> How are you going to find all such sites?

A first step would be to look for patches in -rt that add rcu_read_lock()
or friends.  A second step would be to look for rcu_dereference() without
an enclosing rcu_read_lock(), rcu_read_lock_bh(), or preempt_disable().

Beyond a certain point, this reduces to the problem of finding places
where spin_lock() was omitted, right?

							Thanx, Paul
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