linux-kernel - Re: [PATCH tip/core/rcu 8/9] idr: apply lockdep-based diagnostics to rcu

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Message-ID: <20100119005646.GA6196@linux.vnet.ibm.com>
Date:	Mon, 18 Jan 2010 16:56:46 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com
Subject: Re: [PATCH tip/core/rcu 8/9] idr: apply lockdep-based diagnostics
	to rcu_dereference() uses

On Mon, Jan 18, 2010 at 03:36:04PM -0800, Josh Triplett wrote:
> On Thu, Jan 14, 2010 at 05:02:45PM -0800, Paul E. McKenney wrote:
> > From: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > Because idr can be used with any of a number of locks or with any
> > flavor of RCU, just disable the lockdep-based diagnostics.  If idr
> > needs diagnostics, the check expression will need to be passed into
> > the relevant idr primitives as an additional argument.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> The subject line of this patch seems wrong.  Like the preceding patches
> for radix tree and list operations, this *disables* the checking by
> using _raw.

It does indeed use _raw.  If we start having enough issues with these
interfaces, this will need to change.  At the moment, the obvious change
is to provide multiple interfaces as was done for rcu_dereference().
For example, idr_find(), idr_find_bh(), idr_find_sched(), idr_find_srcu(),
idr_find_rcu(), and idr_find_check().

Probably only a few of these are actually in use, but even so, I decided
to see how rcu_dereference() turned out before pushing up to the
higher-level APIs.  My guess would be that the list APIs would be most
pressing, but we will see.  ;-)

							Thanx, Paul
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