linux-kernel - Re: [PATCH tip/core/urgent 1/4] rcu: add rcu_access_pointer and rcu_dereference

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Message-ID: <20100412205244.GE2525@linux.vnet.ibm.com>
Date:	Mon, 12 Apr 2010 13:52:44 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Josh Triplett <josh@...htriplett.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Howells <dhowells@...hat.com>,
	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
Subject: Re: [PATCH tip/core/urgent 1/4] rcu: add rcu_access_pointer and
 rcu_dereference_protected

On Mon, Apr 12, 2010 at 10:30:42PM +0200, Arnd Bergmann wrote:
> On Monday 12 April 2010 21:24:42 Josh Triplett wrote:
> > If you want to prevent people from deferencing the pointer directly, or
> > from assigning it to some other pointer, you could use Sparse's
> > __attribute__((noderef)) and
> > __attribute__((address_space(...)).
> > 
> > See the definitions of __user and __iomem in include/linux/compiler.h
> > for instance.  (And, looking at that file, now __percpu.  Nice!)
> > 
> > You'd then have to explicitly use __force at the point where you
> > legitimately dereference it.
> 
> I have started a patch set for doing that a few weeks ago, still need
> to pick up that work again. Are there any other patches besides this
> series that I should base on top of now?

Very good, Arnd!!!  Looking forward to seeing the updated patchset!!!

My suggestion would be to take the current tip/core/urgent, apply
this patch set, and start from there.

						Thanx, Paul
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